CN112221022A - Imaging system, method and radiotherapy system - Google Patents

Imaging system, method and radiotherapy system Download PDF

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CN112221022A
CN112221022A CN202011018090.9A CN202011018090A CN112221022A CN 112221022 A CN112221022 A CN 112221022A CN 202011018090 A CN202011018090 A CN 202011018090A CN 112221022 A CN112221022 A CN 112221022A
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flat panel
panel detector
offset
imaging
bulb
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闫浩
李金升
陈方正
李大梁
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Our United Corp
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Our United Corp
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Priority to US17/483,409 priority patent/US20220087632A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N5/1048—Monitoring, verifying, controlling systems and methods
    • A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/12—Arrangements for detecting or locating foreign bodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4208—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
    • A61B6/4233—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using matrix detectors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
    • A61B6/5205—Devices using data or image processing specially adapted for radiation diagnosis involving processing of raw data to produce diagnostic data
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N5/1048—Monitoring, verifying, controlling systems and methods
    • A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
    • A61N2005/1061—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam using an x-ray imaging system having a separate imaging source
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N2005/1092—Details

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Abstract

The embodiment of the application provides an imaging system, a method and a radiotherapy system, wherein the imaging system is used for imaging a patient and comprises: the X-ray detector comprises a bulb tube and a flat panel detector, wherein the bulb tube and the flat panel detector are arranged oppositely, the bulb tube emits X rays, the flat panel detector detects the X rays to generate image data, and the geometric center of the flat panel detector has offset relative to the orthographic projection of the focus of the bulb tube on the flat panel detector. The imaging accuracy obtained according to the image data is better, and the image guiding effect in tumor treatment is improved.

Description

Imaging system, method and radiotherapy system
Technical Field
The present application relates to the field of imaging technologies, and in particular, to an imaging system, an imaging method, and a radiation therapy system.
Background
In the technical field of imaging, a bulb tube emits X rays, a flat panel detector detects the X rays emitted by the bulb tube to generate image data, and a tumor treatment device treats tumors in imaging according to images obtained by the image data. However, in general, the imaging system has the problems that the edge image data obtained according to the image data is fuzzy, the imaging accuracy is poor, and the effect of tumor treatment is influenced.
Disclosure of Invention
An object of the present invention is to provide an imaging system, a method and a radiation therapy system, which overcome all or part of the problems of the prior art.
An embodiment of the present application provides an imaging system, configured to image a patient, including: the X-ray detector comprises a bulb tube and a flat panel detector, wherein the bulb tube and the flat panel detector are arranged oppositely, the bulb tube emits X rays, the flat panel detector detects the X rays to generate image data, and the geometric center of the flat panel detector has offset relative to the orthographic projection of the focus of the bulb tube on the flat panel detector.
In a specific embodiment of the present application, the mounting position of the bulb and/or the flat panel detector or the motion device of the flat panel detector causes the geometric center of the flat panel detector to have an offset relative to the orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, the movement means may implement a translational movement or a rotational movement.
In a specific embodiment of the present application, the motion device sends an offset amount generated by the motion to an interface of a corresponding forward projection algorithm to generate corresponding image data.
In a specific embodiment of the present application, the algorithm comprises a simulated orthographic projection algorithm or a reconstruction algorithm.
In a specific embodiment of the present application, the geometric center of the flat panel detector is offset in the head and foot direction of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, the geometric center of the flat panel detector is offset in the direction of the patient's foot with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, a geometric center of the flat panel detector has a first offset toward a foot of a patient with respect to an orthographic projection of a focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, a geometric center of the flat panel detector is shifted away from the imaging region of interest with respect to a forward projection of the focal point of the bulb onto the flat panel detector.
In a specific embodiment of the present application, if the imaging region of interest is located on the head of the patient, the geometric center of the flat panel detector has a second offset toward the foot of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, if the imaging region of interest is located on a body part of the patient, the geometric center of the flat panel detector has a third offset towards a direction opposite to the body part of the patient with respect to a forward projection of the focal point of the bulb onto the flat panel detector.
In a specific embodiment of the present application, the geometric centers of the imaging region of interest and the flat panel detector are respectively located at different sides of an orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 3/4 of the length or the width of the flat panel detector.
In a specific embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 1/2 of the length or the width of the flat panel detector.
In a specific embodiment of the present application, the first offset amount, the second offset amount, or the third offset amount is less than or equal to 200 mm.
In a specific embodiment of the present application, the first offset amount, the second offset amount, or the third offset amount is less than or equal to 100 mm.
The present application further provides a radiation therapy system comprising a tumor therapy device and an imaging system as described in any of the above embodiments.
In a particular embodiment of the application, the imaging region of the imaging system at least partially coincides with the treatment region of the tumor treatment device.
The application also provides an imaging method, which is applied to a bulb tube and a flat panel detector which are oppositely arranged, and the method comprises the following steps:
the bulb tube emits X-rays, and the orthographic projection of the focus of the bulb tube on the flat panel detector has an offset with the geometric center of the flat panel detector;
the flat panel detector detects the X-ray generated image data.
In a specific embodiment of the present application, the detecting the X-ray generated image data by the flat panel detector includes:
acquiring the offset;
and generating corresponding image data according to the offset and a corresponding orthographic projection algorithm.
In a specific embodiment of the present application, the generating corresponding image data according to the offset and a corresponding forward projection algorithm includes:
generating a corresponding imaging mode according to the offset;
and generating corresponding image data according to the imaging mode and an algorithm corresponding to the imaging mode.
In a specific embodiment of the present application, the geometric center of the flat panel detector is offset in the head and foot direction of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, the orthogonal projection of the geometric center of the flat panel detector on the flat panel detector relative to the focal point of the bulb is biased toward the foot of the patient.
In a specific embodiment of the present application, a geometric center of the flat panel detector has a first offset with respect to an orthographic projection of a focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, a geometric center of the flat panel detector is shifted away from the imaging region of interest with respect to a forward projection of the focal point of the bulb onto the flat panel detector.
In a specific embodiment of the present application, if the imaging region of interest is located on the head of the patient, the geometric center of the flat panel detector has a second offset toward the foot of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, if the imaging region of interest is located on a body part of the patient, the geometric center of the flat panel detector has a third offset towards a direction opposite to the body part of the patient with respect to a forward projection of the focal point of the bulb onto the flat panel detector.
In a specific embodiment of the present application, the geometric centers of the imaging region of interest and the flat panel detector are respectively located at different sides of an orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 3/4 of the length or the width of the flat panel detector.
In a specific embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 1/2 of the length or the width of the flat panel detector.
According to the technical scheme, the imaging system comprises the bulb tube for emitting X rays and the flat panel detector for detecting the X rays to generate image data, the geometric center of the flat panel detector is offset relative to the orthographic projection of the focus of the bulb tube on the flat panel detector, and therefore the situation that the partial edge image data quality obtained by the flat panel detector according to the image data is poor due to the fact that the orthographic projection of the X rays on the flat panel detector is overlapped with the geometric center of the flat panel detector can be avoided. The imaging accuracy obtained according to the image data is better, and the image guiding effect in tumor treatment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic view of a typical imaging system;
FIG. 2 is a schematic view of an imaging system according to an embodiment of the present application;
FIG. 3 is a schematic view of an imaging system according to another embodiment of the present application;
FIG. 4 is a schematic view of an imaging system according to yet another embodiment of the present application;
FIG. 5 is a flow chart of an imaging method according to an embodiment of the present application;
FIG. 6 is a flowchart of step 502 of an imaging method according to another embodiment of the present application;
fig. 7 is a flowchart illustrating step 5022 of an imaging method according to yet another embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application shall fall within the scope of the protection of the embodiments in the present application.
Referring to fig. 1, in general, an imaging system includes: the bulb 11 and the flat panel detector 12 are arranged opposite to each other, the bulb 11 emits X-rays, the flat panel detector 12 detects the X-rays to generate image data, the orthographic projection range of the X-rays emitted by the bulb 11 on the flat panel detector 12 is defined by a ray radius range B1 towards the head of the patient and a ray radius range B2 towards the feet of the patient, the ray radius range B1 towards the head of the patient and the ray radius range B2 towards the feet of the patient are equal, the orthographic projection of the focus of the bulb 11 on the flat panel detector 12 is coincident with the geometric center of the flat panel detector 12, and partial edge image data detected by the flat panel detector 12 is blurred, so that the imaging accuracy obtained according to the image data is poor, and the tumor treatment effect is affected.
Referring to fig. 2, an imaging system for imaging a patient is provided in embodiments of the present application. The imaging system includes: the X-ray detector comprises a bulb tube 21 and a flat panel detector 22, wherein the bulb tube 21 and the flat panel detector 22 are arranged oppositely, the bulb tube 21 emits X rays, the flat panel detector 22 detects the X rays to generate image data, and offset exists between an orthographic projection O of a focus of the bulb tube 21 on the flat panel detector 22 and a geometric center F of the flat panel detector 22.
The imaging system that this application embodiment provided, including the bulb of launching X ray and detect the flat panel detector that X ray generated image data, this application embodiment the geometric centre of flat panel detector for the focus of bulb is in orthographic projection on the flat panel detector has the offset to can avoid because of X ray is in orthographic projection on the flat panel detector with the geometric centre coincidence of flat panel detector, the partial edge image data quality that the flat panel detector that causes obtained according to image data is relatively poor. The imaging accuracy obtained according to the image data is better, and the image guiding effect in tumor treatment is improved.
In a specific implementation of the embodiment of the present application, the mounting position of the bulb 21 and/or the flat panel detector 22 or a moving device (not shown in the drawings) of the flat panel detector 22 causes an offset between an orthographic projection of the focal point of the bulb 21 on the flat panel detector 22 and a geometric center of the flat panel detector 22.
In the embodiment of the present application, an offset may exist between the orthographic projection of the focal point of the bulb 21 on the flat panel detector 22 and the geometric center of the flat panel detector 22 by the installation position of the bulb 21 and/or the flat panel detector 22, or an offset may exist between the orthographic projection of the focal point of the bulb 21 on the flat panel detector 22 and the geometric center of the flat panel detector 22 by a moving device (not shown in the figure) of the flat panel detector 22. The embodiment of the application can be applied to various imaging systems with a bulb and a flat panel detector, and the offset between the orthographic projection of the focus of the X-ray emitted by the bulb on the flat panel detector and the geometric center of the flat panel detector can be realized only by the installation position or the movement device of the flat panel detector 22.
In particular, the movement means may realize a translational movement or a rotational movement. Therefore, the embodiment of the application can be applied to an imaging system of translational motion of the flat panel detector and can also be applied to an imaging system of rotational motion of the flat panel detector.
In another specific implementation of the embodiment of the present application, the moving device sends an offset amount generated by the movement to an interface of a corresponding orthographic projection algorithm to generate corresponding image data.
Therefore, according to the embodiment of the application, different orthographic projection algorithms can be adopted according to different offsets generated by the movement of the movement device, so that more accurate image data can be obtained, and better image guidance can be realized.
In particular, the algorithm comprises a simulated orthographic projection algorithm or a reconstruction algorithm.
Therefore, different simulated orthographic projection algorithms or reconstruction algorithms are adopted in the embodiment of the application, more accurate image data is obtained, and better image guidance is achieved.
In a further specific implementation of the embodiment of the present application, referring to fig. 2, the geometric center of the flat panel detector is offset in the head-foot direction of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
The geometric center of the flat panel detector has an offset in the foot direction of the patient relative to the orthographic projection of the focal point of the bulb on the flat panel detector.
Specifically, the geometric center of the flat panel detector is deviated towards the foot direction of the patient by a first offset D1 relative to the orthographic projection of the focal point of the bulb on the flat panel detector.
By further example, the geometric center of the flat panel detector is offset in the left-right direction of the patient relative to the orthographic projection of the focal point of the bulb on the flat panel detector.
In yet another specific implementation of the embodiment of the present application, a geometric center of the flat panel detector is shifted away from the imaging region of interest with respect to a forward projection of the focal point of the bulb on the flat panel detector.
Illustratively, referring to FIG. 3, if the imaging region of interest is located on the patient's head A, the geometric center of the flat panel detector has a second offset D2 toward the patient's feet relative to the orthographic projection of the focal point of the bulb on the flat panel detector.
Therefore, the imaging region of interest, namely the blurring condition of the edge image data of the head of the patient, is reduced, the imaging region of interest is ensured to obtain more accurate edge image data, and the image guiding effect is improved.
For example, referring to fig. 4, if the imaging region of interest is located at a patient body part B, the geometric center of the flat panel detector has a third offset D3 toward a direction opposite to the patient body part with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
Therefore, the imaging region of interest, namely the blurring condition of the edge image data of the body of the patient, is reduced, the imaging region of interest is ensured to obtain more accurate edge image data, and the image guiding effect is improved.
The geometric centers of the interested imaging area and the flat panel detector are respectively positioned at different sides of the orthographic projection of the focus of the bulb tube on the flat panel detector.
In yet another specific implementation of the embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 3/4 of the length or the width of the flat panel detector.
According to the method and the device for detecting the image data, the first offset, the second offset or the third offset is set, so that the flat panel detector can obtain better image data.
In yet another specific implementation of the embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 1/2 of the length or the width of the flat panel detector.
According to the method and the device for detecting the image data, the first offset, the second offset or the third offset is set, so that the flat panel detector can obtain better image data.
In yet another specific implementation of the embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 200 mm.
According to the method and the device for detecting the image data, the first offset, the second offset or the third offset is set, so that the flat panel detector can obtain better image data.
In yet another specific implementation of the embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 100 mm.
According to the method and the device for detecting the image data, the first offset, the second offset or the third offset is set, so that the flat panel detector can obtain better image data.
Embodiments of the present application further provide a radiation therapy system, including a tumor therapy device and an imaging system as described in any of the above embodiments.
In a specific implementation of the embodiments of the present application, the imaging region of the imaging system at least partially coincides with the treatment region of the tumor treatment device.
The imaging system that this application embodiment provided, including the bulb of launching X ray and detect the flat panel detector that X ray generated image data, this application embodiment the geometric centre of flat panel detector for the focus of bulb is in orthographic projection on the flat panel detector has the offset to can avoid because of X ray is in orthographic projection on the flat panel detector with the geometric centre coincidence of flat panel detector, the partial edge image data quality that the flat panel detector that causes obtained according to image data is relatively poor. The imaging accuracy obtained according to the image data is better, and the image guiding effect in tumor treatment is improved.
The embodiment of the application also provides an imaging method which is applied to the bulb tube and the flat panel detector which are oppositely arranged. Referring to fig. 5, the method includes:
step 501, the bulb tube emits X-rays, and offset exists between the orthographic projection of the focus of the bulb tube on the flat panel detector and the geometric center of the flat panel detector.
Step 502, the flat panel detector detects the X-ray to generate image data.
In the imaging method provided by the embodiment of the application, the imaging method comprises a bulb for emitting X-rays and a flat panel detector for detecting the X-rays to generate image data, and the geometric center of the flat panel detector has an offset relative to the orthographic projection of the focus of the bulb on the flat panel detector, so that the situation that the partial edge image data quality obtained by the flat panel detector according to the image data is poor due to the fact that the orthographic projection of the X-rays on the flat panel detector is overlapped with the geometric center of the flat panel detector can be avoided. The imaging accuracy obtained according to the image data is better, and the image guiding effect in tumor treatment is improved.
In a specific implementation of the embodiment of the present application, referring to fig. 6, the step 502 includes:
step 5021, obtaining the offset.
Step 5022, generating corresponding image data according to the offset and the corresponding orthographic projection algorithm.
Therefore, according to the embodiment of the application, different orthographic projection algorithms can be adopted according to different offsets generated by the movement of the movement device, so that more accurate image data can be obtained, and better image guidance can be realized.
In particular, the algorithm comprises a simulated orthographic projection algorithm or a reconstruction algorithm.
Therefore, different simulated orthographic projection algorithms or reconstruction algorithms are adopted in the embodiment of the application, more accurate image data is obtained, and better image guidance is achieved.
In yet another specific implementation of the embodiment of the present application, referring to fig. 7, the step 5022 includes:
step 50221, generating a corresponding imaging mode according to the offset.
Step 50222, corresponding image data is generated according to the imaging mode and the algorithm corresponding to the imaging mode.
In a specific implementation of the embodiment of the present application, the geometric center of the flat panel detector has an offset in the head and foot direction of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific implementation of the embodiment of the present application, an orthographic projection of a geometric center of the flat panel detector on the flat panel detector with respect to a focal point of the bulb is biased toward a foot of a patient.
In a specific implementation of the embodiment of the present application, referring to fig. 2, the geometric center of the flat panel detector has a first offset D1 with respect to the orthographic projection of the focal point of the tube on the flat panel detector.
In a specific implementation of the embodiment of the present application, a geometric center of the flat panel detector is shifted away from the imaging region of interest with respect to a forward projection of the focal point of the bulb on the flat panel detector.
In a specific implementation of the embodiment of the present application, referring to fig. 3, if the imaging region of interest is located on the head of the patient, the geometric center of the flat panel detector has a second offset D2 toward the foot of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
Therefore, the imaging region of interest, namely the blurring condition of the edge image data of the head of the patient, is reduced, the imaging region of interest is ensured to obtain more accurate edge image data, and the image guiding effect is improved.
In a specific implementation of the embodiment of the present application, referring to fig. 4, if the imaging region of interest is located on the body part of the patient, the geometric center of the flat panel detector has a third offset D3 toward a direction opposite to the body part of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
Therefore, the imaging region of interest, namely the blurring condition of the edge image data of the body of the patient, is reduced, the imaging region of interest is ensured to obtain more accurate edge image data, and the image guiding effect is improved.
In a specific implementation of the embodiment of the present application, the geometric centers of the imaging region of interest and the flat panel detector are respectively located on different sides of an orthographic projection of the focal point of the bulb on the flat panel detector.
In a specific implementation of the embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 3/4 of the length or the width of the flat panel detector.
According to the method and the device for detecting the image data, the first offset, the second offset or the third offset is set, so that the flat panel detector can obtain better image data.
In a specific implementation of the embodiment of the present application, the first offset, the second offset, or the third offset is less than or equal to 1/2 of the length or the width of the flat panel detector.
According to the method and the device for detecting the image data, the first offset, the second offset or the third offset is set, so that the flat panel detector can obtain better image data.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (30)

1. An imaging system for imaging a patient, comprising: the X-ray detector comprises a bulb tube and a flat panel detector, wherein the bulb tube and the flat panel detector are arranged oppositely, the bulb tube emits X rays, the flat panel detector detects the X rays to generate image data, and the geometric center of the flat panel detector has offset relative to the orthographic projection of the focus of the bulb tube on the flat panel detector.
2. The imaging system according to claim 1, wherein the mounting position of the bulb and/or the flat panel detector or the movement device of the flat panel detector offsets the geometric center of the flat panel detector with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
3. The imaging system of claim 2, wherein the movement means may effect a translational movement or a rotational movement.
4. The imaging system of claim 3, wherein the motion device sends an offset resulting from the motion to an interface of a corresponding forward projection algorithm to generate corresponding image data.
5. The imaging system of claim 4, wherein the algorithm comprises a simulated orthographic projection algorithm or a reconstruction algorithm.
6. The imaging system of claim 1, wherein a geometric center of the flat panel detector is offset in a head-foot direction of the patient with respect to an orthographic projection of a focal point of the bulb on the flat panel detector.
7. The imaging system of claim 6, wherein a geometric center of the flat panel detector is offset in a direction of a foot of the patient with respect to an orthographic projection of a focal point of the bulb on the flat panel detector.
8. The imaging system of claim 7, wherein a geometric center of the flat panel detector is offset toward a foot of the patient by a first offset with respect to an orthographic projection of a focal point of the bulb on the flat panel detector.
9. The imaging system of claim 6, wherein a geometric center of the flat panel detector is offset away from the imaging region of interest relative to a forward projection of the focal point of the tube onto the flat panel detector.
10. The imaging system of claim 9, wherein if the imaging region of interest is located on the patient's head, the geometric center of the flat panel detector has a second offset toward the patient's foot with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
11. The imaging system of claim 9, wherein if the imaging region of interest is located on a patient body part, a geometric center of the flat panel detector has a third offset in a direction opposite the patient body part with respect to a forward projection of the focal point of the tube onto the flat panel detector.
12. The imaging system according to claim 10 or 11, wherein the geometric centers of the imaging region of interest and the flat panel detector are respectively located at different sides of an orthographic projection of the focal point of the bulb on the flat panel detector.
13. The imaging system of claim 8, 10 or 11, wherein the first offset, the second offset or the third offset is less than or equal to 3/4 of the flat panel detector length or width.
14. The imaging system of claim 10, wherein the first offset, the second offset, or the third offset is less than or equal to 1/2 of the flat panel detector length or width.
15. The imaging system of claim 8 or 9, wherein the first offset, the second offset, or the third offset is less than or equal to 200 mm.
16. The imaging system of claim 12, wherein the first offset, the second offset, or the third offset is less than or equal to 100 mm.
17. A radiation therapy system comprising a tumor therapy device and an imaging system according to any of claims 1-16.
18. The radiation therapy system of claim 17, wherein an imaging region of the imaging system at least partially coincides with a treatment region of the tumor treatment device.
19. An imaging method applied to a bulb and flat panel detector which are oppositely arranged, the method comprising the following steps:
the bulb tube emits X-rays, and the orthographic projection of the focus of the bulb tube on the flat panel detector has an offset with the geometric center of the flat panel detector;
the flat panel detector detects the X-ray generated image data.
20. The imaging method of claim 19, wherein the flat panel detector detecting the X-ray generated image data comprises:
acquiring the offset;
and generating corresponding image data according to the offset and a corresponding orthographic projection algorithm.
21. The imaging method of claim 20, wherein generating corresponding image data according to the offset and a corresponding forward projection algorithm comprises:
generating a corresponding imaging mode according to the offset;
and generating corresponding image data according to the imaging mode and an algorithm corresponding to the imaging mode.
22. The imaging method according to claim 19, wherein a geometric center of the flat panel detector is offset in a head-foot direction of the patient with respect to an orthographic projection of a focal point of the bulb on the flat panel detector.
23. The imaging method according to claim 22, wherein the geometric center of the flat panel detector is biased toward the foot of the patient with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
24. The imaging method according to claim 19, wherein a geometric center of the flat panel detector has a first offset with respect to an orthographic projection of a focal point of the tube on the flat panel detector.
25. The imaging method according to claim 19, wherein a geometric center of the flat panel detector is shifted away from the imaging region of interest with respect to a forward projection of a focal point of the bulb on the flat panel detector.
26. The imaging method according to claim 25, wherein if the imaging region of interest is located on the patient's head, the geometric center of the flat panel detector has a second offset toward the patient's foot with respect to the orthographic projection of the focal point of the bulb on the flat panel detector.
27. The imaging method according to claim 25, wherein if the imaging region of interest is located on a body part of the patient, a geometric center of the flat panel detector has a third offset toward a direction opposite to the body part of the patient with respect to a forward projection of the focal point of the bulb on the flat panel detector.
28. The imaging method according to claim 26 or 27, wherein the geometric centers of the imaging region of interest and the flat panel detector are respectively located at different sides of the orthographic projection of the focal point of the bulb on the flat panel detector.
29. A method of imaging as claimed in claim 24, 26 or 27 wherein the first, second or third offset is less than or equal to 3/4 of the flat panel detector length or width.
30. A method of imaging as claimed in claim 29, wherein the first offset, the second offset or the third offset is less than or equal to 1/2 of the flat panel detector length or width.
CN202011018090.9A 2020-09-24 2020-09-24 Imaging system, method and radiotherapy system Pending CN112221022A (en)

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CN102325499A (en) * 2009-01-21 2012-01-18 皇家飞利浦电子股份有限公司 Method and apparatus for large field of view imaging and detection and compensation of motion artifacts
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