CN113384260B

CN113384260B - Acceleration factor adjusting method, magnetic resonance imaging scanning method, device and equipment

Info

Publication number: CN113384260B
Application number: CN202010174617.0A
Authority: CN
Inventors: 李国斌
Original assignee: Shanghai United Imaging Healthcare Co Ltd
Current assignee: Shanghai United Imaging Healthcare Co Ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2023-04-25
Anticipated expiration: 2040-03-13
Also published as: CN113384260A

Abstract

The application relates to an acceleration factor adjusting method, a magnetic resonance imaging scanning method, a device and equipment. The method comprises the following steps: acquiring an adjustment parameter, wherein the adjustment parameter comprises at least one of a tissue type, a size proportion of a region to be detected, a radio frequency receiving coil parameter and a scanning protocol parameter, the size proportion is used for representing the size proportion of the region to be detected in a scanning range along a phase encoding direction, the radio frequency receiving coil parameter is a parameter representing the performance of the radio frequency receiving coil, and the scanning protocol parameter is a parameter representing the characteristic of a scanning protocol; and adjusting an acceleration factor according to the adjustment parameter. The method provided by the application can only regulate the acceleration factor.

Description

Acceleration factor adjusting method, magnetic resonance imaging scanning method, device and equipment

Technical Field

The present disclosure relates to the field of magnetic resonance technologies, and in particular, to a method for adjusting an acceleration factor, a method, an apparatus, and a device for scanning magnetic resonance imaging.

Background

Magnetic resonance imaging (Magnetic Resonance Imaging, MRI), known as spin imaging (NMRI), is known under the full name of magnetic resonance imaging (Nuclear Magnetic Resonance Imaging). The magnetic resonance imaging is a diagnosis technology for reconstructing an image of a certain layer of a human body by processing the obtained radio frequency signals through an electronic computer by utilizing nuclear magnetic resonance phenomenon of a certain atomic nucleus in human body tissues.

In magnetic resonance imaging, acquisition time is an important parameter. On the premise of ensuring the acquisition quality, the acquisition time is shortened, so that the efficiency of magnetic resonance imaging can be improved, the acceleration of magnetic resonance is realized, and in practical application, the success rate of examination can be improved. For example, in liver imaging, shortening the acquisition time can shorten the patient breath-hold time during the examination, thereby improving the success rate. Therefore, in magnetic resonance imaging, adjustment of the sampling time is important.

There are many methods of adjusting the sampling time, and in many acceleration techniques, the acquisition time is shortened by reducing the amount of K-space data acquired, i.e., by undersampling (undersampling). In the undersampling technology, an acceleration factor is an important parameter, and the adjustment of sampling time can be realized by adjusting the acceleration factor. The acceleration factor refers to the ratio of the amount of full sampled data to the amount of actual sampled data in the undersampling technique.

In the related art, the acceleration factor is adjusted manually by a technician, so that the intelligent problem is solved.

Disclosure of Invention

Based on the foregoing, it is necessary to provide an acceleration factor adjusting method, a magnetic resonance imaging scanning method, a device and equipment.

A method of acceleration factor adjustment, the method comprising:

acquiring an adjustment parameter, wherein the adjustment parameter comprises at least one of a tissue type, a size proportion of a region to be detected, a radio frequency receiving coil parameter and a scanning protocol parameter, the size proportion is used for representing the size proportion of the region to be detected in a scanning range along a phase encoding direction, the radio frequency receiving coil parameter is a parameter representing the performance of the radio frequency receiving coil, and the scanning protocol parameter is a parameter representing the characteristic of a scanning protocol;

and adjusting an acceleration factor according to the adjustment parameter.

In one embodiment, the imaging scan of the area to be detected is a two-dimensional scan, the adjustment parameter is a size ratio, and the acquiring the adjustment parameter includes:

acquiring the length of the projection of the region to be detected along the phase encoding direction, and obtaining the length of the region to be detected;

acquiring the length of the scanning range along the phase coding direction to obtain the length of the scanning range;

and calculating the ratio of the length of the region to be detected to the length of the scanning range to obtain the size ratio.

In one embodiment, the imaging scan of the area to be detected is a three-dimensional scan, the adjustment parameter is a size ratio, and the acquiring the adjustment parameter includes:

Acquiring the area of the region to be detected;

acquiring the area of the scanning range;

and calculating the ratio of the area to be detected to the area of the scanning range to obtain the size ratio.

In one embodiment, the adjusting the acceleration factor according to the adjustment parameter includes:

and adjusting the acceleration factor according to the size proportion, wherein the larger the size proportion is, the smaller the acceleration factor is.

In one embodiment, said adjusting said acceleration factor according to said size ratio comprises:

if the size ratio is greater than 0.5, adjusting the acceleration factor to 2.0;

and if the size ratio is less than or equal to 0.5, adjusting the acceleration factor to be the inverse of the size ratio.

In one embodiment, the adjustment parameter is the radio frequency receiving coil parameter, and the adjustment parameter includes at least one of a coil unit number, a target spatial coil distribution parameter, and a coil sensitivity, where the target spatial coil distribution parameter is used to characterize a number and a position parameter of radio frequency receiving coils distributed in a preset spatial range of the region to be detected.

And adjusting the acceleration factor according to the radio frequency receiving coil parameters, wherein the larger the number of the coil units is, the larger the acceleration factor is, the larger the target space coil distribution parameters are, the larger the acceleration factor is, the higher the coil sensitivity is, and the larger the acceleration factor is.

In one embodiment, the adjustment parameter is the tissue type and/or the scan protocol parameter, and the adjusting the acceleration factor according to the adjustment parameter includes:

determining a preset target acceleration factor corresponding to the tissue type and/or the scanning protocol parameter;

and adjusting the acceleration factor to the preset target acceleration factor.

determining an acceleration factor according to the size proportion to obtain a first acceleration factor;

determining an acceleration factor according to the radio frequency receiving coil parameters to obtain a second acceleration factor;

determining an acceleration factor according to the tissue type and the scanning protocol parameter to obtain a third acceleration factor;

obtaining a final acceleration factor according to the first acceleration factor, the second acceleration factor and the third acceleration factor;

And adjusting the acceleration factor to be the final acceleration factor.

In one embodiment, the obtaining the final acceleration factor according to the first acceleration factor, the second acceleration factor, and the third acceleration factor includes:

and calculating the product of the first acceleration factor, the second acceleration factor and the third acceleration factor to obtain the final acceleration factor.

A magnetic resonance imaging scanning method, comprising:

providing an initial scanning protocol, and determining a scanning range through the initial scanning protocol, wherein the scanning range extends along a phase encoding direction;

acquiring a contour image of a region to be detected in a scanned object;

determining the size proportion of the contour image in the scanning range along the phase encoding direction;

setting an acceleration factor in the initial scanning protocol according to the size proportion to generate a target scanning protocol;

and executing the target scanning protocol to perform magnetic resonance imaging scanning on the region to be detected.

An acceleration factor adjusting apparatus, the apparatus comprising:

the device comprises a parameter acquisition module, a scanning protocol parameter acquisition module and a scanning protocol parameter acquisition module, wherein the parameter acquisition module is used for acquiring adjustment parameters, the adjustment parameters comprise at least one of a tissue type, a size proportion of a region to be detected, a radio frequency receiving coil parameter and a scanning protocol parameter, the size proportion is used for representing the proportion of the size of the region to be detected to the size of a scanning range along a phase encoding direction, the radio frequency receiving coil parameter refers to a parameter representing the performance of the radio frequency receiving coil, and the scanning protocol parameter refers to a parameter representing the characteristic of the scanning protocol;

And the adjusting module is used for adjusting the acceleration factor according to the adjusting parameter.

A magnetic resonance imaging scanning apparatus, the apparatus comprising:

the initial protocol acquisition module is used for providing an initial scanning protocol, determining a scanning range through the initial scanning protocol, and extending the phase encoding direction of the scanning range;

the contour image acquisition module is used for acquiring a contour image of a region to be detected in the scanned object;

the size proportion determining module is used for determining the size proportion of the contour image in the scanning range along the phase encoding direction;

the target protocol generation module is used for setting an acceleration factor in the initial scanning protocol according to the size proportion so as to generate a target scanning protocol;

and the scanning module is used for executing the target scanning protocol so as to perform magnetic resonance imaging scanning on the region to be detected.

A magnetic resonance imaging scanning apparatus comprising:

a magnetic resonance scanner disposed within the scan room, the magnetic resonance scanner having a scan cavity;

a scanning bed for supporting a test object, and the scanning bed being drivable to move the test object into or out of the scanning chamber;

A memory storing a computer program, and a processor arranged within or outside the scan room, the processor implementing when executing the computer program:

providing an initial scanning protocol, and controlling the magnetic resonance scanner to determine the scanning range of the scanning cavity through the initial scanning protocol, wherein the scanning range extends along the phase encoding direction;

acquiring a contour image of a region to be detected in a scanned object;

controlling the magnetic resonance scanner to set an acceleration factor in the initial scanning protocol according to the size proportion so as to generate a target scanning protocol; and

and controlling the magnetic resonance scanner to execute the target scanning protocol so as to perform magnetic resonance imaging scanning on the region to be detected.

In one embodiment, the method further comprises:

the camera is arranged outside the magnetic resonance scanner or in the scanning cavity, and the view field of the camera covers the scanning bed.

According to the acceleration factor adjusting method, the magnetic resonance imaging scanning method, the device and the equipment, the acceleration factor is adjusted according to the adjusting parameter by acquiring at least one adjusting parameter of the tissue type, the size proportion, the radio frequency receiving coil parameter, the scanning protocol parameter and the like of the region to be detected, so that the automatic adjustment of the acceleration factor is realized, and the intelligent of the adjustment of the acceleration factor is improved. Meanwhile, according to the acceleration factors determined by the plurality of adjustment parameters, the accuracy of magnetic resonance imaging can be guaranteed, the sampling speed can be increased, and the sampling time can be shortened.

Drawings

FIG. 1 is a flow diagram of a method of acceleration factor adjustment in one embodiment;

FIG. 2 is a schematic diagram of acquiring an entire contour image of a scanned object by a camera in one embodiment;

FIG. 3 is a schematic diagram of inputting a region to be detected to a center terminal through a touch screen in one embodiment;

FIG. 4 is a schematic diagram of a principle of inputting a region to be detected to a center terminal through a touch screen in one embodiment;

FIG. 5 is a schematic diagram of a principle of inputting a region to be detected to a center terminal through a key in one embodiment;

FIG. 6 is a flow chart illustrating steps for acquiring a dimension ratio when an imaging scan of an area to be detected is a two-dimensional scan in one embodiment;

FIG. 7 is a schematic diagram of the principle of acquiring the size ratio when the imaging scan of the region to be detected is a two-dimensional scan in one embodiment;

FIG. 8 is a flow chart illustrating steps for acquiring a dimension ratio when an imaging scan of a region to be detected is a three-dimensional scan in one embodiment;

FIG. 9 is a schematic diagram of a dimension ratio obtained when an imaging scan of a region to be detected is a three-dimensional scan in one embodiment;

FIG. 10 is a flowchart illustrating steps for adjusting an acceleration factor according to an adjustment parameter in one embodiment;

FIG. 11 is a flowchart illustrating a step of adjusting an acceleration factor according to an adjustment parameter according to another embodiment;

FIG. 12 is a flow chart of a magnetic resonance imaging scanning method in one embodiment;

FIG. 13 is a block diagram of an acceleration factor adjustment device in one embodiment;

figure 14 is a block diagram of a magnetic resonance imaging scanner apparatus in one embodiment;

fig. 15 is an internal structural view of a computer device in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

The acceleration factor adjusting method and the magnetic resonance imaging scanning method provided by the embodiment of the application can be applied to a magnetic resonance imaging device and are used for automatically adjusting the acceleration factor, and then magnetic resonance imaging is carried out according to the adjusted acceleration signal. The acceleration factor adjusting method and the magnetic resonance imaging scanning method provided by the embodiment of the application can be particularly applied to computer equipment, and the computer equipment can be but not limited to various personal computers, notebook computers, smart phones, tablet computers and portable wearable equipment. The computer device comprises a memory and a processor, wherein the memory can store data and a computer program, and the processor can execute the computer program to realize the acceleration factor adjusting method and the magnetic resonance imaging scanning method provided by the embodiment of the application. The acceleration factor adjustment method and the magnetic resonance imaging scanning method are described in further detail below with reference to specific examples.

Referring to fig. 1, an embodiment of the present application provides a method for adjusting an acceleration factor, the method including:

s10, acquiring adjustment parameters, wherein the adjustment parameters comprise at least one Of tissue type, size proportion, radio frequency receiving coil parameters and scanning protocol parameters Of an area to be detected, the size proportion is used for representing the size proportion Of the area to be detected in a scanning range (FOV) along a phase encoding direction, the radio frequency receiving coil parameters refer to parameters representing the performance Of the radio frequency receiving coil, and the scanning protocol parameters refer to parameters representing the characteristics Of a scanning protocol.

S20, adjusting the acceleration factor according to the adjustment parameter.

The region to be detected refers to the region to be detected in the scanned object. The tissue type refers to the type of tissue organ to which the region to be detected belongs. For example, the scanned object is a human body, and the tissue type of the region to be detected may be chest, liver, heart, or the like. Because of the different tissue types and different structures, different acceleration factors can be set according to the different tissue types of the region to be detected. In one embodiment, a correspondence between tissue types and acceleration factors may be preset, for example, when the acceleration factor corresponding to the head is A1, the acceleration factor corresponding to the lumbar vertebra is A2, and the acceleration factor corresponding to the liver is A3 … … for scanning, the tissue types of the region to be detected are input, and the corresponding acceleration factors may be obtained according to the correspondence.

The acceleration factor is used to determine the number of phase encoding lines that need to be acquired for the K-space sampling trajectory. Typically, the setting may be made initially, for example, the acceleration factor is initially set to 1, indicating that the sampling trajectory of the K-space is fully sampled. The K space can comprise a low-frequency area and a high-frequency area, after the acquisition of the low-frequency area is completed according to the acceleration factor obtained after adjustment, the high-frequency area also needs to acquire the phase encoding lines reaching the set number of the acceleration factors according to the acceleration factor obtained after adjustment.

The scan range may be determined according to an initial scan protocol or may be determined according to a scan range value entered by a user. The scanning range extends along the readout (frequency) encoding direction and the phase encoding direction, and the scanning field is the actual size of the image area in the readout encoding direction and the phase encoding direction, and the shape of the scanning range can be specifically set according to the area to be detected in the scanning object, for example: the range of the phase encoding direction may be smaller than the range of the readout encoding direction, the FOV forms a rectangular FOV. The scan range is typically arranged within a central region of the main magnetic field of the magnetic resonance imaging apparatus. The size ratio refers to the ratio of the size of the region to be detected in the phase encoding direction to the size of the scanning range in the phase encoding direction. The size of the region to be detected along the phase encoding direction can be obtained by rapidly acquiring magnetic resonance signals, a magnetic resonance contour image of the region to be detected is obtained by calculation according to the magnetic resonance contour image, and the magnetic resonance signals can be an independent pre-scanning sequence so as to improve the efficiency of acquiring the magnetic resonance contour image. The size of the area to be detected in the phase encoding direction can also be measured by external sensors, such as cameras, radars, etc.

Referring to fig. 2 to 5, in one embodiment, the size of the region to be detected along the phase encoding direction is measured by a camera. A magnetic resonance imaging scanning apparatus as shown in fig. 2, which is arranged inside a scan room, the magnetic resonance imaging scanning apparatus comprising: the device comprises a magnetic resonance scanner arranged in a scanning room, a scanning bed arranged in the scanning room, a camera of the scanning bed arranged in the scanning room and a processor, wherein the processor can control the magnetic resonance scanner, the scanning bed and the camera. The processor may be located within the scan room or outside the scan room (e.g., the operator room). The magnetic resonance scanner forms a scanning cavity, the scanning bed is used for supporting the detection object, the scanning bed can move and move the detection object to the inside of the scanning cavity, and the camera can be an optical camera, a thermal imaging camera and the like. The camera can be arranged above a sickbed of the magnetic resonance imaging device, and the view field of the camera can cover the sickbed; the camera can also be arranged in a scanning cavity formed by the magnetic resonance imaging device, and specifically arranged in the central area of the FOV formed by the magnetic resonance imaging device. The whole contour image of the scanned object is acquired by the camera, and the approximate position distribution of the trunk, the limbs and each organ of the scanned object can be determined according to the contour image. The camera is in communication connection with the terminal. And the acquired contour image is transmitted to the terminal and displayed at the terminal. The operator can input the region to be detected to the terminal through a display interface on which the contour image is displayed. In one embodiment, the operator may input the region to be detected to the middle terminal through an input manner such as a touch screen (as shown in fig. 2 to 4), a key (as shown in fig. 5), a knob, or a mouse-keyboard. Taking touch screen input as an example, a plurality of area positioning lines can be displayed on the terminal, in this embodiment, two of the area positioning lines are in each of the x-axis direction and the y-axis direction, and the area to be detected can be determined by the two positioning lines. The operator can set the area to be detected by sliding a finger on the touch screen of the terminal and moving the position of the area positioning line. Alternatively, the operator may define the area to be detected by sliding a finger over the touch screen to circle out irregularly shaped area location lines. The touch screen may be provided as a mobile or fixed to the front panel of the magnetic resonance scanner.

After the region to be detected is obtained, the size of the region to be detected along the phase encoding direction is calculated, and the size ratio is obtained by calculating the size of the region to be detected and the size of the scanning range along the phase encoding direction. And automatically adjusting the acceleration factor according to the acquired size proportion. Alternatively, the larger the size ratio, the smaller the acceleration factor; the smaller the size ratio, the larger the acceleration factor. When the size ratio is larger, the size of the region to be detected is closer to the size of the scanning range, the set acceleration factor is larger, and the imaging accuracy is affected when undersampling of the region to be detected is more; the problem of accuracy reduction caused by too little sampling data of the area to be detected can be avoided by setting a smaller acceleration factor. On the contrary, the smaller the size proportion is, the larger the size difference between the size of the area to be detected and the size of the scanning range is, the larger acceleration factor is set, the sampling speed can be effectively improved, and the undersampling of the area to be detected is not influenced excessively.

The radio frequency receive coil parameters of the magnetic resonance apparatus are used to characterize the radio frequency receive coil. The characteristics of the radio frequency receive coil can characterize the ability of the magnetic resonance apparatus to receive sampled data. Radio frequency receive coil parameters include, but are not limited to, coil unit number, target spatial distribution parameters, coil sensitivity, accuracy, and the like. The number of coil units refers to the number of coil units contained in a radio frequency receiving coil of the magnetic resonance device. The larger the number of coil units, the stronger the receiving ability for the sampled data. The target spatial distribution parameters refer to the number and position parameters of radio frequency receiving coils distributed in a preset spatial range of the region to be detected. If the area to be detected is a head, the more the number of the radio frequency coils is distributed in a preset spatial range around the head, the stronger the receiving capability of the sampled data, the closer the position is to the head, and the stronger the receiving capability of the sampled data. The larger the parameters such as coil sensitivity and accuracy, the stronger the receiving ability of the sampled data. The better the performance of the radio frequency receiving coil characterized by the radio frequency receiving coil parameters is, the stronger the receiving capability of the radio frequency receiving coil on the sampled data is, and the larger the acceleration factor can be set. Therefore, the accuracy requirement of data sampling can be ensured, and the sampling speed can be effectively improved.

The scan protocol parameters are used to characterize the scan protocol. Scan protocol parameters include, but are not limited to, spatial resolution, reconstruction Time (TR), echo Time (TE), effective echo time (effective TE), echo chain length (echo train length, ETL), echo Spacing (ES), inversion Time (TI), excitation number (number of excitation), acquisition Time (TA), slice thickness (slice gap), slice gap, matrix, deflection angle (flip angle), phase encoding step number, whether fat is pressed, etc. The scan protocol parameters are different and the acceleration factors required are different. In one embodiment, the corresponding relation between different scan protocol parameters and acceleration factors can be preset, and when the scan protocol is used, the corresponding acceleration factors are obtained according to the parameters of the scan protocol.

It should be noted that the above adjustment parameters may be used alone or in combination. That is, the acceleration factor may be adjusted according to one of several adjustment parameters, or the acceleration factor may be adjusted by two or more adjustment parameters as a basis, together. When the adjusting parameters are two or more, the influence of each adjusting parameter on the accelerating factors can be balanced, the final accelerating factors can be calculated or set, a new scanning protocol is formed according to the final accelerating factors, and the scanning is performed according to the new scanning protocol.

In this embodiment, the computer device adjusts the acceleration factor according to the adjustment parameter by acquiring at least one adjustment parameter of the tissue type, the size proportion, the radio frequency receiving coil parameter, the scanning protocol parameter, and the like of the region to be detected, thereby realizing automatic adjustment of the acceleration factor and improving the intelligence of adjustment of the acceleration factor. Meanwhile, according to the acceleration factors determined by the plurality of adjustment parameters, the accuracy of magnetic resonance imaging can be guaranteed, the sampling speed can be increased, and the sampling time can be shortened.

The magnetic resonance imaging scan may be a two-dimensional scan or a three-dimensional scan. The two-dimensional scanning includes a phase encoding direction and a readout encoding direction. The three-dimensional scanning includes two phase encoding directions and one readout encoding direction.

Referring to fig. 6, in one embodiment, when the imaging scan of the region to be detected is a two-dimensional scan, the step of obtaining the dimension ratio may include the following steps, that is, S10 includes:

s111, acquiring the length of projection of the region to be detected along the phase encoding direction, and obtaining the length of the region to be detected;

s112, acquiring the length of the scanning range along the phase encoding direction to obtain the length of the scanning range;

S113, calculating the ratio of the length of the area to be detected to the length of the scanning range to obtain the size ratio.

Referring to fig. 7, a rectangular frame in the figure indicates a scanning range, and a black ellipse indicates a projection of a region to be detected along a phase encoding direction. The length of the projection of the region to be detected along the coding direction, i.e. the length of the region to be detected is a, and the length of the scanning range along the phase coding direction, i.e. the length of the scanning range is a+b1+b2, the dimension ratio r=a/a+b1+b2.

Referring to fig. 8, in an embodiment, when the imaging scan of the region to be detected is a three-dimensional scan, the step of obtaining the dimension ratio may include the following steps, that is, S10 includes:

s121, obtaining the area of the area to be detected, and obtaining the area of the area to be detected;

s122, acquiring the area of the scanning range to obtain the area of the scanning range;

s123, calculating the ratio of the area to be detected to the area of the scanning range, and obtaining the size ratio.

Referring to fig. 9, the three-dimensional scanning includes two mutually perpendicular phase encoding directions: a phase encoding direction 1 and a phase encoding direction 2. In the figure, a rectangular frame represents a scanning range, and a black ellipse represents a region to be detected. Let the area of the area to be detected be C, the area of the scanning range be c+d, where D is the area of other areas in the scanning range that do not include the area to be detected, the size ratio r=c/c+d.

In the two embodiments, the size proportion of the adjusting parameter is calculated for the two-dimensional scanning and the three-dimensional scanning respectively, the calculating method is simple, the execution operation is rapid, and the acceleration factor adjustment and the magnetic resonance imaging scanning efficiency can be effectively improved.

The present embodiment relates to one possible implementation manner of adjusting the acceleration factor according to the adjustment parameter when the adjustment parameter is the size ratio, that is, S20 includes:

and S210, adjusting the acceleration factor according to the size proportion, wherein the larger the size proportion is, the smaller the acceleration factor is.

In one embodiment, when the acceleration factor is adjusted according to the size ratio, if the size ratio r is greater than 0.5, the acceleration factor AF is adjusted to 2.0; if the size ratio r is equal to or smaller than 0.5, the acceleration factor AF is adjusted to be the reciprocal of the size ratio. I.e. if r >0.5, af=2.0, if r is less than or equal to 0.5, af=1/r. When the size ratio is small (less than or equal to 0.5), the acceleration factor is correspondingly regulated according to the size ratio, and when the size ratio is large (greater than 0.5), the acceleration factor is set to be a fixed value of 2.0, so that the sampling speed is not influenced by the fact that the size ratio is too large and the set acceleration factor is too small. The acceleration factor is adjusted, and meanwhile, a certain sampling speed is ensured, so that the method is more suitable for practical application.

In one embodiment, when the adjustment parameter is a radio frequency receiving coil parameter, the adjustment parameter includes at least one of a coil unit number, a target spatial coil distribution parameter, and a coil sensitivity, where the target spatial coil distribution parameter is used to characterize a number and a position parameter of radio frequency receiving coils distributed in a preset spatial range of the region to be detected. The meaning of the specific parameters is referred to the above embodiments, and will not be described herein.

When the adjustment parameter is a radio frequency receiving coil parameter, adjusting the acceleration factor according to the adjustment parameter includes the following steps, that is, S20 includes:

s220, adjusting an acceleration factor according to the radio frequency receiving coil parameters, wherein the larger the number of coil units is, the larger the acceleration factor is, the larger the target space coil distribution parameters are, the larger the acceleration factor is, the higher the coil sensitivity is, and the larger the acceleration factor is.

As described above, the larger the number of coil units, the stronger the receiving ability for the sampled data. The larger the target spatial distribution parameter, the stronger the receiving capability for the sampled data. The greater the coil sensitivity and accuracy, the greater the ability to receive sampled data. Therefore, the larger the number of coil units, the larger the target space coil distribution parameter, the higher the coil sensitivity, and the larger the set acceleration factor. Therefore, the accuracy requirement of data sampling can be ensured, and the sampling speed can be effectively improved.

Referring to fig. 10, in one embodiment, when the adjustment parameter is a tissue type and/or a scan protocol parameter, adjusting the acceleration factor according to the adjustment parameter includes the following steps, that is, S20 includes:

s231, determining a preset target acceleration factor corresponding to the tissue type and/or the scanning protocol parameters;

s232, adjusting the acceleration factor to a preset target acceleration factor.

That is, a correspondence relationship between the tissue type and/or the scan protocol parameter and the acceleration factor may be pre-established, and when in use, the corresponding acceleration factor is determined according to the tissue type and/or the scan protocol parameter. In this embodiment, the corresponding target acceleration factor is determined by the tissue type and/or the scanning protocol parameter, so that the method is simple and fast, and the acceleration factor matched with the tissue type and/or the scanning protocol parameter can be set according to practical use experience, so that the accuracy and the sampling speed of imaging scanning are ensured.

Referring to fig. 11, when the adjustment parameters include the size ratio, the radio frequency receiving coil parameters, the tissue type and the scan protocol parameters, the method for adjusting the acceleration factor in this embodiment, S20 includes:

s241, determining an acceleration factor according to the size proportion to obtain a first acceleration factor;

S242, determining an acceleration factor according to the radio frequency receiving coil parameters to obtain a second acceleration factor;

s243, determining an acceleration factor according to the tissue type and the scanning protocol parameters to obtain a third acceleration factor;

s244, obtaining a final acceleration factor according to the first acceleration factor, the second acceleration factor and the third acceleration factor;

s245, adjusting the acceleration factor to be a final acceleration factor.

The specific determination method of the first acceleration factor, the second acceleration factor and the third acceleration factor is referred to the above embodiment, and will not be described herein. Let the first acceleration factor be AF1, the second acceleration factor be AF2, the third acceleration factor be AF3, and the final acceleration factor be AF, af=f (AF 1, AF2, AF 3). That is, the final acceleration factor is a function of the first acceleration factor, the second acceleration factor, and the third acceleration factor.

There are various specific methods for determining the final acceleration factor, and in one embodiment, the final acceleration factor may be obtained by accelerating the product of the first acceleration factor, the second acceleration factor, and the third acceleration factor.

In this embodiment, the first acceleration factor, the second acceleration factor and the third acceleration factor are calculated respectively, and the final acceleration factor is obtained according to the first acceleration factor, the second acceleration factor and the third acceleration factor, so that the determination of the final acceleration factor refers to a plurality of adjustment parameters, the obtained final acceleration factor is more suitable, and not only can the requirement of imaging accuracy be met, but also the acceleration requirement can be met.

Referring to fig. 12, an embodiment of the present application further provides a magnetic resonance imaging scanning method, the method including:

s40, providing an initial scanning protocol, determining a scanning range through the initial scanning protocol, and extending the scanning range along the phase coding direction;

s50, acquiring a contour image of a region to be detected in a scanned object;

s60, determining the size proportion of the contour image in the scanning range along the phase encoding direction;

s70, setting an acceleration factor in the initial scanning protocol according to the size proportion to generate a target scanning protocol;

s80, executing a target scanning protocol to perform magnetic resonance imaging scanning on the region to be detected.

The initial scan protocol refers to a scan protocol in which no acceleration factor adjustment is performed. The initial scan protocol may be obtained from a direct read-out from the magnetic resonance imaging apparatus. The initial scan protocol may include a variety of information such as scan range, acceleration factor, scan protocol parameters (spatial resolution, whether to compress fat, etc.), etc.

The outline image of the region to be detected refers to an image obtained by scanning the region to be detected. The contour image of the region to be detected can send magnetic resonance signals of an independent sequence through a radio frequency transmitting coil, and the magnetic resonance signals are acquired through a radio frequency receiving coil, so that the contour image of the region to be detected is obtained. When the magnetic resonance signals are acquired, one-bit magnetic resonance signals can be acquired, or two-dimensional magnetic resonance images can be acquired, which is not limited.

After the contour image of the region to be detected is obtained, the size proportion of the contour image in the scanning range along the phase encoding direction is calculated, and an acceleration factor is further set according to the size proportion, so that a target scanning protocol is generated. Specific calculation and setting methods refer to the above embodiments, and are not described herein.

The magnetic resonance device performs magnetic resonance imaging scanning according to the target scanning protocol, and the setting of the acceleration factor in the target scanning protocol is based on the setting of the size proportion of the contour image in the scanning range, so that the magnetic resonance scanning can not only ensure the accuracy requirement of imaging, but also improve the sampling speed, shorten the scanning and further improve the imaging scanning efficiency. Meanwhile, through the above process, the automatic setting of the acceleration factor during magnetic resonance scanning is realized, manual operation is not needed, and the intelligence is high.

In one embodiment, the method further comprises:

s90, obtaining the tissue type of the region to be detected, the radio frequency receiving coil parameters and the scanning protocol parameters.

Correspondingly, in the above step, S70 includes:

and setting an acceleration factor in the initial scanning protocol according to at least one of the tissue type, the size proportion, the radio frequency receiving coil parameter and the scanning protocol parameter of the region to be detected so as to generate a target scanning protocol.

The tissue type of the region to be detected, the meaning of the radio frequency receiving coil parameter and the scanning protocol parameter, the acquiring method, and the specific method process and beneficial effects of further determining the acceleration factor are not described herein again with reference to the above embodiments.

It should be understood that, although the steps in the flowchart are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of other steps or other steps.

In one embodiment, as shown in fig. 13, there is provided an acceleration factor adjusting apparatus 100 including: a parameter acquisition module 101 and an adjustment module 102, wherein:

A parameter obtaining module 101, configured to obtain an adjustment parameter, where the adjustment parameter includes at least one of a tissue type, a size proportion of a region to be detected, a radio frequency receiving coil parameter, and a scanning protocol parameter, where the size proportion is used to characterize a proportion of a size of the region to be detected to a size of a scanning range along a phase encoding direction, the radio frequency receiving coil parameter is a parameter that characterizes performance of the radio frequency receiving coil, and the scanning protocol parameter is a parameter that characterizes a characteristic of a scanning protocol;

the adjusting module 102 is configured to adjust the acceleration factor according to the adjustment parameter.

In one embodiment, the imaging scan of the to-be-detected area is two-dimensional scan, the adjustment parameter is a size ratio, and the parameter obtaining module 101 is specifically configured to obtain a length of the to-be-detected area along a projection of the to-be-detected area in a phase encoding direction, so as to obtain the length of the to-be-detected area; acquiring the length of the scanning range along the phase coding direction to obtain the length of the scanning range; and calculating the ratio of the length of the region to be detected to the length of the scanning range to obtain the size ratio.

In one embodiment, the imaging scan of the area to be detected is a three-dimensional scan, the adjustment parameter is a size ratio, and the parameter obtaining module 101 is specifically configured to obtain an area of the area to be detected; acquiring the area of the scanning range; and calculating the ratio of the area to be detected to the area of the scanning range to obtain the size ratio.

In one embodiment, the adjusting module 102 is specifically configured to adjust the acceleration factor according to the size ratio, where the larger the size ratio is, the smaller the acceleration factor is.

In one embodiment, the adjusting module 102 is specifically configured to adjust the acceleration factor to 2.0 if the size ratio is greater than 0.5; and if the size ratio is less than or equal to 0.5, adjusting the acceleration factor to be the inverse of the size ratio.

In one embodiment, the adjusting module 102 is specifically configured to adjust the acceleration factor according to the radio frequency receiving coil parameter, where the larger the number of coil units is, the larger the acceleration factor is, the larger the target spatial coil distribution parameter is, the larger the acceleration factor is, the higher the coil sensitivity is, and the larger the acceleration factor is.

In one embodiment, the adjustment parameter is the tissue type and/or the scan protocol parameter, and the adjustment module 102 is specifically configured to determine a preset target acceleration factor corresponding to the tissue type and/or the scan protocol parameter; and adjusting the acceleration factor to the preset target acceleration factor.

In one embodiment, the adjusting module 102 is specifically configured to determine an acceleration factor according to the size ratio, so as to obtain a first acceleration factor; determining an acceleration factor according to the radio frequency receiving coil parameters to obtain a second acceleration factor; determining an acceleration factor according to the tissue type and the scanning protocol parameter to obtain a third acceleration factor; obtaining a final acceleration factor according to the first acceleration factor, the second acceleration factor and the third acceleration factor; and adjusting the acceleration factor to be the final acceleration factor.

In one embodiment, the adjusting module 102 is specifically configured to calculate a product of the first acceleration factor, the second acceleration factor, and the third acceleration factor, to obtain the final acceleration factor.

In one embodiment, as shown in fig. 14, there is provided a magnetic resonance imaging scanning apparatus 200 comprising: an initial protocol acquisition module 201, a contour image acquisition module 202, a size scale determination module 203, a target protocol generation module 204, and a scan module 205, wherein:

An initial protocol acquisition module 201, configured to provide an initial scanning protocol, and determine a scanning range according to the initial scanning protocol, where a phase encoding direction of the scanning range extends;

a contour image obtaining module 202, configured to obtain a contour image of a region to be detected in a scanned object;

a size ratio determining module 203, configured to determine a size ratio of the contour image in the scanning range along a phase encoding direction;

a target protocol generating module 204, configured to set an acceleration factor in the initial scanning protocol according to the size ratio, so as to generate a target scanning protocol;

a scanning module 205, configured to execute the target scanning protocol to perform magnetic resonance imaging scanning on the region to be detected.

In one embodiment, the magnetic resonance imaging scanning apparatus 200 further comprises a remaining parameter acquisition module 206 for acquiring a tissue type of the region to be detected, radio frequency receive coil parameters and scan protocol parameters.

In one embodiment, the target protocol generation module 204 is further configured to set an acceleration factor in the initial scan protocol according to at least one of the tissue type, the size ratio, the radio frequency receive coil parameter, and the scan protocol parameter, to generate a target scan protocol.

For specific limitations on the acceleration factor adjustment device 100 and the magnetic resonance imaging scanning device 200, reference may be made to the above limitations on the acceleration factor adjustment method and the magnetic resonance imaging scanning method, and no further description is given here. The various modules in the acceleration factor adjusting device 100 and the magnetic resonance imaging scanning device 200 described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, a computer device is provided, which may be a terminal, and an internal structure diagram thereof may be as shown in fig. 15. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement an acceleration factor adjustment method and a magnetic resonance imaging scanning method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.

It will be appreciated by those skilled in the art that the structure shown in fig. 15 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the computer device to which the present application is applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:

and adjusting an acceleration factor according to the adjustment parameter.

In one embodiment, the processor when executing the computer program further performs the steps of: acquiring the length of the projection of the region to be detected along the phase encoding direction, and obtaining the length of the region to be detected; acquiring the length of the scanning range along the phase coding direction to obtain the length of the scanning range; and calculating the ratio of the length of the region to be detected to the length of the scanning range to obtain the size ratio.

In one embodiment, the processor when executing the computer program further performs the steps of: acquiring the area of the region to be detected; acquiring the area of the scanning range; and calculating the ratio of the area to be detected to the area of the scanning range to obtain the size ratio.

In one embodiment, the processor when executing the computer program further performs the steps of: and adjusting the acceleration factor according to the size proportion, wherein the larger the size proportion is, the smaller the acceleration factor is.

In one embodiment, the processor when executing the computer program further performs the steps of: if the size ratio is greater than 0.5, adjusting the acceleration factor to 2.0; and if the size ratio is less than or equal to 0.5, adjusting the acceleration factor to be the inverse of the size ratio.

In one embodiment, the processor when executing the computer program further performs the steps of: and adjusting the acceleration factor according to the radio frequency receiving coil parameters, wherein the larger the number of the coil units is, the larger the acceleration factor is, the larger the target space coil distribution parameters are, the larger the acceleration factor is, the higher the coil sensitivity is, and the larger the acceleration factor is.

In one embodiment, the processor when executing the computer program further performs the steps of: determining a preset target acceleration factor corresponding to the tissue type and/or the scanning protocol parameter; and adjusting the acceleration factor to the preset target acceleration factor.

In one embodiment, the processor when executing the computer program further performs the steps of: determining an acceleration factor according to the size proportion to obtain a first acceleration factor; determining an acceleration factor according to the radio frequency receiving coil parameters to obtain a second acceleration factor; determining an acceleration factor according to the tissue type and the scanning protocol parameter to obtain a third acceleration factor; obtaining a final acceleration factor according to the first acceleration factor, the second acceleration factor and the third acceleration factor; and adjusting the acceleration factor to be the final acceleration factor.

In one embodiment, the processor when executing the computer program further performs the steps of: and calculating the product of the first acceleration factor, the second acceleration factor and the third acceleration factor to obtain the final acceleration factor.

In one embodiment, there is provided a magnetic resonance imaging scanning apparatus comprising: the magnetic resonance scanner, the scanner bed, a memory and a processor, wherein the memory stores a computer program, and the processor can control the magnetic resonance scanner and the scanner bed. The processor when executing the computer program implements: providing an initial scanning protocol, and controlling a magnetic resonance scanner to determine the scanning range of a scanning cavity through the initial scanning protocol, wherein the scanning range extends along the phase encoding direction; acquiring a contour image of a region to be detected in a scanned object; determining the size proportion of the contour image in the scanning range along the phase encoding direction; controlling a magnetic resonance scanner to set an acceleration factor in an initial scanning protocol according to the size proportion so as to generate a target scanning protocol; and controlling the magnetic resonance scanner to execute the target scanning protocol so as to perform magnetic resonance imaging scanning on the region to be detected.

In one embodiment, a magnetic resonance scanner is disposed within the scan room as shown in figure 2. A scan bed is within the scan room for supporting the test object and is drivable to move the test object into and out of the scan cavity.

Alternatively, the processor may be disposed within the scan room or outside the scan room. In one embodiment, further comprising: the camera is arranged outside the magnetic resonance scanner or in the scanning cavity. As shown in fig. 2, the camera is positioned on the ceiling of the scanning room and the field of view of the camera covers the scanning bed.

In one embodiment, the processor when executing the computer program further performs the steps of: and obtaining the tissue type of the region to be detected, the radio frequency receiving coil parameters and the scanning protocol parameters.

In one embodiment, the processor when executing the computer program further performs the steps of: and setting an acceleration factor in the initial scanning protocol according to at least one of the tissue type, the size proportion, the radio frequency receiving coil parameter and the scanning protocol parameter so as to generate a target scanning protocol.

In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:

And adjusting an acceleration factor according to the adjustment parameter.

In one embodiment, the computer program when executed by the processor further performs the steps of: acquiring the length of the projection of the region to be detected along the phase encoding direction, and obtaining the length of the region to be detected; acquiring the length of the scanning range along the phase coding direction to obtain the length of the scanning range; and calculating the ratio of the length of the region to be detected to the length of the scanning range to obtain the size ratio.

In one embodiment, the computer program when executed by the processor further performs the steps of: acquiring the area of the region to be detected; acquiring the area of the scanning range; and calculating the ratio of the area to be detected to the area of the scanning range to obtain the size ratio.

In one embodiment, the computer program when executed by the processor further performs the steps of: and adjusting the acceleration factor according to the size proportion, wherein the larger the size proportion is, the smaller the acceleration factor is.

In one embodiment, the computer program when executed by the processor further performs the steps of: and adjusting the acceleration factor according to the radio frequency receiving coil parameters, wherein the larger the number of the coil units is, the larger the acceleration factor is, the larger the target space coil distribution parameters are, the larger the acceleration factor is, the higher the coil sensitivity is, and the larger the acceleration factor is.

In one embodiment, the computer program when executed by the processor further performs the steps of: determining a preset target acceleration factor corresponding to the tissue type and/or the scanning protocol parameter; and adjusting the acceleration factor to the preset target acceleration factor.

In one embodiment, the computer program when executed by the processor further performs the steps of: determining an acceleration factor according to the size proportion to obtain a first acceleration factor; determining an acceleration factor according to the radio frequency receiving coil parameters to obtain a second acceleration factor; determining an acceleration factor according to the tissue type and the scanning protocol parameter to obtain a third acceleration factor; obtaining a final acceleration factor according to the first acceleration factor, the second acceleration factor and the third acceleration factor; and adjusting the acceleration factor to be the final acceleration factor.

In one embodiment, the computer program when executed by the processor further performs the steps of: and calculating the product of the first acceleration factor, the second acceleration factor and the third acceleration factor to obtain the final acceleration factor.

providing an initial scanning protocol, and determining a scanning range through the initial scanning protocol, wherein the scanning range extends in the phase encoding direction;

acquiring a contour image of a region to be detected in a scanned object;

In one embodiment, the computer program when executed by the processor further performs the steps of: and obtaining the tissue type of the region to be detected, the radio frequency receiving coil parameters and the scanning protocol parameters.

In one embodiment, the computer program when executed by the processor further performs the steps of: and setting an acceleration factor in the initial scanning protocol according to at least one of the tissue type, the size proportion, the radio frequency receiving coil parameter and the scanning protocol parameter so as to generate a target scanning protocol.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A method of acceleration factor adjustment, the method comprising:

Adjusting an acceleration factor according to the adjustment parameter;

wherein the adjusting the acceleration factor according to the adjustment parameter includes:

and obtaining a final acceleration factor according to at least two of the first acceleration factor, the second acceleration factor and the third acceleration factor.

2. The method of claim 1, wherein the imaging scan of the region to be detected is a two-dimensional scan, the adjustment parameter is a dimension ratio, and the obtaining the adjustment parameter includes:

3. The method of claim 1, wherein the imaging scan of the region to be detected is a three-dimensional scan, the adjustment parameter is a dimension ratio, and the obtaining the adjustment parameter includes:

Acquiring the area of the region to be detected;

acquiring the area of the scanning range;

4. The method of claim 1, wherein the adjustment parameter is the radio frequency receive coil parameter, the adjustment parameter comprising at least one of a coil unit number, a target spatial coil distribution parameter, and a coil sensitivity, wherein the target spatial coil distribution parameter is used to characterize a number and a location parameter of radio frequency receive coils distributed within a preset spatial range of the region to be detected;

the adjusting the acceleration factor according to the adjustment parameter comprises:

5. The method according to claim 1, wherein the adjustment parameter is the tissue type and/or the scan protocol parameter, the adjusting an acceleration factor according to the adjustment parameter comprising:

and adjusting the acceleration factor to the preset target acceleration factor.

6. The method of claim 1, wherein said adjusting an acceleration factor in accordance with said adjustment parameter comprises:

and adjusting the acceleration factor to be the final acceleration factor.

7. A method of magnetic resonance imaging scanning, comprising:

acquiring a contour image of a region to be detected in a scanned object;

8. A magnetic resonance imaging scanning apparatus, the apparatus comprising:

9. A magnetic resonance imaging scanning apparatus comprising:

a memory and a processor, said memory storing a computer program, characterized in that said processor is arranged within or outside a scanning room, said processor implementing when executing said computer program:

acquiring a contour image of a region to be detected in a scanned object;

10. The apparatus as recited in claim 9, further comprising: