CN114288568A - Isocenter correction method and system for radiotherapy equipment and storage medium - Google Patents
Isocenter correction method and system for radiotherapy equipment and storage medium Download PDFInfo
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Abstract
The application discloses an isocenter correction method and system of radiotherapy equipment and a storage medium, and belongs to the technical field of medical instruments. The method comprises the following steps: acquiring at least one image group shot by an imaging part of radiotherapy equipment; determining deviation between two blocking bodies in the image group in the corresponding coordinate axis direction based on the corresponding relation between the at least one image group and at least one coordinate axis direction; and correcting the isocenter of the radiotherapy equipment on the basis of the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction. The isocenter of the radiotherapy equipment is not required to be corrected in a mode of manually analyzing films, and the correction efficiency of the isocenter of the radiotherapy equipment is effectively improved.
Description
Technical Field
The present application relates to the field of medical apparatus and instruments, and in particular, to an isocenter calibration method and system for radiotherapy equipment, and a storage medium.
Background
Radiotherapy is an important means for treating cancer, and radiotherapy equipment (radiotherapy equipment for short) is a key medical equipment for carrying out radiotherapy.
Radiotherapy apparatus may generally comprise: a rotating frame and a treatment head positioned on the rotating frame. Generally, after the treatment head of the radiotherapy device is assembled or the treatment head in the radiotherapy device is repaired, the isocenter of the radiotherapy device needs to be corrected, so that the offset between the corrected isocenter and the treatment isocenter (i.e., the focal point of the ray bundle emitted by the treatment head) is smaller than a preset value. Otherwise, the ray bundle emitted from the treatment head may not irradiate the target area of the patient, resulting in that the radiotherapy equipment cannot accurately treat the target area of the patient.
In the related art, when the isocenter of the radiotherapy device needs to be corrected, the radiation beam of the treatment head needs to be irradiated on the film to form a focal spot on the film, wherein the center of the focal spot is the treatment isocenter. And the offset between the center of the focal spot and a preset point (the preset point is the isocenter of the radiotherapy equipment) needs to be manually analyzed, and then the isocenter of the radiotherapy equipment can be corrected through the offset. However, the verification of isocenters of radiotherapy equipment by film is currently inefficient.
Disclosure of Invention
The embodiment of the application provides an isocenter correction method and system of radiotherapy equipment and a storage medium. The problem that the efficiency of verifying the isocenter of radiotherapy equipment through films in the prior art is low can be solved, and the technical scheme is as follows:
in one aspect, an isocenter correction method of a radiotherapy apparatus is provided, the method including:
acquiring at least one image group shot by an imaging part of radiotherapy equipment, wherein each image group comprises two images shot when the imaging part is positioned at two opposite positions, and the two images are images containing the same barrier;
determining deviation between two blocking bodies in the image group in the corresponding coordinate axis direction based on the corresponding relation between the at least one image group and at least one coordinate axis direction;
and correcting the isocenter of the radiotherapy equipment on the basis of the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction.
Optionally, the correcting the isocenter of the radiotherapy apparatus based on the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction includes:
determining the offset of the isocenter of the radiotherapy equipment in the corresponding coordinate axis direction based on the deviation between two blocking bodies in the image group in the corresponding coordinate axis direction;
correcting the isocenter based on the offset amount.
Optionally, determining, based on a deviation between two blocking bodies in the image group in a corresponding coordinate axis direction, an offset of an isocenter of the radiotherapy apparatus in the corresponding coordinate axis direction, includes:
determining the offset of the isocenter in the corresponding coordinate axis direction by adopting an offset calculation formula based on the deviation between two blocking bodies in the image group in the corresponding coordinate axis direction;
wherein, the offset calculation formula is as follows:
wherein d is the deviation between two barriers in the image group in the corresponding coordinate axis direction; d is the offset of the isocenter in the corresponding coordinate axis direction; s1 is the distance between the source of radiation in the imaging portion and the isocenter; s2 is the distance from the ray source in the imaging part to the detector after passing through the isocenter.
Optionally, correcting the isocenter based on the offset includes:
correcting the isocenter by adopting a correction formula based on the offset;
wherein the correction formula is:
O1＝O2-D；
wherein, O1The coordinate values of the isocenter after correction in the corresponding coordinate axis direction are obtained; o is2And the coordinate values of the isocenter in the corresponding coordinate axis direction before correction are obtained.
Optionally, determining a deviation between two blocking bodies in the image group in a corresponding coordinate axis direction based on a correspondence between the at least one image group and at least one coordinate axis direction, includes:
determining coordinate values of the central point of each barrier in the image group in the corresponding coordinate axis direction based on the corresponding relation between the at least one image group and at least one coordinate axis direction;
and determining the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction based on the coordinate values of the central point of each blocking body in the image group in the corresponding coordinate axis direction.
Optionally, the number of the at least one image group is two, and the two image groups respectively correspond to an X-axis direction and a Z-axis direction in a coordinate system of the radiotherapy apparatus;
wherein two images in the image group corresponding to the Z-axis direction are images captured by the imaging part in the X-axis direction; two images in the image group corresponding to the X-axis direction are images captured by the imaging unit in the Z-axis direction.
In another aspect, there is provided an isocenter correction system of a radiotherapy apparatus, the system comprising: radiotherapy apparatus, a barrier and a treatment apparatus, wherein,
the radiotherapy apparatus comprises: an imaging section for photographing the blocking body;
the blocking body is detachably arranged at the isocenter of the radiotherapy equipment, and the center of the blocking body is superposed with the isocenter of the radiotherapy equipment;
the processing device is connected with the imaging part and is used for executing the isocenter correction method of the radiotherapy device.
Optionally, the imaging part includes: the radiation source and the detector are oppositely arranged.
Optionally, the system further includes: the detection die body, the stopper install detect the central point of die body department, the stopper pass through the detection die body demountable installation in radiotherapy equipment's isocenter department.
In yet another aspect, there is provided a computer readable storage medium having stored therein at least one instruction, which is loaded and executed by a processor to implement the isocenter correction method of a radiotherapy apparatus as described in any of the above.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the imaging part is used for acquiring at least one image group containing the same blocking body, and the deviation of the two blocking bodies in each image group in the corresponding coordinate axis direction is analyzed, so that the isocenter of the radiotherapy equipment can be corrected. The isocenter of the radiotherapy equipment is not required to be corrected in a mode of manually analyzing films, and the correction efficiency of the isocenter of the radiotherapy equipment is effectively improved. And, at the in-process of rectifying the isocenter to radiotherapy equipment, only need radiotherapy equipment's formation of image portion to carry out work, need not radiotherapy equipment's treatment head work, and the radiation that treatment head produced at the during operation is far greater than the radiation that formation of image portion produced at the during operation, consequently, the isocenter of radiotherapy equipment that this application provided carries out the calibration in-process, can also effectual reduction radiant mass.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an isocenter correction system of a radiotherapy apparatus according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a detection phantom according to an embodiment of the present disclosure;
fig. 3 is an isocenter calibration method of a radiotherapy apparatus according to an embodiment of the present application;
fig. 4 is an isocenter correction method of another radiotherapy apparatus provided in an embodiment of the present application;
FIG. 5 is a schematic diagram of an imaging part acquiring an image group corresponding to a Z-axis direction according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of an imaging part acquiring an image group corresponding to an X-axis direction according to an embodiment of the present application;
FIG. 7 is a schematic diagram of an image group corresponding to a Z-axis direction according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of another image set corresponding to the Z-axis direction according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of an image group corresponding to an X-axis direction according to an embodiment of the present disclosure;
FIG. 10 is a schematic diagram of another image set corresponding to the X-axis direction according to the embodiment of the present application;
fig. 11 is a schematic diagram of an image group corresponding to the Z-axis direction when the isocenter of the radiotherapy apparatus is shifted downward in the Z-axis direction according to the embodiment of the present application;
fig. 12 is a graph showing a relationship between a deviation amount and an offset amount in the Z axis according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an isocenter calibration system of a radiotherapy apparatus according to an embodiment of the present disclosure. The isocenter verification system 100 of the radiotherapy apparatus may include: a radiotherapy device 101, a barrier 102 and a treatment device 103.
The radiotherapy device 101 may comprise: an image forming section 1012. It should be noted that the radiotherapy apparatus 101 may further include: rotating the frame 1013 and the treatment head 1011. The treatment head 1011 and the imaging part 1012 are both required to be mounted on a mounting surface of the rotating frame 1013, and the rotating frame 1013 can drive the treatment head 1011 and the imaging part 1012 to rotate at the same time. Alternatively, the imaging section 1012 may include: a source 1012a and a detector 1012b are oppositely disposed. The radiation emitting direction of the radiation source 1012a may be perpendicular to the radiation emitting direction of the treatment head 1011.
The block 102 is removably mounted at the isocenter of the radiotherapy device 101, and the center of the block 102 may coincide with the isocenter of the radiotherapy device 101. Illustratively, the barrier 102 may be a metal ball. For example, the metal ball may be a tungsten ball.
The processing device 103 may be connected with the imaging part 1012 in the radiotherapy device 101. The processing device 103 is capable of controlling the imaging part 1012 in the radiotherapy device 101 to image the barrier 102 located at the isocenter of the radiotherapy device 101. And after the imaging part 1012 images the barrier 102, the imaging part 1012 may transmit the acquired image of the barrier 102 to the processing device 103.
In the process of imaging the barrier 102 by the imaging unit 1012, the radiation source 1012a in the imaging unit 1012 can emit a radiation beam toward the barrier 102, and the detector 1012b in the imaging unit 1012 can capture projection data generated after transmitting the barrier 102, and generate a two-dimensional image (also referred to as an image) corresponding to the barrier 102 based on the projection data.
As an example, the ray source 1012a in the imaging portion 1012 may be a generally spherical tube, which is capable of emitting X-rays, which are in KV level, and which may be cone beam rays. The detector 1012b in the imaging portion 1012 may be a flat panel detector in general.
Optionally, the isocenter verification system 100 of the radiotherapy apparatus may further include: a phantom 104 is detected. Wherein, the blocking body 103 may be installed at a central position of the detection mold body 104. The blocking body 103 can be detachably mounted at the isocenter of the radiotherapy equipment through a detection die body 104.
For example, please refer to fig. 2, fig. 2 is a schematic structural diagram of a detection motif according to an embodiment of the present application. The detection phantom 104 may be square in shape, and the detection phantom 104 has an inner cavity in the center for receiving the stopper 102.
In the embodiment of the present application, the radiotherapy apparatus 101 may further include: a treatment couch 1014. The detection phantom 104 may be mounted on a treatment couch 1014. When the isocenter of the radiotherapy device 101 needs to be corrected, the radiotherapy device 101 can control the treatment couch 1014 to move a designated distance, so that the center of the blocking body in the detection mold 104 on the treatment couch 1014 coincides with the isocenter of the radiotherapy device.
It should be noted that the radiotherapy apparatus 101 has a three-dimensional coordinate system, and the three-dimensional coordinate system may be an IEC coordinate system. Wherein, the Z-axis direction in the three-dimensional coordinate system of the radiotherapy equipment 101 is the height direction of the radiotherapy equipment 101; the Y-axis direction of the radiotherapy apparatus 101 is the direction of the axis of the rotating frame 1013, that is, the radiotherapy apparatus 101 can rotate around the Y-axis; the X-axis direction of the radiotherapy apparatus 101 is perpendicular to the Z-axis direction and perpendicular to the Y-axis direction.
Referring to fig. 3, fig. 3 is a diagram illustrating an isocenter calibration method of a radiotherapy apparatus according to an embodiment of the present disclosure. The isocenter correction method of a radiotherapy apparatus is applied to the processing apparatus 103 in the isocenter correction system of the radiotherapy apparatus shown in fig. 1. The isocenter correction method of the treatment apparatus may include:
And 202, determining deviation between two blocking bodies in the image group in the corresponding coordinate axis direction based on the corresponding relation between the at least one image group and the at least one coordinate axis direction.
And step 203, correcting the isocenter of the radiotherapy equipment based on the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction.
In summary, according to the isocenter correction method for radiotherapy equipment provided in the embodiment of the present application, at least one image group including the same blocking body is obtained by the imaging unit, and then the isocenter of the radiotherapy equipment can be corrected by analyzing the deviation of the two blocking bodies in each image group in the corresponding coordinate axis direction. The isocenter of the radiotherapy equipment is not required to be corrected in a mode of manually analyzing films, and the correction efficiency of the isocenter of the radiotherapy equipment is effectively improved. And, at the in-process of rectifying the isocenter to radiotherapy equipment, only need radiotherapy equipment's formation of image portion to carry out work, need not radiotherapy equipment's treatment head work, and the radiation that treatment head produced at the during operation is far greater than the radiation that formation of image portion produced at the during operation, consequently, the isocenter of radiotherapy equipment that this application provided carries out the calibration in-process, can also effectual reduction radiant mass.
Referring to fig. 4, fig. 4 is a diagram illustrating another isocenter calibration method for radiotherapy equipment according to an embodiment of the present application. The isocenter correction method of a radiotherapy apparatus is applied to the processing apparatus 103 in the isocenter correction system of the radiotherapy apparatus shown in fig. 1. The isocenter correction method of the treatment apparatus may include:
Wherein each image group includes two images captured when the imaging section is located at two opposite positions, and the two images are images including the same barrier.
In the embodiment of the present application, after the blocking body is installed at the isocenter of the radiotherapy apparatus, the processing apparatus may control the imaging part in the radiotherapy apparatus to image the blocking body. The imaging part of the radiotherapy equipment can obtain at least one image group after shooting the blocking body at different positions, and the imaging part of the radiotherapy equipment can send the at least one image group shot by the imaging part of the radiotherapy equipment to the processing equipment, so that the processing equipment can acquire the at least one image group.
For example, the number of the at least one image assembly in the radiotherapy apparatus is two, and the two image sets may correspond to the X-axis direction and the Z-axis direction in the coordinate system of the radiotherapy apparatus, respectively.
When the imaging part of the radiotherapy equipment needs to acquire two images in the image group corresponding to the X-axis direction, the imaging part of the radiotherapy equipment needs to shoot the blocking body in the Z-axis direction, namely, the two images in the image group corresponding to the X-axis direction are the images shot by the imaging part in the Z-axis direction; when the imaging part of the radiotherapy apparatus needs to acquire two images in the image group corresponding to the Z-axis direction, the imaging part of the radiotherapy apparatus needs to capture the blocking body in the X-axis direction, that is, the two images in the image group corresponding to the Z-axis direction are the images captured by the imaging part in the X-axis direction.
For example, referring to fig. 5, fig. 5 is a schematic diagram illustrating an image group acquired by an imaging unit according to an embodiment of the present disclosure. When the radiation source 1012a in the imaging portion rotates to a position of 0 ° under the driving of the rotating gantry, the detector 1012b in the imaging portion is located at a position of 180 °, and an image obtained by the imaging portion by shooting the barrier 102 in the X-axis direction (positive or negative) is one of the images in the image group corresponding to the Z-axis direction. When the radiation source 1012a in the imaging portion is rotated to a 180 ° position by the driving of the rotating gantry, the detector 1012b in the imaging portion is located at a 0 ° position, and an image obtained by the imaging portion by shooting the barrier 102 in the X-axis direction (positive or negative) is the other image in the image group corresponding to the Z-axis direction. It should be noted that, for convenience of the following description, when the radiation source 1012a in the imaging portion is located at the 0 ° position and the detector 1012b is located at the 180 ° position, an image of the blocking body 102 captured by the imaging portion may be referred to as a 0 ° image; when the source 1012a and the detector 1012b in the imaging section are located at 180 ° and 0 °, an image of the barrier 102 captured by the imaging section is referred to as a 180 ° image. That is, the image group corresponding to the Z-axis direction includes: a 0 ° image and a 180 ° image.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating an image group acquired by an imaging unit according to an embodiment of the present disclosure. When the radiation source 1012a in the imaging portion is rotated to a 90 ° position by the driving of the rotating gantry, the detector 1012b in the imaging portion is located at a 270 ° position, and an image obtained by the imaging portion by shooting the blocking body 102 in the Z-axis direction (positive or negative) is one of the images in the image group corresponding to the X-axis direction. When the radiation source 1012a in the imaging portion is rotated to a 270 ° position by the driving of the rotating gantry, the detector 1012b in the imaging portion is located at a 90 ° position, and an image obtained by the imaging portion by shooting the blocking body 102 in the Z-axis direction (positive direction or negative direction) is the other image in the image group corresponding to the X-axis direction. It should be noted that, for convenience of the following description, when the radiation source 1012a in the imaging portion is located at a 90 ° position and the detector 1012b is located at a 270 ° position, an image of the blocking body 102 captured by the imaging portion may be referred to as a 90 ° image; when the source 1012a and the detector 1012b in the imaging unit are located at 270 ° and 90 °, the imaging unit captures an image of the barrier 102, which is referred to as a 270 ° image. That is, the image group corresponding to the Z-axis direction includes: a 90 ° image and a 270 ° image.
And 302, determining deviation between two blocking bodies in the image group in the corresponding coordinate axis direction based on the corresponding relation between the at least one image group and the at least one coordinate axis direction.
In this embodiment, after the processing device acquires the at least one image group, the processing device may determine a deviation between two blocking bodies in the image group in a corresponding coordinate axis direction based on a correspondence relationship between the at least one image group and the at least one coordinate axis direction.
For example, if the processing device acquires both the image group corresponding to the Z-axis direction and the image group corresponding to the X-axis direction, the processing device needs to determine a deviation between two blockers in the image group corresponding to the Z-axis direction in the Z-axis direction and a deviation between two blockers in the image group corresponding to the X-axis direction in the X-axis direction.
In the present application, if the isocenter of the radiotherapy apparatus coincides with the treatment isocenter, the imaging unit of the radiotherapy apparatus photographs the blocking bodies at the isocenter at two relative positions, and then the two blocking bodies in the two photographed images coincide with each other in the same coordinate system, or even if the two blocking bodies do not coincide with each other in the same coordinate system, the deviation between the two blocking bodies is small, for example, the deviation between the two blocking bodies is less than 0.1 mm. If the isocenter of the radiotherapy equipment is not coincident with the treatment isocenter, the imaging part of the radiotherapy equipment shoots the blocking body at the isocenter at two relative positions, the two blocking bodies in the two shot images are not coincident in the same coordinate system, and the deviation between the two blocking bodies is large.
The embodiment of the present application will be described with respect to the deviations existing in the image group corresponding to the Z-axis direction and the deviations existing in the image group corresponding to the X-axis direction, respectively, in the following two aspects.
In a first aspect, for a group of images corresponding to a Z-axis direction. When the isocenter of the radiotherapy device coincides with the treatment isocenter, as shown in fig. 7, fig. 7 is a schematic diagram of an image group corresponding to the Z-axis direction provided by the embodiment of the present application, and the positions of two barriers in the same coordinate system in the 0 ° image and the 180 ° image in the image group corresponding to the Z-axis direction substantially coincide. When the isocenter of the radiotherapy device is not coincident with the treatment isocenter, as shown in fig. 8, fig. 8 is a schematic view of another image group corresponding to the Z-axis direction provided in the embodiment of the present application, and the positions of two blocking bodies in the 0 ° image and the 180 ° image in the image group corresponding to the Z-axis direction in the same coordinate system do not coincide with each other, and the deviation between the two blocking bodies is large.
In the image group corresponding to the Z-axis direction, both the 0 ° image and the 180 ° image are images in the YZ plane in the three-dimensional coordinate system of the radiotherapy apparatus. For this purpose, the two barriers in the 0 ° image and the 180 ° image can be compared in the YZ coordinate system. Here, the vertical direction in the 0 ° image and the 180 ° image may be the Y-axis direction, and the horizontal direction may be the Z-axis direction.
In a second aspect, for an image group corresponding to the Z-axis direction. When the isocenter of the radiotherapy device coincides with the treatment isocenter, as shown in fig. 9, fig. 9 is a schematic diagram of an image group corresponding to the X-axis direction provided by the embodiment of the present application, and the positions of two barriers in the same coordinate system in a 90 ° image and a 270 ° image in the image group corresponding to the X-axis direction substantially coincide. When the isocenter of the radiotherapy device is not coincident with the treatment isocenter, as shown in fig. 10, fig. 10 is a schematic diagram of another image group corresponding to the X-axis direction provided by the embodiment of the present application, and the positions of two blocking bodies in the 90 ° image and the 270 ° image in the image group corresponding to the X-axis direction do not coincide with each other in the same coordinate system, and the deviation between the two blocking bodies is large.
In the image group corresponding to the X-axis direction, both the 90 ° image and the 270 ° image are images in the XY plane in the three-dimensional coordinate system of the radiotherapy apparatus. For this purpose, the two barriers in the 90 ° image and the 270 ° image can be compared in the XY coordinate system. Among them, the vertical direction in the 90 ° image and the 270 ° image may be the Y-axis direction, and the horizontal direction may be the X-axis direction.
For this reason, if the isocenter of the radiotherapy apparatus does not coincide with the treatment isocenter, and after the processing apparatus acquires at least one image group, the processing apparatus may determine a distance between centers of two blocking bodies in the image group in the corresponding coordinate axis direction as a deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction.
For example, the processing device may determine a deviation between two barriers in the image group in the corresponding coordinate axis direction based on the correspondence of the at least one image group to the at least one coordinate axis direction, and may include the steps of:
and step A1, determining coordinate values of the center point of each barrier in the image group in the corresponding coordinate axis direction based on the corresponding relation between the at least one image group and the at least one coordinate axis direction.
In this embodiment of the application, after the at least one image group is acquired, the processing device may determine, based on a correspondence relationship between the at least one image group and at least one coordinate axis direction, a coordinate value of a center point of each barrier in the image group in the corresponding coordinate axis direction.
For example, for an image group corresponding to the Z-axis direction, since both images in the image group are images within the YZ plane in the coordinate system of the radiotherapy apparatus. Therefore, the radiotherapy equipment can respectively determine the coordinate values of the contour points of the barriers in the two images in the YZ coordinate system, and determine the coordinate of the center point of each barrier based on the coordinate of each contour point, so as to obtain the coordinate value of the center point of each barrier in the image group corresponding to the Z-axis direction in the Z-axis direction.
Likewise, the processing device may obtain coordinate values of the center point of each barrier in the image group corresponding to the X-axis direction in the X-axis direction.
Step B1, determining a deviation between two barriers in the image group in the corresponding coordinate axis direction based on the coordinate values of the center point of each barrier in the image group in the corresponding coordinate axis direction.
In this embodiment of the application, after the processing device determines the coordinate value of the center point of each blocking body in the image group in the corresponding coordinate axis direction, the processing device may determine a deviation between two blocking bodies in the image group in the corresponding coordinate axis direction based on the coordinate value of the center point of each blocking body in the image group in the corresponding coordinate axis direction.
For example, the processing device may determine a difference value between coordinate values of center points of two barriers in the image group in the corresponding coordinate axis direction as a deviation between the two barriers in the image group in the corresponding coordinate axis direction.
It should be noted that when the isocenter of the radiotherapy apparatus is shifted upward in the Z-axis direction relative to the treatment isocenter, the isocenter of the radiotherapy apparatus needs to be corrected downward in the Z-axis direction subsequently; when the isocenter of the radiotherapy device is shifted downward in the Z-axis direction with respect to the treatment isocenter, it is subsequently necessary to correct the isocenter of the radiotherapy device upward in the Z-axis direction.
For the purpose of subsequent correction, it can be provided that the deviations between the two barriers in the image group in the corresponding coordinate axis direction are positive when the isocenter of the radiotherapy apparatus is shifted upwards in the Z-axis direction, and negative when the isocenter of the radiotherapy apparatus is shifted downwards in the Z-axis direction. Thus, subsequently, by means of this signed deviation, the calculated offset of the isocenter of the radiotherapy apparatus in the Z-axis direction is also signed. For example, the amount of shift when the isocenter of the radiotherapy apparatus is shifted upward in the Z-axis direction is positive, or the amount of shift when the isocenter of the radiotherapy apparatus is shifted upward in the Z-axis direction is negative. Therefore, when the isocenter of the radiotherapy equipment is corrected subsequently, no matter the isocenter of the radiotherapy equipment is shifted upwards or downwards in the Z-axis direction, the correction of the isocenter of the radiotherapy equipment in the Z-axis direction can be realized by subtracting the signed offset from the current coordinate value of the isocenter of the radiotherapy equipment in the Z-axis direction.
For example, as shown in fig. 8, when the isocenter of the radiotherapy apparatus is shifted upward in the Z-axis direction, the barrier in the 0 ° image is shifted to the left, and the barrier in the 180 ° image is shifted to the right, at this time, the processing apparatus may take a difference value between the coordinate value of the center point of the barrier in the 0 ° image in the Z-axis direction and the coordinate value of the center point of the barrier in the 180 ° image in the Z-axis direction as: the two barriers in the image group deviate in the Z-axis direction, and the deviation is positive.
As shown in fig. 11, fig. 11 is a schematic diagram of an image group corresponding to the Z-axis direction when the isocenter of the radiotherapy apparatus is shifted downward in the Z-axis direction according to the embodiment of the present application. When the isocenter of the radiotherapy apparatus is shifted downward in the Z-axis direction, the barrier in the 0 ° image is shifted to the right, and the barrier in the 180 ° image is shifted to the left, at this time, the processing apparatus may take a difference value between a coordinate value of the center point of the barrier in the 0 ° image in the Z-axis direction and a coordinate value of the center point of the barrier in the 180 ° image in the Z-axis direction as: the two barriers in the image group deviate in the Z-axis direction, and the deviation is negative.
For this reason, regardless of whether the isocenter of the radiotherapy apparatus is shifted upward or downward in the Z-axis direction, for the image group corresponding to the Z-axis direction, the difference between the coordinate value of the center point of the barrier in the 0 ° image in the image group in the Z-axis direction and the coordinate value of the center point of the barrier in the 180 ° image in the Z-axis direction can be taken as: the two blocking bodies are offset in the Z-direction.
Similarly, regardless of whether the isocenter of the radiotherapy apparatus is shifted to the left or to the right in the X-axis direction, for the image group corresponding to the X-axis direction, the difference between the coordinate value of the center point of the barrier in the 90 ° image in the image group in the X-axis direction and the coordinate value of the center point of the barrier in the 270 ° image in the X-axis direction may be taken as: the two barriers are offset in the X-axis direction.
And step 303, determining the offset of the isocenter of the radiotherapy equipment in the corresponding coordinate axis direction based on the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction.
In the embodiment of the present application, after the processing device determines the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction, the processing device may determine the amount of deviation of the isocenter of the radiotherapy device in the corresponding coordinate axis direction based on the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction.
In this application, please refer to fig. 12, fig. 12 is a graph illustrating a relationship between a deviation and an offset on a Z-axis according to an embodiment of the present application. When the ray source in the imaging part is located at a 0-degree position and the detector in the imaging part is located at a 180-degree position, the position of the central point of the blocking body in a 0-degree image obtained by shooting the blocking body by the imaging part is a position 1; when the ray source in the imaging part is located at a 180-degree position and the detector in the imaging part is located at a 0-degree position, the position of the central point of the blocking body in a 180-degree image obtained by shooting the blocking body by the imaging part is a position 2. After the coordinate system of the 0 degree image and the coordinate system of the 180 degree image are unified, the position of the central point of the blocking body in the 180 degree image is the position 2 ', and the difference value between the coordinate value of the position 1 in the Z-axis direction and the coordinate value of the position 2' in the Z-axis direction is the deviation d between the coordinate system of the 0 degree image and the two blocking bodies in the 180 degree imageZ。
In fig. 12, O is the treatment isocenter; o' is the isocenter of radiotherapy equipment; dZIs the offset of the isocenter of the radiotherapy equipment in the Z-axis direction.
Thus, according to the triangle similarity principle, the following formula can be obtained:
wherein, S1 is the distance between the radiation source and the isocenter O' of the radiotherapy equipment; s2 is the distance from the ray source to the detector after passing through the isocenter of the radiotherapy equipment.
Similarly, according to a similar principle, the deviation d in the X-axis direction between two barriers in the image group corresponding to the X-axis can be obtainedxAnd the offset D of the isocenter of the radiotherapy equipment in the X-axis directionXThe following formula is satisfied:
in this way, the deviation d in the Z axis of the two blockers in the image group corresponding to the Z axis is acquired by the processing deviceZThen, the offset D of the isocenter of the radiotherapy apparatus in the Z-axis direction can be calculated by the above formula (1)Z(ii) a Obtaining the deviation d of two barriers on the X axis in the image group corresponding to the X axis by the processing deviceXThen, the offset D of the isocenter of the radiotherapy apparatus in the X-axis direction can be calculated by the above formula (2)X. It should be noted that d is determined by the above step 302ZAnd dXAll have a sign, and thus D is calculated by the above formula (1)ZAnd D calculated by the above formula (2)XBoth contain the sign.
Combining the above equation (1) and equation (2) to obtain an offset calculation formula, which is:
wherein d is the deviation between two barriers in the image group in the corresponding coordinate axis direction; d is the offset of the isocenter in the corresponding coordinate axis direction.
Therefore, after acquiring the deviation of the two blocking bodies in any image group in the corresponding coordinate axis direction, the processing device can obtain the deviation of the isocenter of the radiotherapy device in the corresponding coordinate axis direction through the deviation amount calculation formula.
And step 304, correcting the isocenter of the radiotherapy equipment based on the offset.
In this embodiment of the application, after the processing device obtains the offset of the radiotherapy device in the coordinate axis direction, the processing device may correct the isocenter of the radiotherapy device based on the offset.
For example, the processing device may correct the isocenter of the radiotherapy device using a correction formula based on the offset. Wherein the correction formula is:
O1＝O2-D；
wherein, O2The coordinate values of the isocenter of the radiotherapy equipment before correction in a certain coordinate axis direction; o is1Is the corrected coordinate value of the isocenter of the radiotherapy equipment in the coordinate axis direction.
For example, assuming that the isocenter of the radiotherapy apparatus is shifted upward in the Z-axis direction, the shift amount of the isocenter of the radiotherapy apparatus in the Z-axis direction can be calculated to be positive according to step 303. In this case, the processing device needs to subtract the offset from the current coordinate value of the isocenter of the radiotherapy device in the Z-axis direction, which corresponds to moving the isocenter of the radiotherapy device downward, and the obtained new coordinate value in the Z-axis direction is only the coordinate value corrected for the isocenter of the radiotherapy device. Assuming that the isocenter of the radiotherapy apparatus is shifted downward in the Z-axis direction, the shift amount of the isocenter of the radiotherapy apparatus in the Z-axis direction can be calculated as negative in step 303. In this case, the processing device needs to subtract the offset from the current coordinate value of the isocenter of the radiotherapy device in the Z-axis direction, which corresponds to moving the isocenter of the radiotherapy device upward, and obtain new coordinate values in the Z-axis direction, which are only coordinate values obtained by correcting the isocenter of the radiotherapy device. In this way, the isocenter of the radiotherapy apparatus can be corrected in the Z-axis direction.
In the same way, the isocenter of the radiotherapy equipment can be corrected in the X-axis direction.
It should be noted that, since the offset amount of the isocenter of the radiotherapy apparatus in the Y-axis direction is generally small, the isocenter of the radiotherapy apparatus does not need to be corrected in the Y-axis direction in the embodiment of the present application.
In the embodiment of the present application, after the treatment device corrects the isocenter of the radiotherapy device, subsequently, the radiotherapy device needs to compensate the movement of the treatment couch according to the corrected isocenter, so as to ensure that the isocenter of the radiotherapy device can coincide with the treatment isocenter as much as possible.
It should be noted that, the order of the steps of the isocenter calibration method for radiotherapy equipment provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be increased or decreased according to the situation, and any method that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application should be covered in the protection scope of the present application, and therefore, no further description is provided.
In summary, according to the isocenter correction method for radiotherapy equipment provided in the embodiment of the present application, at least one image group including the same blocking body is obtained by the imaging unit, and then the isocenter of the radiotherapy equipment can be corrected by analyzing the deviation of the two blocking bodies in each image group in the corresponding coordinate axis direction. The isocenter of the radiotherapy equipment is not required to be corrected in a mode of manually analyzing films, and the correction efficiency of the isocenter of the radiotherapy equipment is effectively improved. And, at the in-process of rectifying the isocenter to radiotherapy equipment, only need radiotherapy equipment's formation of image portion to carry out work, need not radiotherapy equipment's treatment head work, and the radiation that treatment head produced at the during operation is far greater than the radiation that formation of image portion produced at the during operation, consequently, the isocenter of radiotherapy equipment that this application provided carries out the calibration in-process, can also effectual reduction radiant mass.
An embodiment of the present application further provides an isocenter calibration system of a radiotherapy apparatus, as shown in fig. 1, the system 100 may include: a radiotherapy device 101, a barrier 102 and a treatment device 103.
Wherein the radiotherapy apparatus 101 comprises: and an imaging part 1012, wherein the imaging part 1012 is used for shooting the blocking body 102. The blocking body 102 is removably mounted at the isocenter of the radiotherapy device 101, the center of the blocking body coinciding with the isocenter of the radiotherapy device 101.
The processing device 103 used for the isocenter correction method of the radiotherapy device shown in fig. 2 or fig. 3 is connected to the imaging section 1012.
Alternatively, the imaging section 1012 includes: source 1012a and detector 1012b are oppositely disposed.
Optionally, the isocenter calibration system 100 of the radiotherapy apparatus may further include: the detection die body 104, the blocking body 102 is installed at the central position of the detection die body 104, and the blocking body 102 is detachably installed at the isocenter of the radiotherapy equipment 101 through the detection die body 104.
It should be noted that, the working principle of the isocenter calibration system of the radiotherapy apparatus may refer to the corresponding content in the foregoing embodiment of the isocenter verification method of the radiotherapy apparatus, and details of the embodiment of the present application are not described herein again.
The present application also provides a correction device for the isocenter of a radiotherapy apparatus, and the correction device for the isocenter of the radiotherapy apparatus may be the treatment apparatus in the above embodiments. The authentication apparatus may include: a processor and a memory, the memory having stored therein at least one instruction, the instruction being loaded and executed by the processor to implement the isocenter correction method of a radiotherapy apparatus shown in fig. 2 or fig. 3.
The embodiment of the application also provides a computer readable storage medium. The computer readable storage medium has stored therein instructions which, when run on a processing assembly, cause the processing assembly to perform an isocentric correction method of a radiotherapy apparatus as illustrated in fig. 2 or 3.
In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.
Claims (10)
1. An isocenter correction method of a radiotherapy apparatus, the method comprising:
acquiring at least one image group shot by an imaging part of radiotherapy equipment, wherein each image group comprises two images shot when the imaging part is positioned at two opposite positions, and the two images are images containing the same barrier;
determining deviation between two blocking bodies in the image group in the corresponding coordinate axis direction based on the corresponding relation between the at least one image group and at least one coordinate axis direction;
and correcting the isocenter of the radiotherapy equipment on the basis of the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction.
2. The method of claim 1, wherein correcting the isocenter of the radiotherapy apparatus based on a deviation between two barriers in the set of images in a corresponding coordinate axis direction comprises:
determining the offset of the isocenter of the radiotherapy equipment in the corresponding coordinate axis direction based on the deviation between two blocking bodies in the image group in the corresponding coordinate axis direction;
correcting the isocenter based on the offset amount.
3. The method of claim 2, wherein determining an offset of the isocenter of the radiotherapy apparatus in a corresponding coordinate axis direction based on a deviation between two blocking bodies in the set of images in the corresponding coordinate axis direction comprises:
determining the offset of the isocenter in the corresponding coordinate axis direction by adopting an offset calculation formula based on the deviation between two blocking bodies in the image group in the corresponding coordinate axis direction;
wherein, the offset calculation formula is as follows:
wherein d is the deviation between two barriers in the image group in the corresponding coordinate axis direction; d is the offset of the isocenter in the corresponding coordinate axis direction; s1 is the distance between the source of radiation in the imaging portion and the isocenter; s2 is the distance from the ray source in the imaging part to the detector after passing through the isocenter.
4. The method of claim 3, wherein correcting the isocenter based on the offset comprises:
correcting the isocenter by adopting a correction formula based on the offset;
wherein the correction formula is:
O1＝O2-D；
wherein, O1The coordinate values of the isocenter after correction in the corresponding coordinate axis direction are obtained; o is2And the coordinate values of the isocenter in the corresponding coordinate axis direction before correction are obtained.
5. The method of claim 1, wherein determining a deviation between two barriers in the set of images in a corresponding coordinate axis direction based on the correspondence of the at least one set of images to at least one coordinate axis direction comprises:
determining coordinate values of the central point of each barrier in the image group in the corresponding coordinate axis direction based on the corresponding relation between the at least one image group and at least one coordinate axis direction;
and determining the deviation between the two blocking bodies in the image group in the corresponding coordinate axis direction based on the coordinate values of the central point of each blocking body in the image group in the corresponding coordinate axis direction.
6. The method according to claim 1, wherein the number of the at least one image group is two, and the two image groups correspond to an X-axis direction and a Z-axis direction in a coordinate system of the radiotherapy apparatus, respectively;
wherein two images in the image group corresponding to the Z-axis direction are images captured by the imaging part in the X-axis direction; two images in the image group corresponding to the X-axis direction are images captured by the imaging unit in the Z-axis direction.
7. An isocentric calibration system for a radiotherapy apparatus, the system comprising: radiotherapy apparatus, a barrier and a treatment apparatus, wherein,
the radiotherapy apparatus comprises: an imaging section for photographing the blocking body;
the blocking body is detachably arranged at the isocenter of the radiotherapy equipment, and the center of the blocking body is superposed with the isocenter of the radiotherapy equipment;
the processing device is connected to the imaging section, and the processing device is configured to execute the isocenter correction method of the radiotherapy device according to any one of claims 1 to 6.
8. The system according to claim 7, wherein the imaging section includes: the radiation source and the detector are oppositely arranged.
9. The system of claim 7, further comprising: the detection die body, the stopper install detect the central point of die body department, the stopper pass through the detection die body demountable installation in radiotherapy equipment's isocenter department.
10. A computer-readable storage medium having stored therein at least one instruction which is loaded and executed by a processor to implement the isocenter correction method of a radiotherapy apparatus of any of claims 1 to 6.
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