CN111616723B - Scanning protocol adjusting device and scanning protocol adjusting method - Google Patents
Scanning protocol adjusting device and scanning protocol adjusting method Download PDFInfo
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Abstract
The invention provides a scanning protocol adjusting device and a scanning protocol adjusting method which can intuitively display the abnormality of a scanning protocol and are convenient for adjusting the scanning protocol. The scanning protocol adjusting device comprises: a protocol reference standard plane drawing unit that calculates and draws a protocol reference standard plane as a reference standard in a space in which each evaluation parameter is displayed as a dimension, based on a predetermined range of the evaluation parameter used when evaluating the scanning protocol; a scan protocol evaluation parameter prediction unit for predicting the evaluation parameters corresponding to the scan protocol to obtain an evaluation parameter prediction result; a mapping unit configured to map the result of the evaluation parameter prediction to the space; and an evaluation adjustment unit configured to evaluate or adjust the scanning protocol based on a positional relationship between the evaluation parameter prediction result and the protocol reference standard plane.
Description
Technical Field
The present invention relates to a scanning protocol adjustment device and a scanning protocol adjustment method that can adjust a scanning protocol.
Background
In the field of medical equipment, when an object (patient) is scanned with radiation such as X-rays, an X-ray CT (computed tomography: computed tomography) apparatus or the like generally scans according to a preset scanning protocol. The scanning protocol is a set of scanning parameters used when a scanning device such as a CT scanner performs scanning, and includes, for example, scanning parameters such as an irradiation amount of radiation, a scanning time, and the number of times of use. In practice, it is very important to select a suitable scanning protocol for a CT scanning device.
In the prior art, a method of presetting a set of scan protocols, comparing a plurality of scan protocols by using a histogram, and selecting by a viewer is generally adopted.
In addition, the international standard DRL (Diagnostic Reference Levels: diagnostic reference level) can also be utilized to adjust the scanning protocol. DRL is used to identify situations where patient dosage levels or dosing activity is abnormally high. If it is found that the DRL is always exceeded when executing the scanning protocol or predicting the program, the program and the device should be locally checked, and the scanning protocol is adjusted to determine that it has been sufficiently optimized.
A technique of evaluating a scan parameter of a selected scan protocol and generating a signal indicating whether the scan parameter satisfies a scan parameter policy based on the scan parameter is disclosed in patent document 1 (US 2012/0213326 A1), for example.
However, the existing scanning protocol selection method is not intuitive, each chart of each scanning protocol needs to be checked to acquire detailed information, at least three steps are needed, and abnormal protocols cannot be intuitively found.
In addition, the above conventional techniques have not proposed a proposal for how to adjust an abnormal scanning protocol, and it is necessary to make the adjustment by experience of a viewer or the like.
Disclosure of Invention
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a scanning protocol adjustment device and a scanning protocol adjustment method that can intuitively display an abnormality in a scanning protocol and facilitate adjustment of the scanning protocol.
One technical scheme is a scanning protocol adjusting device, comprising: a protocol reference standard plane drawing unit that calculates and draws a protocol reference standard plane as a reference standard in a space in which each evaluation parameter is displayed as a dimension, based on a predetermined range of the evaluation parameter used when evaluating the scanning protocol; a scan protocol evaluation parameter prediction unit for predicting the evaluation parameters corresponding to the scan protocol to obtain an evaluation parameter prediction result; a mapping unit configured to map the result of the evaluation parameter prediction to the space; and an evaluation adjustment unit configured to evaluate or adjust the scanning protocol based on a positional relationship between the evaluation parameter prediction result and the protocol reference standard plane.
The scan protocol adjustment device may be located in a scan protocol management server that receives a scan protocol from a medical scan device and broadcasts the adjusted scan protocol to the medical scan device and other medical scan devices.
The scanning protocol adjustment device may be located in a medical scanning device that receives a scanning protocol from a scanning protocol management server, converts the scanning protocol into a scanning protocol suitable for its own model, and evaluates or adjusts the converted scanning protocol by using the protocol reference standard plane.
Another technical scheme is a scanning protocol adjusting method, comprising: a protocol reference standard plane drawing step of calculating and drawing a protocol reference standard plane as a reference standard in a space in which each evaluation parameter is displayed as a dimension, based on a prescribed range of the evaluation parameter used when evaluating the scanning protocol; a scanning protocol evaluation parameter prediction step, namely predicting the evaluation parameters corresponding to the scanning protocol to obtain an evaluation parameter prediction result; a mapping step of mapping the result of the evaluation parameter prediction to the space; and an evaluation adjustment step of evaluating or adjusting the scanning protocol according to the positional relationship between the evaluation parameter prediction result and the protocol reference standard surface.
According to the technical scheme of the invention, the abnormality of the scanning protocol can be intuitively displayed, and the scanning protocol can be conveniently adjusted.
Drawings
Fig. 1 is a block diagram showing the configuration of a scanning protocol adjustment apparatus in the first embodiment.
Fig. 2 is a graph showing the relationship of evaluation parameters to diagnostic performance.
FIG. 3 is a schematic block diagram of an artificial intelligence protocol tuning model.
Fig. 4 is a three-dimensional display diagram showing a protocol reference standard plane and scan protocol prediction results for anomalies.
Fig. 5 is a flowchart showing a scanning protocol adjustment operation of the scanning protocol adjustment apparatus in the first embodiment.
Fig. 6 is a block diagram showing the configuration of a scanning protocol adjusting apparatus in the second embodiment.
Fig. 7 is a schematic block diagram of a predictive model.
Fig. 8 is a flowchart showing a scanning protocol adjustment operation of the scanning protocol adjustment apparatus in the second embodiment.
Fig. 9 is a schematic diagram of the configuration of a CT protocol management system in the third embodiment.
Fig. 10 is a flowchart of a protocol management process of the CT protocol management system in the third embodiment.
Fig. 11 is a schematic diagram of the configuration of a CT protocol management system in the fourth embodiment.
Fig. 12 is a flowchart of a protocol management process of the CT protocol management system in the fourth embodiment.
Description of the reference numerals:
1, a scanning protocol management server; a 2CT scanning device; 100. 200 scanning protocol adjusting device; a 10 protocol reference standard plane drawing module; a scan protocol evaluation parameter prediction module; a 30 mapping module; 40, evaluating and adjusting the module; 50, a prediction model building module; 60, a guide information display module; a 41 acceptance module; the artificial intelligence protocol adjusts the model 310.
Detailed Description
The present invention relates to a scanning protocol adjustment apparatus that adjusts a scanning protocol applied when a subject is scanned by a radiation scanning apparatus. The scan protocol is a set of scan parameters used when a scanner such as a CT scanner scans, and an appropriate scan parameter can be selected according to the type of scanner and the scan requirement to form the scan protocol, and includes, for example, any of a tube current, a tube voltage, and a pitch (helical pitch).
The scan protocol adjusting apparatus may be realized by executing software having respective functions of the scan protocol adjusting apparatus by a device having a CPU (central process unit: central processing unit) such as a separate computer provided in the device such as the scan apparatus or the scan protocol management server, or may be realized in hardware as a circuit capable of executing the respective functions of the scan protocol adjusting apparatus. The scanning protocol adjusting apparatus of the present invention may be incorporated in the scanning apparatus described above in advance as a part of the scanning apparatus such as a CT scanning apparatus or a magnetic resonance imaging apparatus.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in the different embodiments, the same reference numerals are used for the same or similar parts, and duplicate explanation is omitted as appropriate.
(first embodiment)
Fig. 1 is a block diagram showing the configuration of a scanning protocol adjustment apparatus in the first embodiment. As shown in fig. 1, the scan protocol adjusting apparatus 100 includes a protocol reference standard surface drawing module 10, a scan protocol evaluation parameter predicting module 20, a mapping module 30, and an evaluation adjusting module 40.
The protocol reference standard plane drawing module 10 calculates and draws a protocol reference standard plane (Protocol Reference Standard Surface, abbreviated to PRSS) as a reference standard in a space in which each evaluation parameter is displayed as a dimension, based on a prescribed range of evaluation parameters used when evaluating a scan protocol. The protocol reference standard plane description module 10 may be a circuit or a software module capable of realizing the above functions.
The evaluation parameter referred to herein is an evaluation parameter used in evaluating a scanning protocol, and an existing usual evaluation parameter such as a parameter indicating an image quality of a medical image scanned by applying the scanning protocol, for example, I image noise, spatial resolution, contrast-to-noise ratio, low contrast resolution, Z-axis resolution, CNR, SNR, or the like can be used; and represents the radiation dose to which the subject is subjected, e.g., dose index (CTDI), dose Length Product (DLP), body-specific dose estimation (SSDE), etc., using a scanning protocol. Image quality and radiation dose are compared in evaluating the scanning protocol. Therefore, image quality and dose are considered herein as the primary evaluation aspects.
A reasonable range of image quality and dose can be determined as a prescribed range based on the characteristics of different types of scanning devices and subjects. That is, the protocol reference standard plane rendering module 10 takes a reasonable range of thresholds representing image quality and dose as an acceptable range, and determines the position and size of the protocol reference standard plane from the acceptable range.
As an example of determining the prescribed range, an acceptable range may be determined by obtaining a relationship between the evaluation parameter and the diagnostic performance from a study of the historical scan image and the diagnostic data. In particular, a reasonable range of the evaluation parameter shown by the diagnostic performance model may be determined as the prescribed range based on the diagnostic performance model indicating the relationship between the evaluation parameter and the diagnostic performance. Such diagnostic performance models may be directly input from the outside or may be made from historical scan images and diagnostic data.
Fig. 2 is a graph showing the relationship of evaluation parameters to diagnostic performance. In the case of using the dose as the horizontal axis, the diagnostic performance and the image quality are improved as shown in fig. 2, the dose is proportional to the image quality, and if the dose is increased, an image with a better image quality can be obtained. However, the relationship between the image quality of a medical image and the diagnostic effect (diagnostic performance) obtained when diagnosis is performed using the medical image is not proportionally increased. When the image quality is high to some extent, even if the image quality is further increased, the diagnostic performance at the time of diagnosis remains at a certain level and the increase is not large. Therefore, an acceptable range can be selected in the interval where the diagnostic performance has stabilized. For example, a range of the dose and the image quality corresponding to the diagnostic performance surrounded by the broken line in fig. 2 can be selected as a predetermined range.
The protocol reference standard plane is a surface showing the acceptable range, and is used as a reference standard. The acceptable range (prescribed range) of the evaluation parameters is expressed herein as the entire range of the coordinate values of the points in the space constituted by the plurality of evaluation parameters, including the variation relationship between the different evaluation parameters. In the case where 2 evaluation parameters are selected as dimensions to display a two-dimensional space, the protocol reference standard plane is a plane surrounded by a closed curve constituted by a combination (coordinate values) of all the evaluation parameters within an acceptable range. In the case where more than 3 evaluation parameters are selected as dimensions to display a multidimensional space, the protocol reference standard plane is a closed surface that encloses a combination of all evaluation parameters within an acceptable range. The closing surface encloses a closed space, which closing surface is preferably curved.
The protocol reference standard plane drawing module 10 may acquire, from the outside, history examination data of evaluation parameters including combinations of evaluation parameters used for a patient examination in practice, project the combinations of the evaluation parameters into a space, and draw a closed surface surrounding all or most of points representing the history examination data in the space as the protocol reference standard plane.
Fig. 4 is a diagram showing an example of the space displayed when the scanning protocol adjustment apparatus 100 performs scanning protocol adjustment. In the example of fig. 4, the dose, CNR, and spatial resolution are taken as dimensions, thereby forming a three-dimensional space. Wherein the hatched portion in fig. 4 indicates an acceptable prescribed range, and the surface surrounding the hatched portion serves as a protocol reference standard surface. Combinations of dose, CNR, and spatial resolution within the acceptable specified range as evaluation parameters are considered as scan results of an acceptable scan protocol.
The scan protocol evaluation parameter prediction module 20 predicts the evaluation parameters corresponding to the scan protocol to obtain an evaluation parameter prediction result. The scan protocol evaluation parameter prediction module 20 may be a circuit or a software module capable of achieving the above functions.
The scan protocol evaluation parameter prediction module 20 may obtain a prediction result of the evaluation parameter corresponding to the scan protocol by using the prior art. For example, the scan protocol evaluation parameter prediction module 20 obtains a prediction result by using statistics of results of evaluation parameters obtained by applying different scan protocols when scanning by the conventional same type of scanning device shown in the history data. The scan protocol evaluation parameter prediction module 20 may receive a prediction model created for the same type of scanning device, and may obtain a prediction result by substituting the scan protocol into the prediction model. In addition, all or part of the evaluation parameters may also be data input empirically by the operator.
The mapping module 30 maps the prediction result of the scan protocol obtained by the scan protocol evaluation parameter prediction module 20 into a space where the protocol reference standard plane is located. The mapping module 30 may be a circuit or a software module capable of implementing the above functions.
For example, in the space shown in fig. 4, a plurality of black dots represent mapped points of the predicted result of each scanning protocol, the position coordinates of each point showing the predicted result. The mapped points are in one-to-one correspondence with the scanning protocol to be evaluated. Wherein most points fall within an acceptable range enclosed by the protocol reference standard surface, and four points do not fall into an enclosed space enclosed by the protocol reference standard surface.
The evaluation adjustment module 40 evaluates or adjusts the scan protocol according to the positional relationship of the points representing the prediction result shown in the space and the protocol reference standard plane. The evaluation adjustment module 40 may be a circuit or a software module capable of realizing the above functions.
Specifically, the evaluation adjustment module 40 determines whether or not a point representing a predicted result falls within an acceptable range enclosed by the protocol reference standard plane, evaluates a scan protocol corresponding to a predicted result that falls within the acceptable range enclosed by the protocol reference standard plane as an acceptable scan protocol, evaluates a scan protocol corresponding to a predicted result that does not fall within the acceptable range enclosed by the protocol reference standard plane as an unacceptable scan protocol, and supplies the evaluated result to the scanning device.
Further, the evaluation adjustment module 40 may determine whether or not a point indicating the prediction result falls within an acceptable range surrounded by the protocol reference standard plane, move a point not falling within the acceptable range surrounded by the protocol reference standard plane to the acceptable range surrounded by the protocol reference standard plane, and adjust the scanning protocol according to the position of the moved point, thereby adjusting the scanning protocol to an acceptable scanning protocol. And provides the adjustment result to the scanning device. The movement rule of the point can be arbitrarily set.
In addition, the method of adjusting the scanning protocol can employ various existing methods. For example, an artificial intelligence protocol adjustment model may be used to adjust the scan protocol and modify the model by making feedback.
FIG. 3 is a schematic block diagram of an artificial intelligence protocol tuning model. The core model in the artificial intelligence protocol tuning model 310 is a dose and image quality SVR (support vector machine regression) model shown at 313. The expected dose and image quality as adjusted parameters shown at 311: raw dose and image quality as mapped point locations shown by CTDvol, CNR, spatial resolution, etc. and 312: CTDvol, CNR, spatial resolution, etc. are all input into a dose and image quality SVR (support vector machine regression) model, resulting in differences 315 of scan parameters in the scan protocol. The adjusted optimized scan parameters 318 are obtained by combining the original scan parameters 314 of the scan protocol before adjustment with the differences 315 of the scan parameters.
In addition, optimized scan parameters 318 may be fed back to learning engine 317 for learning, and training data 316 may be used to refine the dose and image quality SVR (support vector machine regression) model 313.
In the first embodiment, the protocol reference standard plane drawing module 10 corresponds to a "protocol reference standard plane drawing section", the scan protocol evaluation parameter prediction module 20 corresponds to a "scan protocol evaluation parameter prediction section", the mapping module 30 corresponds to a "mapping section", and the evaluation adjustment module 40 corresponds to an "evaluation adjustment section". The flow of the scanning protocol adjustment operation in the first embodiment is described below with reference to fig. 5.
Fig. 5 is a flowchart showing a scanning protocol adjustment operation of the scanning protocol adjustment apparatus in the first embodiment. As shown in fig. 5, when starting the scan protocol adjustment, first, the scan protocol evaluation parameter prediction module 20 obtains a scan protocol, predicts a scan result of the scan protocol, and obtains a prediction result as an evaluation parameter corresponding to the scan protocol (step S501).
Next, the protocol reference standard plane drawing module 10 obtains an acceptable range of the dose and the image quality according to prescribed conditions of the desired image quality, patient information, and the like (step S502), and calculates and draws a protocol reference standard plane as a reference standard in a three-dimensional space in which three parameters in the dose and the image quality are displayed as dimensions as shown in fig. 4, for example, according to the obtained acceptable range of the dose and the image quality (step S503).
Next, the mapping module 30 maps the prediction result of the scan protocol obtained by the scan protocol evaluation parameter predicting module 20 in step S501 into a space where the protocol reference standard plane is located (step S504).
In step S505, the evaluation adjustment module 40 determines whether or not the mapped point is an abnormal point based on the positional relationship between the point representing the prediction result and the protocol reference standard plane mapped by the mapping module 30. If the point indicating the predicted result falls within the acceptable range enclosed by the protocol reference standard plane and it is determined that the point is not an abnormal point (step S505: NO), the flow proceeds to step S507, where the scanning protocol is supplied to the scanner, and the scanner calls the point and scans the point according to the scanning protocol.
On the other hand, when the point indicating the predicted result does not fall within the acceptable range enclosed by the protocol reference standard plane as indicated by the thick black point in fig. 4 and is determined to be an abnormal point (yes in step S505), the flow proceeds to step S506, and the evaluation adjustment module 40 adjusts the scanning protocol using, for example, the artificial intelligence protocol adjustment model shown in fig. 3, and supplies the adjusted scanning protocol to the scanner, and the scanner performs the adjustment to scan in accordance with the scanning protocol (step S507).
In the flowchart in fig. 5, the scan protocol evaluation parameter prediction module 20 obtains the prediction result of the scan protocol, and the protocol reference standard plane drawing module 10 generates the protocol reference standard plane. However, the sequence of the actions of the scan protocol evaluation parameter prediction module 20 and the protocol reference standard plane drawing module 10 may be exchanged, that is, step S502 may be performed first, and then step S501 may be performed.
According to the embodiment, the protocol reference standard surface is used for more intuitively representing the relation between the dosage and the image quality in the scanning result, so that the abnormality of the scanning protocol can be found through intuitively judging the positions of the points and the surfaces in the created space, thereby intuitively displaying the abnormality of the scanning protocol and being convenient for adjusting the scanning protocol.
(second embodiment)
The second embodiment differs from the first embodiment in that the second embodiment further includes a prediction model creation module 50 and a guidance information display module 60, and the evaluation adjustment module 40 further includes a reception module 41. The following mainly describes differences between the second embodiment and the first embodiment, and redundant description is omitted as appropriate.
Fig. 6 is a block diagram showing the configuration of a scanning protocol adjusting apparatus in the second embodiment. As shown in fig. 6, the scan protocol adjusting apparatus 200 includes a protocol reference standard surface drawing module 10, a scan protocol evaluation parameter predicting module 20, a mapping module 30, an evaluation adjusting module 40, a prediction model establishing module 50, and a guidance information displaying module 60.
The predictive model creation module 50 creates a predictive model for predicting the simulation result based on the scan parameters and the historical data of the patient information. The predictive model creation module 50 may be a circuit or a software module capable of implementing the above functions.
The modeling method used by the predictive model creation module 50 may apply various methods that exist. For example, fig. 7 shows an example of a predictive model. The predictive model shown in fig. 7 includes equations established from historical data of scan parameters kV, mA, spiral pitch, collimation, etc. and patient information. When the historical data of scan parameters kV, mA, helical pitch, collimation, etc. and patient information are substituted into the prediction model, the values of dose, spatial resolution, and CNR can be obtained.
The scan protocol evaluation parameter prediction module 20 obtains the evaluation parameters corresponding to the scan protocol as a prediction result by using the prediction model established by the prediction model establishment module 50.
Further, the protocol reference standard plane drawing module 10 calculates and draws a protocol reference standard plane as a reference standard in a space in which each evaluation parameter is displayed as a dimension, based on a prescribed range of evaluation parameters used when evaluating a scan protocol.
In addition, the mapping module 30 maps the prediction result of the scan protocol obtained by the scan protocol evaluation parameter prediction module 20 into a space where the protocol reference standard plane is located.
The guidance information display module 60 can display guidance information for guiding the operator on the display. In particular, when the mapping module 30 maps the prediction result into the above space, guidance information for guiding the action of the operator is displayed. The guidance information can be displayed in a superimposed manner in space, or can be displayed separately. The guidance information display module 60 may be a circuit or a software module capable of realizing the above functions.
The guidance information may be information for prompting the operator to move the mapping point of the mapping module 30 on the display screen by the mouse, or may be a notice that should be used when selecting the scan protocol according to the patient information, country, region, or the like.
For example, in the case of a pediatric general thoracic examination, the following guidance information may be displayed.
"guide:
for pediatric general thoracic examinations, the infant is of less interest. Thus requiring a larger CNR. We also propose to reduce the CNR index based radiation dose reduction on the basis of low tube voltage scanning.
Appropriate CNR is suggested: 12-16 (statistics)
CTDIvol:20-30 (ICRP P87 recommended for general thoracic scans)'.
In addition, in the case where the preferred position in the space is taken as the recommended movement destination, the guidance information displayed on the display by the guidance information display module 60 may be information on the position of the movement destination, thereby prompting the user of the recommended movement destination, and facilitating the user to move the map point to an appropriate position. For example, the guidance information may be coordinate information about a position of the recommended movement destination.
The guidance information display module 60 may also directly show the position of the recommended moving destination in the display of the space, for example, by marking the position of the recommended moving destination in the space with a guidance symbol such as an arrow, or directly drawing a mark such as a point at the position of the recommended moving destination. Thereby more intuitively showing the position of the recommended movement destination of the map point.
The evaluation adjustment module 40 adjusts the scanning protocol according to the positional relationship of the points representing the prediction result shown in the space and the protocol reference standard plane.
In particular, in the second embodiment, the evaluation adjustment module 40 further includes a reception module 41, and the reception module 41 receives a movement operation on the prediction result, and the reception module 41 may be a circuit or a software module capable of realizing the above functions.
The operator can move the point mapped in the space by the mapping module 30 to a desired position by a mouse drag or the like, and the reception module 41 receives the position of the moved point. The evaluation adjustment module 40 determines whether the moved point falls within an acceptable range encompassed by the protocol reference standard plane. And under the condition that the moved point falls within an acceptable range enclosed by the protocol reference standard surface, deducing scanning parameters by using the evaluation parameters corresponding to the position of the moved point, thereby providing the scanning protocol formed by the calculated scanning parameters to the scanning device.
Further, the reception module 41 may receive an input of the operator by directly inputting a desired scan result using an input device such as a keyboard. The evaluation adjustment module 40 moves the corresponding point to the position indicated by the input data received by the reception module 41, based on the input data received by the reception module 41.
In the case where the moved point does not fall within the acceptable range enclosed by the protocol reference standard plane, the evaluation adjustment module 40 determines that the scanning protocol corresponding to the moved point is not an acceptable scanning protocol. The guidance information display module 60 is further caused to display guidance information prompting the operator to move the position of the point until the moved point falls within an acceptable range encompassed by the protocol reference standard plane.
In the second embodiment, the prediction model creation module 50 corresponds to a "prediction model creation unit", the guidance information display module 60 corresponds to a "guidance information display unit", and the reception module 41 corresponds to a "reception unit". The flow of the scanning protocol adjustment operation in the second embodiment is described below with reference to fig. 8.
Fig. 8 is a flowchart showing a scanning protocol adjustment operation of the scanning protocol adjustment apparatus in the second embodiment.
As shown in fig. 8, when starting the scan protocol adjustment, first, the prediction model creation module 50 creates a prediction model for predicting a prediction result from the scan parameter and the history data of the patient information (step S801).
The scan protocol evaluation parameter prediction module 20 obtains a scan protocol, brings the scan protocol into the prediction model, and obtains a prediction result (step S802).
Next, the protocol reference standard plane drawing module 10 obtains an acceptable range of the dose and the image quality according to prescribed conditions of the desired image quality, patient information, and the like (step S803), and calculates and draws a protocol reference standard plane as a reference standard in a three-dimensional space in which three parameters in the dose and the image quality are displayed as dimensions, for example, as shown in fig. 4, according to the obtained acceptable range of the dose and the image quality (step S804).
Next, the mapping module 30 maps the prediction result of the scan protocol obtained by the scan protocol evaluation parameter predicting module 20 in step S802 into the space where the protocol reference standard plane is located (step S805).
In step S806, the evaluation adjustment module 40 determines whether the mapped point is an abnormal point according to the positional relationship between the point representing the prediction result and the protocol reference standard plane mapped by the mapping module 30. If the point indicating the predicted result falls within the acceptable range enclosed by the protocol reference standard plane and it is determined that the point is not an abnormal point (step S806: no), the flow proceeds to step S809, where the scanning protocol is supplied to the scanner, and the scanner calls the point and scans the point according to the scanning protocol.
On the other hand, when the point representing the predicted result is determined to be an abnormal point without falling within the acceptable range enclosed by the protocol reference standard plane as indicated by the thick black point in fig. 4 (yes in step S806), the flow proceeds to step S807 where the operator drags the abnormal point into the enclosed space enclosed by the protocol reference surface using an input device such as a mouse or the operator directly inputs a desired scan result using an input device such as a keyboard.
The evaluation adjustment module 40 adjusts the scanning protocol based on the obtained desired scanning result (step S808), and supplies the adjusted scanning protocol to the scanning device, which invokes the adjustment module to scan the scanning protocol (step S809).
In the flowchart in fig. 8, the execution order of step S802 and step S803 may be changed.
In the present embodiment, the operator is presented with the guidance information display module 60, so that the operator can more efficiently determine and adjust the abnormal point. However, the instruction information display module 60 may be omitted and the operation may be performed directly by the operator according to his own experience.
According to the present embodiment, the operator can intuitively move the abnormal point to a desired position, and the scanning protocol adjustment device can directly output the corresponding adjusted scanning protocol by this movement operation, so that the scanning protocol can be adjusted more easily. In addition, the abnormality of the scanning protocol can be intuitively displayed and the scanning protocol can be conveniently adjusted.
(third embodiment)
The scanning protocol adjusting apparatus of the present invention can be applied to a scanning management system including a medical scanning device and a scanning protocol management server. For example, the scanning protocol adjusting apparatus may be applied to a CT protocol management system (CT Protocol Management (PM)). The combination of the scanning protocol adjusting apparatus and the CT protocol management system will be described below with reference to fig. 9 and 10.
Fig. 9 is a schematic diagram of the configuration of a CT protocol management system in the third embodiment. The CT protocol management system includes a scan protocol management server 1 and a plurality of CT scanning apparatuses 2 of the same type. For simplicity of explanation, two CT scanners 2 (CT-A and CT-A') are provided. In the present embodiment, the scanning protocol adjusting apparatus is installed in the scanning protocol management server 1.
As shown in fig. 9, the scanning protocol management server 1 can perform remote communication with the CT scanner 2 by wireless. The scan protocol is created or modified in the CT scanner CT-a, which sends the new scan protocol to the scan protocol management server 1.
On the other hand, the scanning protocol management server 1 performs examination and approval of the scanning protocol. Specifically, the scan protocol management server 1 analyzes the dose and the image quality, identifies abnormal points, and adjusts parameters as described in the first and second embodiments, evaluates or adjusts the scan protocol, and broadcasts the adjusted (received) scan protocol to the two CT scanning apparatuses 2 (CT-a and CT-a'). Thus, the CT scanning device CT-A can perform scanning by applying the adjusted scanning protocol. The CT scanning device CT-A' may also perform scanning by applying the adjusted scanning protocol.
Fig. 10 is a flowchart of a protocol management process of the CT protocol management system in the third embodiment. After the CT scanner CT-a creates the scan protocol, first, in step S1001, a scan protocol request is sent to the scan protocol management server 1 to examine the protocol. In order to facilitate the establishment of a prediction model or the like by the scan protocol management server 1, the examination image and the dose data may be transmitted together.
Next, the scanning protocol management server 1 displays the protocol reference standard surface and the predicted result of the scanning protocol for the viewer to view (step S1002), and the scanning protocol management server 1 screens for abnormal points using the protocol reference standard surface (step S1003). If it is determined that there is no abnormal point in the space (no in step S1004), the process advances to step S1006, where the scan protocol management server 1 approves the scan protocol and broadcasts the scan protocol to all CT scan apparatuses.
On the other hand, when it is determined that an abnormal point exists in the space (yes in step S1004), the routine proceeds to step S1005, where the scan protocol management server 1 adjusts the scan parameters until no abnormal point exists. Next, the adjusted scanning protocol is approved and issued to all CT scanning apparatuses (step S1006).
According to the embodiment, the remote server is utilized to uniformly control the scanning protocols, and the scanning devices of the same type can obtain the proper scanning protocols from the scanning protocol management server for application without creating the scanning protocols. Thereby enabling the entire CT protocol management system to be improved. In addition, the scanning protocol management server can more intuitively and conveniently find abnormality when approving and adjusting the scanning protocol, so that the efficiency of protocol examination is improved.
(fourth embodiment)
The scanning protocol adjusting device can also be installed on a local scanning device to perform local scanning protocol adjustment. Other examples of the combination of the scanning protocol adjusting apparatus and the CT protocol management system are described below with reference to fig. 11 and 12.
Fig. 11 is a schematic diagram of the configuration of a CT protocol management system in the fourth embodiment. The CT protocol management system includes a scan protocol management server 1 and a plurality of CT scanning apparatuses 2 of different types. For simplicity of explanation, two CT scanning devices 2 (CT-A and CT-B') are described. In the present embodiment, the scanning protocol adjusting device is installed in the CT scanning device CT-B'.
As shown in fig. 11, the scanning protocol management server 1 can perform remote communication with the CT scanner 2 by wireless. The scan protocol is created or modified in the CT scanner CT-a, which sends the new scan protocol to the scan protocol management server 1.
On the other hand, the scanning protocol management server 1 performs examination and approval of the scanning protocol, and broadcasts the approved scanning protocol to all CT scanning apparatuses. Any method may be adopted for the examination of the scanning protocol by the scanning protocol management server 1.
The CT scanner CT-B' which receives the scan protocol converts the received scan protocol into a scan protocol (scan parameter) suitable for its own type, and evaluates and adjusts the converted scan protocol. Specifically, the CT scanner CT-B' performs analysis of dose and image quality, identification of abnormal points, and adjustment of parameters as described in the first and second embodiments, evaluates or adjusts the scan protocol, and thereby applies the adjusted scan protocol.
Fig. 12 is a flowchart of a protocol management process of the CT protocol management system in the fourth embodiment. After the scan protocol management server 1 approves the scan protocol, the approved scan protocol is first transmitted to each CT scanning apparatus in step S1201.
Next, the CT scanning apparatus CT-B' converts the received scan protocol into a scan protocol adapted to its own model (step S1202), and calculates a prediction result of image quality and measurement using the converted scan parameters (step S1203), thereby performing screening of abnormal points using the protocol reference standard surface (step S1204). If it is determined that there is no abnormal point in the space (no in step S1205), the routine proceeds to step S1207, and the CT scanner CT-B' applies the scan protocol.
On the other hand, when it is determined that an abnormal point exists in the space (yes in step S1205), the routine proceeds to step S1206, and the CT scanner CT-B' adjusts the scan parameters until no abnormal point exists. Next, the CT scanner CT-B' applies the scan protocol (step S1207).
According to the present embodiment, the local scanning device can adjust the converted scanning protocol so as to be more suitable for the own scanning device. Thus, the management performance of the CT protocol management system mixed with different types of scanning devices can be improved. In addition, when the CT scanning device CT-B' adjusts the scanning protocol, the abnormality can be found more intuitively and conveniently, and the efficiency of protocol examination is improved.
In the description of the first and second embodiments described above, each component of each illustrated apparatus is a functional conceptual component, and it is not necessarily required to be physically configured as illustrated. That is, the specific manner of dispersing or integrating the respective devices is not limited to the illustration, and all or a part of the devices may be functionally or physically dispersed or integrated in any unit according to various loads, use conditions, and the like. Further, all or any part of the processing functions performed by the respective devices are realized by a CPU (central processing unit) and a program that is analyzed and executed by the CPU, or realized as hardware based on wired logic (wired logic).
In the above embodiments, the scanning protocol adjusting device may be implemented by a personal computer having a processor and a memory, a workstation, or other computer. At this time, a program capable of realizing each module of the scanning protocol adjusting apparatus is stored in the memory, and the scanning protocol adjusting apparatus is realized by calling the program by the processor.
The program can be distributed via a network such as the internet. The program may be recorded on a recording medium readable by a computer, such as a hard disk, a Flexible Disk (FD), or a CD-ROM, MO, DVD, and may be read from the recording medium by the computer to be executed.
While several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.
Claims (20)
1. A scanning protocol adjustment apparatus, comprising:
a protocol reference standard plane drawing unit that calculates and draws a protocol reference standard plane as a reference standard in a space in which each evaluation parameter is displayed as a dimension, based on a predetermined range of the evaluation parameter used when evaluating the scanning protocol;
a scan protocol evaluation parameter prediction unit for predicting the evaluation parameters corresponding to the scan protocol to obtain an evaluation parameter prediction result;
a mapping unit configured to map the result of the evaluation parameter prediction to the space; and
and an evaluation adjustment unit configured to evaluate or adjust the scanning protocol based on a positional relationship between the evaluation parameter prediction result and the protocol reference standard plane.
2. The scan protocol adjusting apparatus according to claim 1, wherein the protocol reference standard plane drawing unit draws the protocol reference standard plane using a plurality of evaluation parameters each representing a scan dose and an image quality as dimensions.
3. The scanning protocol adjustment apparatus of claim 2 wherein the evaluation parameters indicative of image quality are spatial resolution and contrast-to-noise ratio.
4. The scan protocol adjusting apparatus according to claim 1, wherein the scan protocol includes one of a tube current, a tube voltage, and a pitch.
5. The scan protocol adjusting apparatus according to claim 1, wherein the protocol reference standard plane drawing unit determines a reasonable range of the evaluation parameter indicated by the diagnostic performance model, which indicates a relationship between the evaluation parameter and the diagnostic performance, as the predetermined range, based on a diagnostic performance model.
6. The scan protocol adjusting apparatus according to claim 1, wherein the number of the evaluation parameters is 3 or more, so that the space is a space of three or more dimensions.
7. The scan protocol adjusting apparatus according to claim 6, wherein the protocol reference standard plane drawing unit obtains history check data of the evaluation parameter, and draws a closed curved surface surrounding the history check data in the space as the protocol reference standard plane.
8. The scanning protocol adjustment apparatus of claim 6 wherein,
the protocol reference standard forms a surface surrounding the enclosed space in the space,
when the estimated parameter prediction result is not located in the closed space surrounded by the protocol reference standard plane, the estimation adjustment unit adjusts the scan protocol based on the position of an abnormal point, using the estimated parameter prediction result as the abnormal point.
9. The scanning protocol adjustment apparatus of claim 8 wherein,
the evaluation adjustment unit moves the abnormal point into the closed space, and adjusts the scan protocol based on the evaluation parameter corresponding to the moved abnormal point.
10. The scanning protocol adjustment apparatus of claim 1 wherein,
the evaluation adjustment unit includes a receiving unit that receives a movement operation of the evaluation parameter prediction result,
the evaluation adjustment unit adjusts the scan protocol based on the evaluation parameter corresponding to the moved evaluation parameter prediction result.
11. The scanning protocol adjustment apparatus of claim 1 wherein,
the evaluation adjustment unit includes a receiving unit that receives input of an evaluation parameter by a user,
the evaluation adjustment unit adjusts the scanning protocol according to the evaluation parameters input by the user.
12. The scan protocol adjusting apparatus according to any one of claims 1, 7, and 8, further comprising a guidance information display unit that displays guidance information for guiding a user when the mapping unit maps the evaluation parameter prediction result to the space.
13. The scan protocol adjusting apparatus according to claim 12, wherein the instruction information is information on a position of a movement destination of the map point corresponding to the result of the estimation parameter prediction in the space.
14. The scanning protocol adjusting apparatus according to claim 13, wherein the instruction information is coordinate information related to a position of the moving destination.
15. The scan protocol adjusting apparatus according to claim 13 or 14, wherein the instruction information display section displays the position of the moving destination in space based on information on the position of the moving destination.
16. The scan protocol adjusting apparatus according to claim 1, wherein the scan protocol adjusting apparatus is located in a scan protocol management server or a medical scan apparatus.
17. The scan protocol adjusting apparatus according to claim 1, further comprising a prediction model creation section for creating a prediction model for predicting a prediction result of the evaluation parameter based on the scan parameter and the history data of the patient information,
the scan protocol evaluation parameter prediction unit obtains an evaluation parameter corresponding to the scan protocol as an evaluation parameter prediction result by using the prediction model established by the prediction model establishment unit.
18. The scan protocol adjusting apparatus according to claim 1, wherein the scan protocol adjusting apparatus is located in a scan protocol management server, the scan protocol management server receives a scan protocol from a medical scan apparatus and broadcasts the adjusted scan protocol to the medical scan apparatus and other medical scan apparatuses.
19. The scan protocol adjusting apparatus according to claim 1, wherein the scan protocol adjusting apparatus is provided in a medical scan apparatus, the medical scan apparatus receives a scan protocol from a scan protocol management server and converts the scan protocol into a scan protocol suitable for its own model,
the scanning protocol adjusting device evaluates or adjusts the converted scanning protocol by using the protocol reference standard plane.
20. A scanning protocol adjustment method, comprising:
a protocol reference standard plane drawing step of calculating and drawing a protocol reference standard plane as a reference standard in a space in which each evaluation parameter is displayed as a dimension, based on a prescribed range of the evaluation parameter used when evaluating the scanning protocol;
a scanning protocol evaluation parameter prediction step, namely predicting the evaluation parameters corresponding to the scanning protocol to obtain an evaluation parameter prediction result;
a mapping step of mapping the result of the evaluation parameter prediction to the space; and
and evaluating and adjusting the scanning protocol according to the position relation between the evaluation parameter prediction result and the protocol reference standard surface.
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| JP5792733B2 (en) * | 2009-10-22 | 2015-10-14 | コーニンクレッカ フィリップス エヌ ヴェ | Acquisition protocol evaluation device |
| CN103118597B (en) * | 2010-09-07 | 2015-10-07 | 株式会社日立医疗器械 | X ray CT device and tube current determining method |
| KR20140082721A (en) * | 2011-09-30 | 2014-07-02 | 칠드런즈 호스피탈 메디칼 센터 | Method for consistent and verifiable optimization of computed tomography(ct) radiation dose |
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| JP2018038807A (en) * | 2016-09-06 | 2018-03-15 | キヤノンメディカルシステムズ株式会社 | Medical image diagnostic apparatus |
| CN108922600A (en) * | 2018-06-29 | 2018-11-30 | 上海联影医疗科技有限公司 | Scan protocols comparative approach and device, image processing apparatus, readable storage medium storing program for executing |
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