CBCT (cone beam computed tomography) mechanism with adjustable imaging view

Abstract

The utility model relates to an imaging view adjustable CBCT mechanism, which comprises an X-ray emitter, a detector and a frame, the X-ray emitter is arranged on one side of the frame, and the detector is arranged on the other opposite side of the frame and can move left and right along the frame. Under the condition that SAD and SID are kept unchanged, different imaging view fields are obtained by adjusting the positions of the collimator and the detector, and the requirement that the head, the chest and the abdomen are scanned through the different imaging view fields is met.

Description

Technical Field

[0001] The utility model relates to the medical field, in particular to a CBCT mechanism with adjustable imaging field of view. Background Art

[0002] Gamma Knife is a combination of stereotactic technology and radiosurgery technology. It focuses the radiation source on the patient's lesions, so that the lesion tissue near the focus is irradiated with the maximum dose, and the normal tissue is irradiated with a transient low dose, thereby killing the lesions and protecting the normal tissue, achieving the purpose of radiotherapy. With the development of radiotherapy technology, people are increasingly pursuing precision radiotherapy, which can reduce damage and side effects to the patient's normal tissues. Using CBCT images to guide radiotherapy is an important means to ensure precision treatment. The CBCT image-guided system needs to use different imaging fields during the scanning process. For the head, a centered scan is used, and for larger parts such as the chest and abdomen, an offset scan is required to obtain a complete image.

[0003] Therefore, it is necessary to provide a new CBCT structure. Under the condition of ensuring that the SAD and SID remain unchanged, different imaging fields of view can be obtained by adjusting the positions of the collimator and the detector, so as to meet the needs of scanning the head, chest and abdomen with different imaging fields of view. Utility Model Content

[0004] In order to solve the above-mentioned technical problems existing in the background technology, the utility model provides a CBCT mechanism with adjustable imaging field of view. While ensuring that the SAD and SID remain unchanged, different imaging fields of view can be obtained by adjusting the positions of the collimator and the detector, thereby realizing the need to scan the head, chest and abdomen using different imaging fields of view.

[0005] The technical solution of the utility model is: the utility model is a CBCT mechanism with adjustable imaging field of view, which is special in that: the CBCT mechanism with adjustable imaging field of view includes an X-ray emitter, a detector and a frame, the X-ray emitter is arranged on one side of the frame, the detector is arranged on the other side opposite to the frame, and can move left and right along the frame.

[0006] Furthermore, a turntable and a gear driving mechanism for driving the turntable to rotate are arranged in the X-ray emitter, a rotating shaft is arranged at the center of the turntable, and a beam limiter is arranged on the turntable.

[0007] Furthermore, the beam limiter comprises an orthogonal beam limiter, a head beam limiter and a body beam limiter, and the head beam limiter, the body beam limiter and the orthogonal beam limiter are centrally symmetrically arranged on the turntable.

[0008] Furthermore, the head beam limiter is arranged directly above the center of the turntable, and the body beam limiter and the orthogonal beam limiter are symmetrically arranged on the left and right sides of the center of the turntable respectively.

[0009] Furthermore, the head beam limiter and the body beam limiter are arc-shaped structures, and the orthogonal beam limiter is a positive direction flat plate.

[0010] Furthermore, the imaging field of view adjustable CBCT mechanism also includes a driving mechanism capable of driving the detector to move, and the driving mechanism is arranged on the frame.

[0011] Furthermore, a guide rail is arranged on the side of the rack, and the detector is arranged on the guide rail and can move along the guide rail.

[0012] The utility model provides a CBCT mechanism with adjustable imaging field of view. Under the condition of ensuring that the SAD and SID remain unchanged, different imaging fields of view are obtained by switching the specifications of the beam limiter and adjusting the position of the detector, so as to meet the needs of scanning the head, chest and abdomen with different imaging fields of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the structure of the X-ray emitter of the utility model;

[0015] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0016] Figure 4 It is a schematic diagram of head scanning of the utility model;

[0017] Figure 5 It is a schematic diagram of body scanning of the utility model.

[0018] The following are the descriptions of the reference numerals:

[0019] 1. X-ray emitter; 2. Detector; 3. Frame; 4. Head beam limiter; 5. Body beam limiter; 6. Orthogonal beam limiter; 7. Turntable; 8. Gear drive mechanism; 9. Zero position. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] See also Figure 1 The structure of the specific embodiment of the utility model includes an X-ray emitter 1, a detector 2 and a rack 3. The X-ray emitter 1 is arranged on one side of the rack, and the detector 2 is arranged on the other side opposite to the rack 3. The X-ray emitter 1 can move left and right on the rack 3 through the guide rail and the driving mechanism. The movement direction is as follows: Figure 1 As indicated by the arrow.

[0022] See also Figure 2 , 3The X-ray emitter 1 of the present invention is internally provided with a turntable 7 and a gear driving mechanism 8 for driving the turntable 7 to rotate. A rotating shaft is provided at the center of the turntable 7, and a beam limiter is provided on the turntable 7.

[0023] The beam limiter part has three specifications of beam limiters, namely, orthogonal beam limiter 6, head beam limiter 4, and body beam limiter 5. The three specifications of beam limiters can be automatically switched. The orthogonal beam limiter 6, head beam limiter 4, and body beam limiter 5 are arranged on the turntable 7 in a central symmetric manner. Specifically, the head beam limiter 4 is arranged directly above the center of the turntable 7, and the body beam limiter 5 and the orthogonal beam limiter 6 are symmetrically arranged on the left and right sides of the center of the turntable 7. The beam limiter switching is achieved by controlling the rotation of the turntable 7 through the gear drive mechanism 8; the difference between the orthogonal beam limiter 6, head beam limiter 4, and body beam limiter 5 is the size of the parts and the thickness of the material, among which the head beam limiter 4 and the body beam limiter 5 are arc-shaped structures, and the body beam limiter 5 has a larger arc than the head beam limiter 4, mainly because the body requires a larger imaging field of view than the head, and the orthogonal beam limiter 6 is a positive direction flat plate; the zero position 9 is directly below the center of the turntable 7, that is, it will rotate to this position when not in use.

[0024] The utility model can complete three imaging modes, namely:

[0025] 1) In the CBCT orthogonal imaging mode, the line connecting the focus of the X-ray emitter and the center of the detector overlaps with the reference axis, and the beam limiter is switched to the orthogonal beam limiter. The position relationship is as follows: Figure 4 As shown, Figure 4 The head in the figure is a schematic diagram of a human head during head scanning.

[0026] 2) In CBCT head imaging mode, the line connecting the focus of the X-ray emitter and the center of the detector overlaps with the reference axis, and the beam limiter is switched to the head beam limiter. The position relationship is as follows: Figure 4 shown.

[0027] 3) In the CBCT body imaging mode, the detector moves a certain distance in the motion direction, and the beam limiter switches to the body beam limiter. The position relationship is as follows: Figure 5 As shown in the figure, the detector is offset downward by a certain distance relative to the head scan, and the beam limiter is also switched to the body beam limiter.

[0028] The content of the utility model and the technical content not specifically described in the above embodiments are the same as the prior art. The above are only specific implementation methods disclosed by the utility model, but the protection scope disclosed by the utility model is not limited thereto. The protection scope disclosed by the utility model shall be subject to the protection scope of the claims.

Claims

1. A CBCT mechanism with adjustable imaging field of view, characterized in that: The imaging field adjustable CBCT mechanism comprises an X-ray emitter, a detector and a frame, wherein the X-ray emitter is arranged on one side of the frame, and the detector is arranged on the other side opposite to the frame and can move left and right along the frame.

2. The imaging field adjustable CBCT mechanism according to claim 1, characterized in that: A turntable and a gear driving mechanism for driving the turntable to rotate are arranged in the X-ray emitter, a rotating shaft is arranged at the center of the turntable, and a beam limiter is arranged on the turntable.

3. The imaging field adjustable CBCT mechanism according to claim 2, characterized in that: The beam limiter comprises an orthogonal beam limiter, a head beam limiter and a body beam limiter, and the head beam limiter, the body beam limiter and the orthogonal beam limiter are centrally symmetrically arranged on the turntable.

4. The imaging field adjustable CBCT mechanism according to claim 3, characterized in that: The head beam limiter is arranged directly above the center of the turntable, and the body beam limiter and the orthogonal beam limiter are symmetrically arranged on the left and right sides of the center of the turntable respectively.

5. The imaging field adjustable CBCT mechanism according to claim 4, characterized in that: The head beam limiter and the body beam limiter are arc-shaped structures, and the orthogonal beam limiter is a positive direction flat plate.

6. The CBCT mechanism with adjustable imaging field of view according to any one of claims 1 to 5, characterized in that: The imaging field adjustable CBCT mechanism further comprises a driving mechanism capable of driving the detector to move, and the driving mechanism is arranged on the frame.

7. The imaging field adjustable CBCT mechanism according to claim 6, characterized in that: A guide rail is arranged on the side of the frame, and the detector is arranged on the guide rail and can move along the guide rail.

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