CN111012371A - CT scanning image building method and CT scanning image building device - Google Patents
CT scanning image building method and CT scanning image building device Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for CT scanning image building. The method comprises the following steps: carrying out plain film positioning scanning on an object to be detected to obtain a CT positioning film; determining a positioning frame with an expected shape according to the shape of a part to be scanned of an object to be checked in the CT positioning film so as to enable the part to be scanned to be positioned in the positioning frame; carrying out tomography or helical scanning on a part to be scanned of the inspected object according to the positioning frame with the expected shape to obtain scanning data; and performing CT image reconstruction based on the scan data. The embodiment of the invention can effectively reduce the radiation dose of the inspected object.
Description
Technical Field
The embodiment of the invention relates to the technical field of medical equipment, in particular to a method and a device for CT scanning image building.
Background
In order to obtain the actual position to be scanned, a flat-slice positioning scan is generally performed during CT (Computed Tomography) clinical scanning. Before the flat sheet positioning scanning, a user can set parameters such as scanning position, length, bulb position and the like to meet the scanning diagnosis requirements of diseases. The planar slice positioning scan is also called as the spacer scan and is divided into 90-degree and 180-degree planar slices. CT scout strips refer to placing the X-ray tube at a desired angle (normal or lateral), holding the detector stationary, and automatically feeding the patient into the gantry and performing a series of X-ray exposures as the couch moves. The doctor can select the inclined angle of the frame according to the positioning sheet, mark the position, the angle, the layer thickness and the like to be scanned on the positioning sheet by using a positioning line, and execute subsequent functional scanning such as fault or spiral and the like according to the adjusted parameters. Therefore, the CT plain film positioning scanning has great guiding significance for subsequent scanning.
The positioning line is a view of the scanning image-building parameters, can correctly draw a scanning range in combination with the plain film positioning scanning process, and intuitively displays information such as scanning positions for doctors. Generally, a doctor can easily modify scanning parameters such as a scanning starting position, an ending position, an image-building view field, an image-building center and the like by simply dragging a mouse and adjusting the position of a positioning line. The scanning range drawn by the positioning line is the positioning frame, and the image area marked by the positioning frame is usually rectangular, that is, the rectangular positioning frame is used for positioning before CT scanning at present.
However, the rectangular positioning frame mode lacks flexibility for the scanning process and the imaging process.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for CT scanning image building, which have flexibility.
One aspect of the embodiments of the present invention provides a method for CT scan imaging, which includes: carrying out plain film positioning scanning on an object to be detected to obtain a CT positioning film; determining a positioning frame with an expected shape according to the shape of the part to be scanned of the checked object in the CT positioning film so as to enable the part to be scanned to be positioned in the positioning frame; carrying out tomography or helical scanning on the part to be scanned of the inspected object according to the positioning frame with the expected shape to obtain scanning data; and performing CT image reconstruction based on the scan data.
Further, determining the desired shape of the positioning frame includes: and manually drawing a positioning frame with the expected shape according to the shape of the part to be scanned in the CT positioning sheet.
Further, determining the desired shape of the positioning frame includes: and automatically identifying the shape characteristics of the part to be scanned according to the shape of the part to be scanned in the CT locating plate, and automatically drawing a locating frame with the expected shape according to the shape characteristics of the part to be scanned.
Further, the desired-shape positioning frame includes an irregular positioning frame, and the shape of the irregular positioning frame depends on the shape of the part to be scanned of the object to be examined.
Further, the part to be scanned includes a plurality of parts, and the method further includes: and determining the irregular positioning frame covering the parts to be scanned according to the shapes of the parts to be scanned.
Further, the method further comprises: determining a reconstructed field of view from the irregular positioning box, wherein performing CT image reconstruction based on the scan data comprises performing CT image reconstruction based on the reconstructed field of view, a reconstruction center, and the scan data.
Further, the method further comprises: and adjusting the position of the reconstruction center according to the irregular positioning frame.
In another aspect, an apparatus for CT scan imaging is provided, which includes a first scanning unit, a positioning frame determining unit, a second scanning unit, and an image reconstructing unit. The first scanning unit is used for carrying out plain film positioning scanning on the object to be detected to obtain a CT positioning film. The positioning frame determining unit determines a positioning frame with a desired shape according to the shape of the part to be scanned of the checked object in the CT positioning film so that the part to be scanned is positioned in the positioning frame. The second scanning unit performs tomographic scanning or helical scanning on the part to be scanned of the object to be examined according to the positioning frame of the desired shape, and obtains scanning data. The image reconstruction unit performs CT image reconstruction based on the scan data.
Further, the positioning frame determination unit includes an identification unit and an automatic drawing unit. The identification unit is used for automatically identifying the shape characteristics of the part to be scanned of the checked object according to the shape of the part to be scanned in the CT locating film. The automatic drawing unit is used for automatically drawing a positioning frame with an expected shape according to the recognized shape characteristics of the part to be scanned.
Further, the positioning frame determination unit includes a receiving unit. The receiving unit is used for receiving a positioning frame with an expected shape manually drawn by a user according to the shape of the part to be scanned of the checked object in the CT positioning sheet.
Further, the desired-shape positioning frame includes an irregular positioning frame, and the shape of the irregular positioning frame depends on the shape of the part to be scanned of the object to be examined.
Further, the apparatus further comprises a reconstruction view field determination unit. The reconstruction view field determining unit determines a reconstruction view field according to the irregular positioning frame, wherein the image reconstruction unit performs CT image reconstruction based on the reconstruction view field, a reconstruction center and the scan data.
Further, the apparatus further comprises a reconstruction center adjustment unit. The reconstruction center adjusting unit adjusts the position of the reconstruction center according to the irregular positioning frame.
According to the CT scanning image building method and the CT scanning image building device, the expected shape of the positioning frame can be determined according to the shape characteristics of the target area by introducing the positioning frame with the expected shape into the scanning image building process, and the part to be scanned is defined in the positioning frame without being limited to the existing rectangle, so that the CT scanning image building method and the CT scanning image building device have high flexibility. When scanning and paying off, the slice gate can be adaptively adjusted along with the shape of the irregular positioning frame, so that the radiation dose of the object to be detected is reduced.
Moreover, the image-building visual field and the image-building center can be adaptively adjusted during image building, so that the reconstruction visual field is reduced, the reconstruction data volume is reduced, and the image building performance is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional rectangular positioning frame;
FIG. 2 is a flow chart of a method of CT scan imaging according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of several irregular positioning frames;
FIG. 4 is a schematic view of CT detection of an object under examination;
FIG. 5 is a schematic diagram of an irregular positioning frame of the present invention compared with a conventional rectangular positioning frame;
FIG. 6 is a schematic view of the shape of an irregular positioning box determined based on the heart;
FIG. 7 is a step of one embodiment of the positioning block shown in FIG. 2 to determine a desired shape;
FIG. 8 is a schematic diagram of an adjusted reconstruction center;
fig. 9 is a schematic block diagram of an apparatus for CT scan imaging according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be noted that, in order to better embody the innovation of the present invention, only the structural features closely related to the creation point of the present invention are shown and described in the drawings and the description of the present invention, and other structural features for CT scan imaging are not shown or described in detail in the drawings or the description of the present invention in order to avoid complexity.
Fig. 1 discloses a schematic diagram of a conventional rectangular positioning frame L1. Currently, CT topograms use a regular rectangular frame pattern as shown in FIG. 1. The rectangular positioning box L1 is implemented by marking the scanning range with a rectangle on the part of the patient to be scanned, the part of the patient in the scanning range will be irradiated by X-ray, the corresponding scanning data will participate in the reconstruction, and the scanning field of view and the reconstruction field of view are the same no matter the positive position film or the side position film.
The inflexibility of the rectangular positioning frame mode mainly has the following aspects:
firstly, a target part to be scanned can be defined only by a rectangular circle, and targeted positioning cannot be carried out according to the specific shape of a target area;
secondly, the body parts needing to be covered in the scanning process are all defined in a rectangular positioning frame, so that a plurality of patient parts which are meaningful for diagnosis can not be defined independently without sensitive organs or body parts irrelevant to disease diagnosis;
thirdly, the part of the patient in the rectangular positioning frame is irradiated by X-rays, so that the patient is subjected to excessive radiation dose;
and fourthly, the scanning data in the initial scanning position and the end scanning position marked by the rectangular positioning frame participate in image building subsequently, an image sequence of the patient is generated, and the scanning data corresponding to the body part irrelevant to diagnosis is also reconstructed, so that the image building performance is influenced.
During one scanning process, the rectangular positioning frame can not only select the part of the patient which is actually effective for the diagnosis of the doctor, for example, the part of the heart of the patient to be scanned can jointly scan other body tissues around the heart; the region of the patient's liver is scanned in conjunction with other body tissues surrounding the liver, so that body regions not relevant for diagnosing disease are also irradiated with X-rays, and the scanned data includes regions not useful for diagnosis and also portions not useful for diagnosis are also involved in image creation.
In view of this, the embodiment of the present invention provides an improved solution.
FIG. 2 is a flow chart of a method for CT scan imaging according to an embodiment of the present invention. As shown in fig. 2, the method for CT scan imaging according to an embodiment of the present invention includes steps S11 to S14.
In step S11, a plain film scout scan is performed on the object to be examined, and CT scout films are obtained.
In step S12, a positioning frame of a desired shape is determined based on the shape of the part to be scanned of the object to be examined in the CT spacer so that the part to be scanned is located in the positioning frame.
In some embodiments, the desired shape of the positioning box comprises an irregular positioning box. The shape of the irregular positioning frame depends on the shape of the portion to be scanned of the object to be inspected. The irregular positioning frame of the invention marks the scanning range by any irregular figure, and the irregular figure can be any polygon or a figure customized by a user. The essential purpose of the irregular positioning frame is to circle out the scanning range which covers all the parts to be scanned and reduces other irrelevant parts as much as possible according to the shape of the parts to be scanned.
Fig. 3 shows some schematic diagrams of the irregular positioning frame, and the shape of the irregular positioning frame may include, for example, a trapezoid, an irregular pentagon, an irregular hexagon, an arbitrary irregular polygon, an ellipse, an irregular ellipse, and so on. However, the shape of the irregular positioning frame in the embodiment of the present invention is not limited thereto, and in other embodiments, the irregular positioning frame in the embodiment of the present invention may also include positioning frames with other shapes. It is within the scope of the invention that the desired shape of the positioning frame be determined based on the shape of the part to be scanned.
As shown in fig. 2, in step S13, a tomographic scan or a helical scan is performed on the portion to be scanned of the object to be examined according to the determined positioning frame of the desired shape, and scan data is obtained.
In step S14, CT image reconstruction is performed based on the scan data.
Fig. 4 shows a schematic diagram of CT detection of an object to be detected, and fig. 5 is a schematic diagram of a comparison between an irregular positioning frame of the present invention and a conventional rectangular positioning frame. Referring to fig. 4 and 5 in combination, if the existing rectangular positioning frame is used, the positioning range of the CT positioning sheet is shown as a rectangle L1. When the X-ray source 10 detects the object 20, the irradiation range of the X-ray is as the range marked by the A-A line. If the irregular positioning frame of the embodiment of the present invention is used, the positioning range of the CT positioning sheet is shown in a trapezoid L2, for example. When the X-ray source 10 detects the object 20, the irradiation range of the X-ray is as the range marked by the B-B line.
Therefore, as can be seen from fig. 4 and 5, in the conventional CT scanning mode, there are regions in the scanning range in the rectangular positioning frame mode that are not of interest for the doctor to diagnose, and these extraneous regions are also irradiated with the X-ray during the scanning, so that the radiation dose of the patient is increased. However, with the irregular positioning frame mode of the present invention, the irregular shape can be set according to the size and shape of the scanning portion and according to the diagnosis requirement, and the target scanning portion can be covered in the positioning frame, and the portion irrelevant to the diagnosis can be excluded from the positioning frame. During scanning, the slice gate can be adaptively adjusted along with the shape of the irregular positioning sheet, so that the scanning field of view can be adaptively adjusted along with the shape of the positioning sheet, and the radiation dose of an object to be detected in the scanning process can be reduced.
For example, FIG. 6 discloses a schematic shape diagram of an irregular positioning box determined based on the heart. As shown in fig. 6, in the CT detection, if the heart region 21 of the examined object needs to be scanned, a desired positioning frame shape can be determined according to the structural shape of the heart region 21, as shown by an irregular positioning frame L2 in fig. 6, so as to circle the heart region 21 within the positioning frame L2 and reduce the regional scope of other irrelevant regions as much as possible.
FIG. 7 discloses the detailed steps of determining a desired shape of the positioning frame according to one embodiment of the present invention. As shown in fig. 7, in one embodiment, the desired shape of the positioning frame may be automatically recognized by the system, in which case, determining the desired shape of the positioning frame may include steps S121 and S122.
In step S121, the shape characteristics of the to-be-scanned region are automatically identified according to the shape of the to-be-scanned region in the CT positioning film.
In step S122, an irregular positioning frame is automatically drawn according to the shape characteristics of the portion to be scanned.
In another embodiment, the positioning frame of the desired shape may also be performed manually, in which case, determining the positioning frame of the desired shape may include: and manually drawing an irregular positioning frame according to the shape of the part to be scanned in the CT positioning sheet, and delineating the part to be scanned in the positioning frame.
In some embodiments, when the portion to be scanned includes a plurality of regions, the method for CT scan imaging may further include: and determining an irregular positioning frame covering the parts to be scanned according to the shapes of the parts to be scanned.
For example, a physician may scan a heart site, a liver site, and the abdomen during a single scan. In this case, if the existing rectangular positioning frame mode is adopted, the diagnostic regions need to be combined into a rectangle to adjust parameters such as the scanning start position and the scanning end position, and scan and image creation are performed, which undoubtedly includes other regions irrelevant to diagnosis in the rectangular positioning frame, thereby increasing the scanning field of view and increasing the radiation dose. However, if the irregular positioning frame mode of the present invention is adopted, the irregular shape can be set according to the size and shape of the scanning part and according to the diagnosis requirement, the target scanning part is covered in the positioning frame, and the part irrelevant to the diagnosis is excluded from the irregular positioning frame, so the scanning field of view is greatly reduced, and the radiation dose is reduced.
Referring back to fig. 2, in some embodiments, the method of CT scan imaging further includes step S15. In step S15, a reconstructed field of view is determined from the irregular positioning box. The CT image reconstruction based on the scan data in step S14 includes performing CT image reconstruction based on the reconstructed view field, the reconstruction center, and the scan data determined in step S15.
The amount of scan data in the rectangular positioning frame mode is significantly larger than in the irregular positioning frame mode, and therefore, the imaging time is longer accordingly. If the mode of the irregular positioning frame is used, scanning data are acquired aiming at the region which is interested by the user, and only the region which is interested by the user is imaged during reconstruction. The reconstruction visual field can be adjusted along with the range of the mark of the irregular positioning frame, so that the reconstruction range can be adjusted, the calculated amount is reduced, and the reconstruction performance is optimized.
When the irregular positioning frame is adopted, the scanning data volume is reduced compared with the situation of the rectangular positioning frame, and the data volume of a part of image building can be naturally reduced; meanwhile, if the image-building visual field is adjusted, the data volume of the image building can be further reduced. Therefore, the CT scanning image building method has the advantages of being small in image building data volume, capable of improving image building speed and the like.
In other embodiments, the method for CT scan imaging further includes step S16. In step S16, the position of the reconstruction center is adjusted according to the irregular positioning box. In this case, the CT image reconstruction in step S14 may include performing CT image reconstruction based on the adjusted reconstruction center.
Fig. 8 discloses a schematic view of the adjusted reconstruction center. As shown in fig. 8, during imaging, the reconstruction center may not be changed, for example, the position marked by the line M1; the reconstruction center can also be adjusted to the position as indicated by the line M2 following the shape of the irregular positioning box L2.
According to the CT scanning image building method, the irregular positioning frame is introduced into the scanning image building process, the shape of the irregular positioning frame can be determined according to the shape characteristics of the target area, the part to be scanned is defined in the positioning frame, the method is not limited to the existing rectangle, and the method has high flexibility. When scanning and paying off, the slice gate can be adaptively adjusted along with the shape of the irregular positioning frame, so that the radiation dose of the object to be detected is reduced.
In addition, the image-building visual field and the image-building center can be adaptively adjusted during image building by the CT scanning image-building method, so that the reconstructed visual field is reduced, the reconstructed data volume is reduced, and the image building performance is improved.
Fig. 9 discloses a schematic block diagram of an apparatus 30 for CT scan imaging according to an embodiment of the present invention. As shown in fig. 9, the apparatus 30 for CT scan image reconstruction according to an embodiment of the present invention includes a first scanning unit 31, a positioning frame determining unit 32, a second scanning unit 33, and an image reconstructing unit 34. The first scanning unit 31 can perform plain film scout scan on the object to be inspected to obtain a CT scout film. The positioning frame determination unit 32 can determine a positioning frame with a desired shape according to the shape of the part to be scanned of the object to be examined in the CT scout scan so that the part to be scanned is located in the positioning frame. The desired-shape positioning frame includes an irregular positioning frame, and the shape of the irregular positioning frame depends on the shape of the portion to be scanned of the object to be inspected. The second scanning unit 33 may perform tomographic scanning or helical scanning of a portion to be scanned of the object to be inspected according to a positioning frame of a desired shape, obtaining scan data. The image reconstruction unit 34 may perform CT image reconstruction based on the scan data.
In some embodiments, the positioning frame determination unit 32 may include a recognition unit 321 and an automatic drawing unit 322. The recognition unit 321 can automatically recognize the shape characteristics of the part to be scanned according to the shape of the part to be scanned of the object to be examined in the CT localizer. The automatic drawing unit 322 may automatically draw a positioning frame of a desired shape according to the shape characteristics of the identified portion to be scanned.
In other embodiments, the positioning frame determination unit 32 may include the receiving unit 324. The receiving unit 324 may receive a positioning frame of a desired shape manually drawn by a user according to the shape of a part to be scanned of an object to be examined in a CT spacer.
The apparatus 30 for CT scan imaging according to the embodiment of the present invention further includes a reconstruction field of view determination unit 35. The reconstructed view determining unit 35 may determine the reconstructed view according to the irregular positioning frame. The image reconstruction unit 35 may perform CT image reconstruction based on the reconstructed view field, the reconstruction center, and the scan data.
In some embodiments, the apparatus 30 for CT scan imaging may further include a reconstruction center adjusting unit 36. The reconstruction center adjusting unit 36 may adjust the position of the reconstruction center according to the irregular positioning frame. The image reconstruction unit 34 may perform CT image reconstruction according to the adjusted reconstruction center.
The device for CT scanning image building in the embodiment of the present invention has similar beneficial technical effects to the above-mentioned method for CT scanning image building, and therefore, the details are not repeated herein.
The method for CT scan image building and the apparatus for CT scan image building provided by the embodiments of the present invention are described in detail above. The method for CT scan imaging and the apparatus for CT scan imaging according to the embodiments of the present invention are described herein by using specific examples, and the above description of the embodiments is only for assisting understanding of the core ideas of the present invention, and is not intended to limit the present invention. It should be noted that, for those skilled in the art, various improvements and modifications can be made without departing from the spirit and principle of the present invention, and these improvements and modifications should fall within the scope of the appended claims.
Claims (13)
1. A method for image building in CT scanning is characterized in that: it includes:
carrying out plain film positioning scanning on an object to be detected to obtain a CT positioning film;
determining a positioning frame with an expected shape according to the shape of the part to be scanned of the checked object in the CT positioning film so as to enable the part to be scanned to be positioned in the positioning frame;
carrying out tomography or helical scanning on the part to be scanned of the inspected object according to the positioning frame with the expected shape to obtain scanning data; and
and reconstructing a CT image based on the scanning data.
2. The method of claim 1, wherein: determining the desired shape of the positioning frame includes:
and manually drawing a positioning frame with the expected shape according to the shape of the part to be scanned in the CT positioning sheet.
3. The method of claim 1, wherein: determining the desired shape of the positioning frame includes:
and automatically identifying the shape characteristics of the part to be scanned according to the shape of the part to be scanned in the CT locating plate, and automatically drawing a locating frame with the expected shape according to the shape characteristics of the part to be scanned.
4. The method of claim 1, wherein: the expected-shape positioning frame comprises an irregular positioning frame, and the shape of the irregular positioning frame depends on the shape of the part to be scanned of the checked object.
5. The method of claim 4, wherein: the part to be scanned comprises a plurality of parts, and the method further comprises the following steps:
and determining the irregular positioning frame covering the parts to be scanned according to the shapes of the parts to be scanned.
6. The method of claim 4, wherein: it still includes:
determining a reconstructed field of view from the irregular positioning frame,
wherein performing CT image reconstruction based on the scan data comprises performing CT image reconstruction based on the reconstruction field of view, a reconstruction center, and the scan data.
7. The method of claim 6, wherein: it still includes:
and adjusting the position of the reconstruction center according to the irregular positioning frame.
8. An image-building device for CT scanning is characterized in that:
the first scanning unit is used for carrying out plain film positioning scanning on the object to be detected to obtain a CT positioning film;
a positioning frame determining unit which determines a positioning frame with a desired shape according to the shape of the part to be scanned of the checked object in the CT positioning film so that the part to be scanned is positioned in the positioning frame;
a second scanning unit that performs tomographic scanning or helical scanning on a portion to be scanned of the object to be inspected according to the positioning frame of the desired shape, obtaining scanning data; and
and an image reconstruction unit which performs CT image reconstruction based on the scan data.
9. The apparatus of claim 8, wherein: the positioning frame determination unit includes:
the identification unit is used for automatically identifying the shape characteristics of the part to be scanned of the checked object according to the shape of the part to be scanned in the CT locating film; and
and the automatic drawing unit is used for automatically drawing a positioning frame with an expected shape according to the recognized shape characteristics of the part to be scanned.
10. The apparatus of claim 8, wherein: the positioning frame determination unit includes:
and the receiving unit is used for receiving a positioning frame with a desired shape manually drawn by a user according to the shape of the part to be scanned of the checked object in the CT positioning sheet.
11. The apparatus of claim 8, wherein: the expected-shape positioning frame comprises an irregular positioning frame, and the shape of the irregular positioning frame depends on the shape of the part to be scanned of the checked object.
12. The apparatus of claim 11, wherein: it still includes:
a reconstructed view determining unit that determines a reconstructed view from the irregular positioning frame,
wherein the image reconstruction unit performs CT image reconstruction based on the reconstruction field of view, a reconstruction center, and the scan data.
13. The apparatus of claim 12, wherein: it still includes:
a reconstruction center adjusting unit that adjusts a position of the reconstruction center according to the irregular positioning frame.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111991019A (en) * | 2020-08-14 | 2020-11-27 | 北京大学深圳医院 | CT scanning bed effective scanning range identification method, device, equipment and storage medium |
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