Imaging device and imaging method for mobile collimation scanning

Abstract

The invention discloses an imaging device and an imaging method for mobile collimation scanning, and relates to the technical field of image-guided radiotherapy, the imaging device comprises a mobile collimation mechanism which comprises a substrate and a blade movably arranged on the substrate, the blade is provided with a coverage area and a transmission area, and the substrate is provided with a first hollow area and a second hollow area which are communicated with each other; when the blade moves on the substrate, the covering area can cover the first hollow area, the transmission area and the second hollow area are communicated to form a plurality of continuous narrow strip areas for rays to pass through, and the plurality of continuous narrow strip areas are used for corresponding to a plurality of continuous detection positions of a treatment part; or, when the blade moves on the substrate, the covering area can be moved away from the covering of the first hollow area, so that the first hollow area and the second hollow area jointly form a wide strip area for the rays to pass through. According to the imaging device, the scattering condition can be reduced by capturing the rays passing through the plurality of continuous narrow strip areas, and the imaging quality of the image of the treatment part is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of image-guided radiotherapy, and more specifically, to a mobile collimation scanning imaging device. In addition, the present invention also relates to an imaging method of the mobile collimation scanning imaging device. Background Art

[0002] Image-guided radiotherapy based on cone-beam CT (Computed Tomography) is a representative technology for current precision radiotherapy. It uses three-dimensional imaging technology to verify the position of the tumor during treatment to improve treatment accuracy by targeting the location and shape changes of the tumor.

[0003] In related technologies, cone beam CT uses wide beam imaging. In this way, there are more scattered signals in the collected images, resulting in poor image quality. The acquired images cannot be directly used for radiation dose calculation and online adaptive radiotherapy, and cannot guarantee the accurate implementation of tumor radiotherapy.

[0004] In summary, how to improve the quality of cone beam CT imaging is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an imaging device for mobile collimation scanning, which can form a narrow strip area or a wide strip area by moving the blades and cooperating with the substrate to meet different needs, and reduce scattering by capturing the rays passing through multiple continuous narrow strip areas, thereby ensuring the imaging quality of the treatment site image. Another purpose of the present invention is to provide an imaging method for the above-mentioned imaging device for mobile collimation scanning.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An imaging device for mobile collimation scanning, comprising:

[0008] A mobile collimating mechanism comprises a substrate, a blade movably arranged on the substrate, the blade having a covering area and a transmission area, and the substrate is provided with a first hollow area and a second hollow area connected to each other;

[0009] When the blade moves on the substrate, the covering area can cover the first hollow area, and the transmission area is connected to the second hollow area to form a plurality of continuous narrow strip areas for rays to pass through, and the plurality of continuous narrow strip areas are used to correspond to a plurality of continuous detection positions of the treatment part;

[0010] Or, when the blade moves on the substrate, the covering area can be moved away from covering the first hollow area, so that the first hollow area and the second hollow area together form a wide strip area for the rays to pass through;

[0011] A ray mechanism for sending the rays to either the narrow strip area or the wide strip area and the treatment site;

[0012] An image receiving mechanism for capturing the rays and imaging, and the movable collimation mechanism is located between the ray mechanism and the image receiving mechanism.

[0013] Preferably, the blades include a first blade and a second blade. The area between the first blade and the second blade is the transmission area, and the corresponding areas on the surfaces of the first blade and the second blade are the covering areas. The first blade and the second blade can move in the same direction or in opposite directions along the substrate to correspondingly form the narrow strip area or the wide strip area.

[0014] Preferably, both edges of either the first blade or the second blade in a first direction extend beyond the first hollow area and the second hollow area, and at least one of the two edges is connected with a guiding mechanism for guiding the movement of the first blade and the second blade along the substrate;

[0015] Wherein, the first direction is perpendicular to the moving direction of the first blade and the second blade.

[0016] Preferably, at least one of the two edges is connected with a driving mechanism for driving the first blade and the second blade to move on the guiding mechanism.

[0017] Preferably, either the first blade or the second blade corresponds to at least one set of the driving mechanisms. The driving mechanism is connected to the edge through a belt, and the length direction of the belt is parallel to the guiding direction of the guiding mechanism.

[0018] Preferably, it further includes a treatment bed and a medical linear accelerator located at the top of the treatment bed. The ray mechanism and the image receiving mechanism are arranged on both sides of the medical linear accelerator, and the movable collimation mechanism is arranged between either the ray mechanism or the image receiving mechanism and the treatment bed.

[0019] Preferably, the ray mechanism, the medical linear accelerator, the image receiving mechanism, and the movable collimation mechanism can synchronously rotate circumferentially along the treatment bed, and one full circumferential rotation corresponds to capturing the rays passing through each narrow strip area or the rays passing through the wide strip area.

[0020] The present invention also provides an imaging method applied to the imaging device for movable collimation scanning described in any one of the above. The imaging method includes:

[0021] Obtain the treatment requirements of the treatment site, and determine a plurality of consecutive detection positions or one detection position;

[0022] Based on a plurality of consecutive detection positions or one detection position, respectively determine a plurality of the narrow strip areas or the wide strip areas;

[0023] Control the ray mechanism to emit the rays, and based on the determined plurality of narrow strip areas or wide strip areas, control the blades to move on the substrate;

[0024] Based on the image receiving mechanism capturing the rays passing through a plurality of the narrow strip areas and stitching them into an image or based on the image receiving mechanism capturing the rays passing through the wide strip area and acquiring an image.

[0025] Preferably, based on the determined plurality of narrow strip areas, controlling the blades to move on the substrate includes:

[0026] In the order of a plurality of consecutive detection positions, sequentially control the blades to move on the substrate. Each time the blades move on the substrate, it corresponds to the image receiving mechanism acquiring a narrow beam image.

[0027] Preferably, the blades include a first blade and a second blade, and the first blade and the second blade can move in the same direction or in opposite directions;

[0028] Based on the determined plurality of narrow strip areas, controlling the blades to move on the substrate further includes: based on the determined plurality of narrow strip areas, controlling the first blade and the second blade to move to change the size of the transmission area formed by the first blade and the second blade.

[0029] The imaging device for mobile collimation scanning provided by the present invention includes a mobile collimation mechanism, a ray mechanism, and an image receiving mechanism. The mobile collimation mechanism includes a substrate and blades. The substrate is provided with a first hollow area and a second hollow area that are connected. The blades are provided with a covering area and a transmission area. Specifically, the covering area can cover the first hollow area, and the transmission area can communicate with the second hollow area to form a narrow strip area. Specifically, when the blades move on the substrate, a plurality of consecutive narrow strip areas can be formed. By the image receiving mechanism capturing the rays passing through the plurality of narrow strip areas and the treatment site and stitching them into an image, the scattering situation can be reduced through the setting of the narrow strip areas, ensuring the imaging quality; and the movement of the blades on the substrate can also move the covering area away from covering the first hollow area, so that the first hollow area and the second hollow area jointly form a wide strip area. By the image receiving mechanism capturing the rays passing through the wide strip area and the treatment site and imaging, the conventional scanning requirements can be met.

[0030] The beneficial effects of the present invention are as follows: Narrow-beam imaging is achieved through the movement of the blades, effectively avoiding the influence of scattered signals on the image quality. After multiple narrow-beam imaging and the stitching, fusion, and reconstruction of the images, an image with a complete field of view is obtained to improve the density resolution of the scanned image, enabling it to be used for radiation dose calculation and online adaptive treatment, and ensuring the precise implementation of radiotherapy; Wide-beam imaging is achieved through the movement of the blades. When narrow-beam scanning is not used, the movement of the blades can be controlled to meet the requirements of conventional scanning imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0032] Figure 1 It is a schematic structural diagram of the imaging device for moving collimation scanning provided by the present invention;

[0033] Figure 2 It is a schematic structural diagram of the moving collimation mechanism provided by the present invention;

[0034] Figure 3 It is a half-sectional view of the moving collimation mechanism provided by the present invention;

[0035] Figure 4 It is a schematic diagram of the working relationship between the ray mechanism and the image receiving mechanism provided by the present invention.

[0036] Figures 1 - 4 Among them, the reference numerals include:

[0037] 1 - Ray mechanism; 2 - Moving collimation mechanism; 3 - Image receiving mechanism; 4 - Medical linear accelerator; 5 - Treatment couch; 21 - Blade; 201 - Substrate; 202 - Guiding mechanism; 203 - First blade; 204 - Driving mechanism; 205 - Transmission area; 206 - Belt; 207 - Second blade; 211 - Edge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0039] The core of the present invention is to provide an imaging device for mobile collimation scanning, which can form a narrow strip area or a wide strip area through the movement of the blades in cooperation with the substrate to meet different requirements. By capturing the rays passing through multiple consecutive narrow strip areas, the scattering situation is reduced, and the imaging quality of the image of the treatment site is ensured. Another core of the present invention is to provide an imaging method for the above-mentioned imaging device for mobile collimation scanning.

[0040] An imaging device for mobile collimation scanning provided by the present invention specifically includes a mobile collimation mechanism 2, a ray mechanism 1, and an image receiving mechanism 3. Please refer specifically to Figure 1 , Figure 4 . The imaging device specifically uses the ray mechanism 1 to perform multiple digital projections around the irradiated object (such as the treatment object), and then performs three-dimensional reconstruction of the collected projection data in a computer to finally obtain a three-dimensional image. It can also be said to be a technology that uses cone-beam projection for scanning imaging, that is, cone-beam CT.

[0041] Please continue to refer to Figure 2 , Figure 3 . The mobile collimation mechanism 2 includes a substrate 201 and blades 21 that are movably arranged on the substrate 201. Specifically, the movement of the blades 21 can change the beam size of the ray mechanism 1 to at least achieve the effect of suppressing scattering. Among them, the movement of the blades 21 can be specifically achieved through common power elements, such as motors, specifically stepper motors; such as cylinders and oil cylinders; or it can also be manually pushed.

[0042] When the movement of the blades 21 is manually realized, scales or marks corresponding to multiple moving positions can be set on the substrate 201 to facilitate precise movement; if it is realized through a power element, a start-stop program can be set to control the moving distance and start-stop of the blades 21, etc.

[0043] The blades 21 have a covering area and a transmission area 205, and the substrate 201 is provided with a first hollow area and a second hollow area that are connected. Among them, the transmission area 205 is the hollow area corresponding to the blade, and the covering area is the solid area corresponding to the blade 21.

[0044] The first hollow area and the second hollow area on the substrate 201 are actually the entire hollow area on the substrate 201. Specifically, when the blades 21 move, the areas of the substrate 201 corresponding to the transmission area 205 and the covering area divide the hollow area into the first hollow area and the second hollow area. Specifically, the area covered by the covering area is the first hollow area, and the area connected to the transmission area 205 is the second hollow area.

[0045] In a specific embodiment, when the blade 21 moves on the substrate 201, the covering area can cover the first hollow area, and the transmission area 205 and the second hollow area communicate to form a plurality of continuous narrow strip areas for the ray to pass through. The plurality of continuous narrow strip areas are used to correspond to a plurality of continuous detection positions of the treatment site. In this way, the narrow strip areas are used to reduce the beam of the ray mechanism 1 to reduce the scattering phenomenon, improve the density resolution of the image collected by the image receiving mechanism 3, improve the image quality, and are used for radiation dose calculation and online adaptive treatment, which can ensure the precise implementation of tumor radiotherapy. Specifically, the ray mechanism 1 emits rays to each narrow strip area and the treatment site respectively, and then the image receiving mechanism 3 can capture the rays and form narrow strip images corresponding to the plurality of detection positions respectively. By piecing together the plurality of narrow strip images, a relatively clear image of the entire field of view of the treatment site can be formed to meet the requirements of high-quality image acquisition.

[0046] It should be noted that the sizes of the plurality of narrow strip areas corresponding to the plurality of continuous detection positions can be the same or different, and can be set according to the actual image acquisition requirements.

[0047] In another specific embodiment, when the blade 21 moves on the substrate 201, the covering area can be moved away from covering the first hollow area, so that the first hollow area and the second hollow area jointly form a wide strip area for the ray to pass through. The width of the wide strip area is greater than the width of the narrow strip area. In this case, it corresponds to the image acquisition requirements that do not require narrow beam scanning, that is, the conventional scanning imaging requirements.

[0048] The ray mechanism 1 is used to send rays to either the narrow strip area or the wide strip area and the treatment site. The ray can first pass through the treatment site and then through the narrow strip area or the wide strip area; the ray can also first pass through the narrow strip area or the wide strip area and then through the treatment site. The moving collimation mechanism 2 is located between the ray mechanism 1 and the image receiving mechanism 3. In one case, the ray mechanism 1 sends rays to the narrow strip area and the corresponding detection position of the treatment site; in one case, the ray mechanism 1 sends rays to the wide strip area and the treatment site.

[0049] The image receiving mechanism 3 is used to capture rays and form images. Specifically, in the case of narrow beam scanning, the images formed by the rays corresponding to each narrow strip area captured are spliced, fused, and reconstructed in sequence to obtain an image of the entire field of view of the treatment site; in the case of wide beam scanning, the rays corresponding to the captured wide strip area are imaged to obtain an image of the entire field of view of the treatment site.

[0050] In this embodiment, it should be noted that except for the narrow strip area and the wide strip area, rays will not pass through other areas on the substrate 201 and other areas on the blade 21.

[0051] In one embodiment, the blade 21 may be an integral component with a hollow transmission area 205 formed therein. The transmission area 205 is preferably located at the middle position of the blade 21. Specifically, the portion of the blade 21 other than the transmission area 205 is the covering area. During the movement of the blade 21 during narrow-beam scanning, the covering area always covers the first hollow-out area. By changing the position of the transmission area 205 corresponding to the substrate 201, the position of the narrow strip area can be changed; during wide-beam scanning, the movement of the blade 21 means that the entire blade 21 moves away from the first hollow-out area and the second hollow-out area. In this way, the requirements of both narrow-beam scanning and wide-beam scanning can be satisfied simultaneously by the movement of a single blade 21, with a simple structure and good applicability.

[0052] In another embodiment, the blade 21 may also be composed of two separately movable components, with a gap formed between the two components, which is the transmission area 205; and the surfaces of both components are covering areas. Specifically, during narrow-beam scanning, the two components move in the same direction to change the position of the transmission area 205 relative to the substrate 201, thereby achieving the change of the position of the narrow strip area. During this process, both components cover the first hollow-out area; during wide-beam scanning, the two components move in opposite directions to avoid blocking the first hollow-out area, so that the first hollow-out area and the second hollow-out area can both pass through the rays. Of course, in this case, if the length of the substrate 201 is sufficient, the two components can also move in the same direction to avoid blocking the first hollow-out area.

[0053] In this embodiment, in order to ensure the comprehensiveness of the overall imaging during narrow-area scanning and avoid the lack of local positions of the detected part, a moving distance detection element may be provided to detect the moving distance of the blade 21. If the moving distance does not meet the set value, the operator needs to be informed in time for timely correction to ensure the comprehensive reliability of the imaging in the way of separately collecting images of multiple narrow strip areas.

[0054] In this embodiment, through narrow-beam imaging, the influence of scattered signals on the image quality is effectively avoided. Through the stitching, fusion, and reconstruction of the images after multiple narrow-beam imaging, a cone-beam CT image with a complete field of view is obtained, effectively solving the problems of low image density resolution in conventional wide-beam cone-beam CT scanning, which cannot be used for radiation dose calculation and online adaptive treatment, and ensuring the accurate implementation of radiotherapy. In addition, when narrow-beam scanning is not used, the movement of the blade 21 can be controlled to meet the imaging requirements of conventional cone-beam CT scanning.

[0055] Based on the above embodiments, please refer to Figure 2, the blade 21 includes a first blade 203 and a second blade 207. The area between the first blade 203 and the second blade 207 is the transmission area 205, and the corresponding areas on the surfaces of the first blade 203 and the second blade 207 are the covering areas. The first blade 203 and the second blade 207 can move in the same direction or in opposite directions along the substrate 201 to correspondingly form a narrow strip area or a wide strip area.

[0056] The sizes and shapes of the first blade 203 and the second blade 207 may or may not be the same, as long as they can cooperate with the substrate 201 to form a narrow strip area and a wide strip area, without any restrictions.

[0057] Among them, the area between the first blade 203 and the second blade 207, that is, the transmission area 205, is also the interval between the two. Specifically, the interval between the two refers to the distance between the two relatively close sides of the first blade 203 and the second blade 207. This distance can be set by itself according to different treatment parts or different treatment requirements, or can be preset as a fixed value.

[0058] Among them, the distance that can be set by itself is specifically achieved by controlling the movement of at least one of the first blade 203 and the second blade 207 to make the two approach or move away from each other, so as to change the size of the transmission area 205. For example, the size of the transmission area 205 can be input on the control panel according to different treatment parts or different treatment requirements, and based on this size, the movement of the first blade 203 and / or the second blade 207 can be controlled to automatically adjust the size of the transmission area 205.

[0059] In a specific embodiment, the first blade 203 and the second blade 207 move in the same direction along the substrate 201. On the premise that the transmission area 205 maintains a certain size, the first blade 203 and the second blade 207 move synchronously to change the position of the transmission area 205 on the substrate 201. When the position of the transmission area 205 changes, the hollow area on the substrate 201 connected to it is the second hollow area, and the remaining hollow areas are the first hollow areas. By horizontally moving the first blade 203 and the second blade 207, each movement corresponds to the formation of a narrow strip area, corresponding to a detection position of the treatment part. The distance of each movement is actually the size of the narrow strip area, ensuring that narrow strip areas corresponding to multiple consecutive detection positions are formed in sequence. The image receiving mechanism 3 captures multiple narrow strip areas passing through the ray in sequence and combines them in sequence to form an image acquisition of the entire field of view of the treatment part, corresponding to the usage requirements of narrow beam scanning imaging.

[0060] In a specific embodiment, the first blade 203 and the second blade 207 move in opposite directions along the substrate 201, gradually increasing the transmission area 205 until both the first hollow area and the second hollow area of the substrate 201 are exposed for the ray to pass through, corresponding to the usage requirement of wide-beam scanning imaging. In this way of moving in opposite directions, the overall size requirement for the substrate 201 is relatively small, and the volume and weight of the entire moving collimation mechanism 2 can be saved.

[0061] In this embodiment, the first blade 203 and the second blade 207 can be driven by the same driving component or by two driving components respectively, without limitation.

[0062] By setting the blades as the first blade 203 and the second blade 207, the usage requirement of adjusting the size of the transmission area 205 can be met, and the applicability is stronger.

[0063] The movement of both the first blade 203 and the second blade 207 can be bidirectional, specifically realized by the forward and reverse rotation of the driving component.

[0064] Based on any of the above embodiments, please refer to Figure 2 , for either the first blade 203 or the second blade 207, both edges 211 along the first direction extend beyond the first hollow area and the second hollow area of the substrate 201, and at least one of the two edges 211 is connected with a guiding mechanism 202, and the guiding mechanism 202 is used for guiding the movement of the first blade 203 and the second blade 207 along the substrate 201; wherein, the first direction is perpendicular to the moving direction of the first blade 203 and the second blade 207. Specifically, the moving direction of the first blade 203 and the second blade 207 is as shown by the arrow in Figure 2 .

[0065] Among them, the guiding mechanism 202 needs to be arranged to avoid the first hollow area and the second hollow area of the substrate 201, so as to avoid affecting the movement of the transmission area 205 relative to the substrate 201 and avoid affecting the penetration of the ray.

[0066] Among them, at least one of the two edges 211 is connected with the guiding mechanism 202. Specifically, guiding mechanisms 202 can be arranged on both edges 211, or guiding mechanisms 202 can be arranged on any one of the edges 211. In addition, the guiding mechanism 202 is specifically connected to one edge 211 or both edges 211 corresponding to the first blade 203 and the second blade 207 respectively, and setting a group can meet the guiding requirements of the two blades.

[0067] Specifically, the guiding mechanism 202 can provide guiding for the movement of the first blade 203 and the second blade 207 in forms such as a sliding groove and a slider, two sliding grooves, a pulley and a sliding groove, etc., which will not be specifically described.

[0068] Such as Figure 2As shown, two edges 211 of the first blade 203 and the second blade 207 correspond to two sets of guiding mechanisms 202 to ensure the reliability of guiding, ensure the accuracy of the moving routes of the first blade 203 and the second blade 207, ensure that when applied to narrow-beam scanning imaging, the size of each narrow strip area remains the same, and ensure the imaging quality.

[0069] Among them, the guiding mechanism 202 is detachably connected to the substrate 201. Of course, the connections between the first blade 203 and the second blade 207 and the guiding mechanism 202 are also detachably connected.

[0070] In this embodiment, limits can be synchronously set on the guiding mechanism 202 to prevent the first blade 203 and the second blade 207 from moving beyond the limit on the substrate 201, which may cause component damage. The specific limit can be achieved by setting proximity sensors and related alarm components, or by setting limit blocks to block the movement, without specific limitations.

[0071] Based on any of the above embodiments, please refer to Figure 2 , at least one of the two edges 211 is connected with a driving mechanism 204, and the driving mechanism 204 is used to drive the first blade 203 and the second blade 207 to move on the guiding mechanism 202.

[0072] Among them, the driving mechanism 204 specifically drives the movement of the first blade 203 and the second blade 207 through transmission components. Transmission components such as gear-rack mechanisms, conveyor belts, etc. can convert the driving force of the driving mechanism 204 into the translational force of the blade movement.

[0073] In a specific embodiment, at least one of the first blade 203 and the second blade 207 has an edge 211 connected to the driving mechanism 204. The first blade 203 and the second blade 207 are connected, and by driving the edge 211 through the driving mechanism 204, the synchronous and co-directional movement of the first blade 203 and the second blade 207 can be driven; in a specific embodiment, one edge 211 of the first blade 203 is connected to one driving mechanism 204, and one edge 211 of the second blade 207 is connected to one driving mechanism 204. Of course, the two edges 211 of the first edge 211 of the first blade 203 and one edge 211 of the second blade 207 can be relatively arranged or located on the same side.

[0074] The movement of the first blade 203 and the second blade 207 is realized through the driving mechanism 204. The start and stop of the driving mechanism 204 can be controlled through a pre-set driving program to meet the different requirements of wide-beam scanning and narrow-beam scanning.

[0075] Based on any of the above embodiments, please refer to Figure 2, either the first blade 203 or the second blade 207 corresponds to at least one set of driving mechanisms 204. The driving mechanisms 204 are connected to the edge 211 through a belt 206, and the length direction of the belt 206 is parallel to the guiding direction of the guiding mechanism 202.

[0076] For example, if the first blade 203 corresponds to one set of driving mechanisms 204 and the second blade 207 corresponds to one set of driving mechanisms 204, as Figure 2 shown, for the balance and reliability of the entire moving collimation structure, the two sets of driving mechanisms 204 are arranged on two relatively arranged edges 211. When the position of the transmission area 205 needs to be adjusted, by controlling the synchronous operation of the two sets of driving mechanisms 204, the synchronous movement of the first blade 203 and the second blade 207 can be ensured. In this case, in order to detect the synchronous movement of the first blade 203 and the second blade 207, a distance detection element can be set, such as a distance sensor, an infrared detection element, etc. The moving distances of the first blade 203 and the second blade 207 are determined through the distance detection element. If the moving distances of the two are inconsistent, they are not synchronized and correction needs to be carried out in time to avoid the situation of missing images collected.

[0077] If the first blade 203 corresponds to two sets of driving mechanisms 204 and the second blade 207 corresponds to two sets of driving mechanisms 204, the two sets of driving mechanisms 204 respectively correspond to two relatively arranged edges 211 of the blade, and the specific implementation manner will not be elaborated here.

[0078] The driving mechanism 204 is connected to the edge 211 through a belt 206, and the length direction of the belt 206 is parallel to the guiding direction of the guiding mechanism 202. As Figure 2 shown, the belt 206 rotates to drive the movement of the first blade 203 and the second blade 207. Using the belt 206 as a transmission component, the structure is simple and effective, and can have good smoothness and reliability, ensuring the reliable and convenient adjustment of the position of the transmission area 205.

[0079] On the basis of any of the above embodiments, please refer to Figure 1 , and it further includes a treatment table 5 and a medical linear accelerator 4 located on the top of the treatment table 5. The ray mechanism 1 and the image receiving mechanism 3 are arranged on both sides of the medical linear accelerator 4, and the moving collimation mechanism 2 is arranged between any one of the ray mechanism 1, the image receiving mechanism 3 and the treatment table 5.

[0080] Among them, the treatment table 5 is a component for patient treatment, and the treatment site is the site where the patient needs treatment.

[0081] The moving collimation mechanism 2 can be arranged between the ray mechanism 1 and the treatment table 5, or the moving collimation mechanism 2 can also be arranged between the treatment table 5 and the image receiving mechanism 3, as long as the effect of adjusting the size of the ray beam can be achieved before imaging.

[0082] In any case, it should be noted that the mobile collimation mechanism 2, the ray mechanism 1, and the image receiving mechanism 3 are preferably coaxially arranged.

[0083] The medical linear accelerator 4, the ray mechanism 1, the image receiving mechanism 3, and the mobile collimation mechanism 2 can all rotate circumferentially around the treatment couch 5 to complete image acquisition and treatment operations. Among them, image acquisition is mainly used for position correction of image-guided radiotherapy.

[0084] Based on any of the above embodiments, please refer to Figure 1 , the ray mechanism 1, the medical linear accelerator 4, the image receiving mechanism 3, and the mobile collimation mechanism 2 can rotate synchronously along the circumferential direction of the treatment couch 5, and one full circle of circumferential rotation corresponds to capturing the ray passing through each narrow strip area or the ray passing through the wide strip area.

[0085] The way that the ray mechanism 1, the medical linear accelerator 4, the image receiving mechanism 3, and the mobile collimation mechanism 2 move synchronously can set the four of them on the same turntable, or connect the four of them into one body to ensure the accuracy and effectiveness of synchronization.

[0086] For wide beam scanning, when the ray mechanism 1, the medical linear accelerator 4, the image receiving mechanism 3, and the mobile collimation mechanism 2 rotate synchronously for one full circle, the image receiving mechanism 3 can capture the ray passing through the wide strip area to form an overall image of the treatment site.

[0087] For narrow beam scanning, when the ray mechanism 1, the medical linear accelerator 4, the image receiving mechanism 3, and the mobile collimation mechanism 2 rotate synchronously for one full circle, it corresponds to capturing the ray passing through a narrow strip area. By rotating multiple circles, the ray passing through multiple narrow strip areas can be captured, and then the image of the entire treatment site can be obtained by piecing together the images.

[0088] In addition to the above imaging device for mobile collimation scanning, the present invention also provides an imaging method including the imaging method disclosed in the above embodiments, and this imaging method is applied to the imaging device corresponding to any of the above embodiments.

[0089] The imaging method specifically includes: obtaining the treatment requirements of the treatment site, determining multiple consecutive detection positions or one detection position. Here, the multiple detection positions or one detection position specifically correspond to narrow beam scanning and wide beam scanning. The multiple detection positions are multiple consecutive positions of the treatment site, and the single detection position is the overall position of the treatment site; based on the multiple consecutive detection positions or one detection position, respectively determine multiple narrow strip areas or wide strip areas. Specifically, based on the multiple detection positions, respectively determine multiple narrow strip areas, and determine the number, size, order, etc. of the narrow strip areas; specifically, determine the size of the wide strip area based on one detection position.

[0090] Control the ray mechanism 1 to emit rays, and based on the determined multiple narrow strip areas or wide strip areas, control the movement of the blades 21 on the substrate 201 to perform narrow beam scanning or wide beam scanning.

[0091] Based on the image receiving mechanism 3 capturing the rays passing through multiple narrow strip areas and piecing them together to form an image to meet the requirements of narrow beam scanning; or based on the image receiving mechanism 3 capturing the rays passing through the wide strip areas and collecting them to form an image to meet the requirements of wide beam scanning.

[0092] On the basis of the above embodiments, controlling the movement of the blades 21 on the substrate 201 based on the determined multiple narrow strip areas includes: sequentially controlling the movement of the blades 21 on the substrate 201 in the order of multiple consecutive detection positions. Each time the blades 21 move on the substrate 201, it corresponds to the image receiving mechanism 3 collecting a narrow beam image.

[0093] The order of the multiple consecutive detection positions here can be clockwise or counterclockwise, or can be forward translation or reverse translation.

[0094] Specifically controlling the movement of the blades on the substrate 201 is to be based on the order of multiple consecutive detection positions to ensure that the narrow strip areas are continuous, which is convenient for later processing of the rays to piece together an image and ensure the quality and efficiency of imaging.

[0095] On the basis of the above embodiments, the blade 21 includes a first blade 203 and a second blade 207, and the first blade 203 and the second blade 207 can move in the same direction or in opposite directions.

[0096] Based on the determined multiple narrow strip areas, controlling the movement of the blades 21 on the substrate 201 further includes: based on the determined multiple narrow strip areas, controlling the movement of the first blade 203 and the second blade 207 to change the size of the transmission area 205 formed by the first blade 203 and the second blade 207. Specifically, based on the treatment requirements or actual clinical conditions, it is necessary to adjust the size of the transmission area 205 to adjust the size of the ray beam, that is, to adjust the density resolution of the image. Such adjustment is specifically carried out before imaging, and it is only necessary to move either the first blade 203 or the second blade 207 to be applicable to more treatment scenarios and improve the applicability.

[0097] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts between the embodiments, reference can be made to each other.

[0098] The above has introduced in detail an imaging device and an imaging method for mobile collimation scanning. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A mobile collimation scanning imaging device, characterized in that: include: A movable collimation mechanism (2) comprises a substrate (201), a blade (21) movably arranged on the substrate (201), the blade (21) having a covering area and a transmission area (205), and the substrate (201) being provided with a first hollow area and a second hollow area which are connected; When the blade (21) moves on the substrate (201), the covering area can cover the first hollow area, and the transmission area (205) is connected to the second hollow area to form a plurality of continuous narrow strip areas for rays to pass through, and the plurality of continuous narrow strip areas are used to correspond to a plurality of continuous detection positions of the treatment site; Alternatively, when the blade (21) moves on the substrate (201), the covering area can be moved away from covering the first hollow area, so that the first hollow area and the second hollow area together form a wide strip area for the rays to pass through; A radiation mechanism (1) for transmitting the radiation to any one of the narrow strip area and the wide strip area, and the treatment site; The image receiving mechanism (3) is used to capture the ray and form an image, and the mobile collimation mechanism (2) is located between the ray mechanism (1) and the image receiving mechanism (3).

2. The imaging device of mobile collimation scanning according to claim 1, characterized in that: The blade (21) comprises a first blade (203) and a second blade (207); the area between the first blade (203) and the second blade (207) is the transmission area (205); the corresponding area on the surface of the first blade (203) and the second blade (207) is the covering area; the first blade (203) and the second blade (207) can move in the same direction or in opposite directions along the substrate (201) to form the narrow strip area or the wide strip area accordingly.

3. The imaging device of mobile collimation scanning according to claim 2, characterized in that: Both edges (211) of the first blade (203) and the second blade (207) along the first direction are arranged beyond the first hollow area and the second hollow area, and at least one of the two edges (211) is connected to a guide mechanism (202), the guide mechanism (202) being used for guiding the first blade (203) and the second blade (207) to move along the substrate (201); The first direction is perpendicular to the direction in which the first blade (203) and the second blade (207) move.

4. The imaging device of mobile collimation scanning according to claim 3, characterized in that: At least one of the two edges (211) is connected to a driving mechanism (204), and the driving mechanism (204) is used to drive the first blade (203) and the second blade (207) to move on the guide mechanism (202).

5. The imaging device of mobile collimation scanning according to claim 4, characterized in that: Each of the first blade (203) and the second blade (207) corresponds to at least one set of the driving mechanisms (204); the driving mechanisms (204) are connected to the edge (211) via a belt (206); and the length direction of the belt (206) is parallel to the guide direction of the guide mechanism (202).

6. The imaging device for mobile collimation scanning according to any one of claims 1 to 5, characterized in that: The invention also comprises a treatment bed (5) and a medical linear accelerator (4) located on top of the treatment bed (5); the radiation mechanism (1) and the image receiving mechanism (3) are arranged on both sides of the medical linear accelerator (4); and the mobile collimation mechanism (2) is arranged between any one of the radiation mechanism (1), the image receiving mechanism (3) and the treatment bed (5).

7. The imaging device of mobile collimation scanning according to claim 6, characterized in that: The ray mechanism (1), the medical linear accelerator (4), the image receiving mechanism (3), and the mobile collimation mechanism (2) can be synchronously rotated along the circumference of the treatment bed (5), and one circumferential rotation corresponds to capturing each ray passing through the narrow strip area or each ray passing through the wide strip area.

8. An imaging method, characterized in that: The imaging device for mobile collimation scanning according to any one of claims 1 to 7, wherein the imaging method comprises: Obtaining the treatment requirement of the treatment part, and determining a plurality of continuous detection positions or one detection position; Based on a plurality of continuous detection positions or one detection position, respectively determine a plurality of narrow strip areas or a plurality of wide strip areas; Controlling the ray mechanism (1) to send the ray, and based on the determined plurality of narrow strip areas or wide strip areas, controlling the blade (21) to move on the substrate (201); Based on the image receiving mechanism (3), the rays passing through the plurality of narrow strips are captured and assembled into an image, or based on the image receiving mechanism (3), the rays passing through the wide strip are captured and an image is collected.

9. The imaging method according to claim 8, characterized in that: Based on the determined plurality of narrow strips, controlling the blade (21) to move on the substrate (201) comprises: The blade (21) is controlled to move on the substrate (201) in sequence according to the sequence of the plurality of continuous detection positions, and each movement of the blade (21) on the substrate (201) corresponds to the image receiving mechanism (3) collecting a narrow beam image.

10. The imaging method according to claim 9, characterized in that: The blade (21) comprises a first blade (203) and a second blade (207), and the first blade (203) and the second blade (207) can move in the same direction or in opposite directions; Based on the determined multiple narrow strip areas, controlling the blade (21) to move on the substrate (201) also includes: based on the determined multiple narrow strip areas, controlling the first blade (203) and the second blade (207) to move, so as to change the size of the transmission area (205) formed by the first blade (203) and the second blade (207).

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