JP2006116230A - Radiation therapy apparatus and radiation therapy program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation therapy apparatus for dynamic pursuit preventing adverse reactions caused by excessive radiation therapy by switching to the other new therapeutic strategy to secure the amount of radiation to a patient in consideration of previous result of radiation when no treatment can be continued due to lack of recognition of lesion. <P>SOLUTION: The radiation therapy apparatus is capable of linking two types of therapeutic program composed of a dynamic pursuit radiation and a normal radiation giving a required amount of radiation dosage surely with the radiation therapy apparatus capable of dynamic pursuit therapy program and the normal radiation according to the above mentioned radiation therapy program. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radiation therapy apparatus and a radiation therapy planning method for irradiating radiation by linking two types of therapy plans.

  In radiation therapy, the patient is moved by breathing in order to increase the irradiation accuracy of the patient's affected area (cancerous lesion) and to prevent irradiation of normal cellular tissue other than the affected area. It has been performed to irradiate the affected area with radiation while tracking the affected area. Thereby, the radiation dose irradiated to an affected part by one irradiation treatment can be increased, and conversely the radiation dose irradiated to the surrounding normal cell tissue can be reduced as much as possible. And the frequency | count of irradiation treatment with respect to an affected part can be reduced. As a result, the physical burden on the patient can be reduced and the influence of radiation irradiation on normal cellular tissue can be minimized.

The whole structure of the conventional radiotherapy apparatus is shown in FIG. The conventional radiotherapy apparatus 1 acquires a fluoroscopic image for confirming the position of the treatment bed 9 for laying the patient P, the radiation generator 2 that emits the therapeutic radiation, and the affected part in the body of the patient P. A plurality of radiation sources 13a and 13b and detectors 14a and 14b (imagers).

  The entire system of the radiation therapy apparatus 1 has a coordinate system with an isocenter 10 described later as an origin. The position of the radiation axis A of the radiation emitted from the radiation generator 2 is controlled in a coordinate system with the isocenter 10 as the origin.

  The radiation generator 2 that emits therapeutic radiation, and a plurality of radiation sources 13a and 13b and detectors 14a and 14b (imagers) for confirming the position of the affected part in the body of the patient P The rotating member 15 is inscribed inside and is rotatable about the rotation axis G by 360 degrees. Both guide shafts of the guide 3 are fitted to the support member 4, and the guide 3 is rotatable around the tilt shaft 11 by driving of a drive motor 4 a disposed on the support member 4. The rotation axis G and the tilt axis 11 are orthogonal to each other. When the cylindrical surface of the guide 3 is oriented vertically, the radiation generating device 2 is disposed via a movable member 5 on a perpendicular passing through the center of the circular frame of the guide 3 as seen in FIG. A plurality of radiation sources 13a and 13b and detectors 14a and 14b (imagers) are arranged at positions on the rotation member 15 as a target with respect to the radiation generator 2, and the radiation axes E and F are respectively , Directed to the center of the circular frame of the guide 3.

  The radiation generator 2 is mounted on the rotating member 15 via the movable member 5 as described above, and the movable member 5 is rotatable with respect to the two axial directions of the rotation axes C and D that are orthogonal to each other. . For this reason, the radiation radiation axis A of the radiation generator 2 is finely moved in the V and U directions, and the directing direction of the radiation radiation axis A is adjusted. Further, when the radiation axis A of the radiation generator 2 is finely moved in the V and U directions, the moving body is tracked with respect to the affected part of the patient P that is the irradiation target of the radiation irradiated from the radiation generator 2.

Fine adjustments are made so that the radiation axes E and F of the imager radiation sources 13 a and 13 b pass through the isocenter 10. The imager detectors 14 a and 14 b are always arranged on the rotating member 15. Thereby, the affected part of the patient P who is the irradiation target is monitored in real time by the imager.

  Hereinafter, a procedure for tracking the radiation axis A of the radiation generating apparatus 2 at the center of the affected area of the patient P in order to dynamically track and irradiate the affected area of the patient P will be described.

  Before the radiotherapy, a CT tomogram in the vicinity of the affected area of the patient is taken by an X-ray CT scanner (Computed Tomography Scanner). Based on this CT image, the direction of radiation irradiated to the affected area, the irradiation range, and the radiation dose are determined, and a treatment plan is created. When the treatment plan is created, a dose distribution simulation is executed by the computer, and the radiation absorption amount in the affected part and the organ part is calculated. The simulation confirms whether the radiation dose in the affected area is sufficient, and if there is no problem, the stage of radiation therapy is entered. In addition, a DRR (Digital Reconstructed Radiograph) image is reconstructed based on the CT image for position collation at the time of performing radiotherapy.

  In the radiotherapy, as shown in FIG. 1, the patient P is laid on the treatment bed 9 and fixed. The treatment bed 9 is moved and adjusted so that the center of the affected area of the patient P substantially matches the isocenter 10. When the affected area of the patient P is set approximately at the isocenter 10, radiation for obtaining fluoroscopic images is emitted from the radiation sources 13a and 13b of the imager along the radiation axes E and F, respectively, and an image of the affected area of the patient P is obtained. Captured in real time by imager detectors 14a and 14b. The acquired image of the imager is input to the analysis device 7. A DRR image that has already been created at the time of treatment planning and includes position information of the affected area is input to the analysis device 7. From the relative positional relationship between the position of the affected area in the DRR image and the acquired current imager image, how much the current affected area is deviated from the isocenter 10 is calculated. The calculated deviation amount data between the affected area and the isocenter 10 is input from the analysis device 7 to the control device 8. The control device 8 finely moves the radiation axis A of the radiation generating device 2 in the V and U directions based on the input deviation amount data, thereby tracking the moving object with respect to the affected part of the radiation irradiated from the radiation generating device 2. Is made.

  At the time of actual radiotherapy, the movement of the affected part due to the respiration of the patient P is further added. The movement of the affected part due to the breathing of the patient P is about ± 20 mm. In order to track this movement, the radiation axis A of the radiation generator 2 is finely moved in the V and U directions. Dynamic tracking is performed for the movement of the affected area.

  In addition, the purpose of radiation therapy is to kill tumor cells in the body by radiation, but normal tissues around the affected area, which is an irradiation target, are also affected by radiation exposure. Therefore, in order to reduce the side effects due to exposure by normal cell recovery effects, do not irradiate a dose enough to kill the tumor cells at a time, but divide it into several to several tens of times daily or several times. A method of performing irradiation every other day is generally performed.

  However, in the moving body tracking irradiation in which the affected part is identified by the fluoroscopic images by the radiation sources 13a and 13b and the detectors 14a and 14b (imagers) and the movement of the affected part as the irradiation target is tracked, divided treatment is performed. In the course of progress, when the affected area is reduced by the treatment, the affected area cannot be identified from the fluoroscopic image, so that the dynamic tracking irradiation cannot be continued. In this case, as is generally done, irradiation is performed based on a treatment plan that is designed considering the entire movement range of the affected part due to breathing or the like as the affected part. The planning of this treatment plan is an operation for optimizing a plurality of irradiation directions in order to concentrate the necessary dose on the affected area while reducing the amount of exposure around the affected area, and it takes several days for the planning. However, if an interruption period is set for a patient in the middle of treatment, the tumor that has shrunk due to radiation will recover, so that if the situation described above occurs, it can be switched to another treatment plan immediately. An alternative treatment plan needs to be developed. Furthermore, since these two types of treatment plans are intended for the same human body, normal cells can be tolerated unless the treatment plans are switched in consideration of the effect of performing dynamic tracking irradiation in advance. There is a possibility of irradiation exceeding the radiation dose, and there is a risk of side effects due to radiation.

  In relation to such technology, the following proposals have been made.

  In “radiotherapy planning apparatus and radiotherapy planning method” disclosed in Japanese Patent Application Laid-Open No. 2001-327514, a radiotherapy plan is formulated based on an image acquired by exposing an X-ray to a subject. In the radiotherapy planning apparatus, an image generating means for generating a plurality of images according to the difference in phase data relating to the subject, a means for setting and inputting a target shape for a target site existing on the image for the image, There has been proposed a radiotherapy planning apparatus having a plurality of images corresponding to differences in phase data and image display means for displaying a target shape in a superimposed manner.

JP 2001-327514 A

  The object of the present invention is to switch to a new treatment plan in consideration of the radiation dose irradiated in the past when the treatment cannot be continued because the affected part cannot be recognized in the radiotherapy device that performs dynamic tracking. By implementing, it is providing the radiotherapy apparatus which grasps | ascertains the radiation dose irradiated to a patient reliably and prevents the side effect by irradiation of an excessive radiation.

  Hereinafter, means for solving the problems will be described using the numbers and symbols used in [Best Mode for Carrying Out the Invention] in parentheses. These numbers and symbols are added to clarify the correspondence between the description of [Claims] and the description of [Best Mode for Carrying Out the Invention]. It should not be used to interpret the technical scope of the invention described in “

  The radiation therapy apparatus (10) of the present invention emits radiation along radiation axes (E, F) passing through the isocenter (100) and a radiation generator (20) that emits radiation along the radiation axis (A). Corresponding to the plurality of fluoroscopic image radiation generating devices (130a, 130b) and the plurality of fluoroscopic image radiation generating devices (130a, 130b), respectively, are arranged at positions symmetrical with respect to the isocenter (100). A plurality of detectors (140a, 140b) and the position information of the irradiation target in the treatment plan image, and the image information and treatment plan of the detected image near the irradiation target detected by the plurality of detectors (140a, 140b) An image collation device (200) for determining the irradiation target position in the detected image by collating with the position information of the irradiation target in the time image; An analysis device (80) that calculates the relative position between the irradiation target position and the isocenter (100) based on the target position, and the irradiation axis to the center of the irradiation target based on the relative position information between the irradiation target position and the isocenter (100). A control device (80) that moves and controls the radiation generation device (20) to emit radiation based on the set treatment plan.

  Moreover, the treatment plan concerning the radiotherapy apparatus (10) of this invention is a dynamic tracking treatment plan or a non-tracking treatment plan.

  The radiotherapy apparatus (10) according to the present invention further includes a treatment plan selection apparatus (300) that holds a plurality of treatment plan candidates and selects a treatment plan from the treatment plan candidates.

  The treatment plan selection program of the present invention is provided in the radiation treatment apparatus (10) and causes the control apparatus (80) to perform radiation emission control based on the treatment plan to be selected. A treatment plan selection device (300) provided in the radiotherapy device (10), which is a selection program, includes a CPU (300a) and a RAM (300b) connected to the bus line (300c). (300b) stores a treatment plan selection program. The CPU (300a) reads the treatment plan selection program via the bus line (300c). The read treatment plan selection program is read by the CPU (300a). When executed, the control device (80) is made to perform radiation emission control based on the treatment plan to be selected.

  The radiotherapy planning method of the present invention includes a radiation generator (20), a plurality of fluoroscopic image radiation generators (130a, 130b), and a plurality of fluoroscopic image radiation generators (130a, 130b) in advance. A plurality of detectors (140a, 140b) arranged at positions symmetrical with respect to the isocenter (100) corresponding to each, and an image verification device (200) that holds position information of the irradiation target in the treatment planning image A radiotherapy apparatus (10) including an analysis apparatus (70), a control apparatus (80), and a treatment plan selection apparatus (300) that holds a plurality of treatment plan candidates. A step of selecting a treatment plan from treatment plan candidates, a step of detecting an image in the vicinity of an irradiation target with a plurality of detectors (140a, 140b), and an image verification device (200) collating the image information of the detected image with the position information of the irradiation target in the image at the time of treatment planning, and measuring the position of the irradiation target in the detection image; The step of calculating the relative position from (100), and the control unit (80), based on the relative position information from the isocenter (100) of the irradiation target, the irradiation axis of the radiation irradiated from the radiation generator to the center of the irradiation target And the control device (80) controls the radiation generating device based on the treatment plan.

  The plurality of treatment plans related to the radiation treatment planning method of the present invention are a dynamic tracking treatment plan image and a non-tracking treatment plan.

  In addition, the treatment planning image related to the radiation treatment planning method of the present invention is a DRR image, and the detection image is a fluoroscopic image.

  In addition, the treatment planning image related to the radiation control method of the present invention is a DRR image, and the detected image is a CT image.

  Further, the treatment planning time image according to the radiation control method of the present invention is a three-dimensional DRR image, and the detected image is a DRR image.

  In the radiation control method according to the present invention, the treatment plan selected by the treatment plan selection device (300) is determined based on the state of the irradiation target of the detected image.

  According to the present invention, it is possible to provide a radiation irradiation apparatus and a radiation treatment planning method capable of reliably irradiating an irradiation target with a dose necessary for treatment.

  In addition, according to the present invention, the absorbed dose of the surrounding organ to be irradiated can be grasped, and the occurrence of side effects due to radiation can be reduced.

  The best mode for carrying out a radiotherapy apparatus and radiotherapy planning method according to the present invention will be described below with reference to the accompanying drawings.

  The present invention determines whether to perform dynamic tracking irradiation or non-tracking irradiation based on the size of the irradiation target when irradiating the irradiation target with radiation from the radiation generation apparatus, and based on these two types of irradiation modes. Two types of treatment plans (irradiation plans) are linked to emit radiation. Thus, the present invention relates to a radiotherapy apparatus and a radiotherapy planning method (radiation irradiation planning method) that can reliably irradiate the irradiation target with a necessary dose.

(Embodiment of the present invention)
FIG. 2 shows the overall configuration of the radiotherapy apparatus according to the embodiment of the present invention. The radiotherapy apparatus 10 according to the present embodiment is a treatment bed 90 for laying a patient P, a radiation generator 20 that emits therapeutic radiation, and a fluoroscopic image acquisition for confirming the position of an affected part in the body of the patient P. A plurality of radiation sources 130a and 130b and detectors 140a and 140b (imagers), an image collating device 200 for measuring the position coordinates of the affected part of a fluoroscopic image acquired by the imager, and a current position of the affected part measured by the image collating apparatus 200 An analysis device 80 for calculating a relative position with respect to the isocenter 100, and a control for aligning the affected portion and the radiation axis A of the radiation generator 20 based on the current position of the affected portion calculated by the analysis device 80 and the relative position with the isocenter 100. Depending on the size of the affected area determined by the device 80 and the fluoroscopic image acquired by the imager, The 療計 image and a treatment plan selection unit 300 for selecting between a dynamic tracking planned and regular non-tracking program. Moreover, the radiation generator 20 is provided with a drive mechanism capable of dynamic tracking irradiation.

  The entire system of the radiation therapy apparatus 10 is set with a coordinate system with an isocenter 100 described later as an origin. The position of the radiation axis A of the radiation emitted from the radiation generator 20 is controlled in a coordinate system with the isocenter 100 as the origin. The affected part of the patient P is also aligned so that the center of the affected part comes to the isocenter 100 at the time of radiation irradiation.

  The radiation generator 20 that emits therapeutic radiation, and a plurality of radiation sources 13 a and 13 b and detectors 140 a and 140 b (imagers) for confirming the position of the affected part in the body of the patient P are a circle of the guide 30. The rotary member 150 is inscribed in the frame and is rotatable about the rotation axis G by 360 degrees. Both guide shafts of the guide 30 are fitted to the support member 40, and the guide 30 is rotatable around the tilt shaft 110 by driving of a drive motor 40a installed on the support member 40. The rotation axis G and the tilt axis 110 are in an orthogonal relationship. When the cylindrical surface of the guide 30 is vertically oriented, the radiation generator 20 is disposed via a movable member 50 on a perpendicular passing through the center of the circular frame of the guide 30 as shown in FIG. The 20 radiation emission axes A are directed to the center of the circular frame of the guide 30. The plurality of radiation sources 130 a and 130 b and the detectors 140 a and 140 b are disposed at target positions with respect to the radiation generation apparatus 20, and the radiation emission axes E and F respectively correspond to the radiation emission of the radiation generation apparatus 20. Similar to the axis A, it is directed to the center of the circular frame of the guide 30.

  The radiation generator 20 is mounted on the rotating member 150 via the movable member 50 as described above, and the movable member 50 is rotatable with respect to the two axial directions of the rotation axes C and D orthogonal to each other. . For this reason, the radiation radiation axis A of the radiation generator 20 is finely moved in the V and U directions, and the directing direction of the radiation radiation axis A is movable.

  In the present embodiment, drive units 50a and 50b are installed on the rotation axes C and D, respectively. Thereby, the radiation radiation axis A irradiated from the radiation generator 20 is dynamically tracked in the U direction and the V direction with respect to the affected part which is the irradiation target.

  The isocenter 100 described above is set at the intersection of the center axis G of the circular frame of the guide 30 and the tilting axis 110, and radiation emission from the radiation axis A of the radiation generator 20, the radiation sources 130a and 130b of the imager. The axes E and F all intersect at one point in the isocenter 100.

  Since the imager detectors 140a and 140b are always disposed on the rotating member 150, the affected area of the patient P is monitored in real time by the imager. In addition, by rotating the rotating member 150 around the rotation axis G and acquiring fluoroscopic images from a plurality of angles, a CT image of the affected area can be configured. Furthermore, a digital reconstructed radiograph (DRR) image is reconstructed from a plurality of CT images.

  Below, based on the radiotherapy planning method concerning this Embodiment, the procedure which irradiates the radiation to the affected part of the patient P with the radiotherapy apparatus 10 is demonstrated.

  Prior to radiotherapy, a CT tomogram in the vicinity of the affected area of the patient P is taken by an X-ray CT scanner (Computed Tomography Scanner). From this CT image, the position and situation of the affected area of the patient P are diagnosed, the direction of the radiation irradiated to the affected area, the irradiation range, and the radiation dose are determined, and a treatment plan is created. In addition, based on a plurality of photographed CT images, a DRR (Digital Reconstructed Radiograph) image of a specified organ and an affected part (cancer lesion) is created. When the treatment plan is created, a dose distribution simulation is executed by the computer, and the radiation absorption amount in the affected part and the organ part is calculated. The simulation confirms whether the radiation dose in the affected area is sufficient, and if there is no problem, the stage of radiation therapy is entered.

  In the radiation therapy, as shown in FIG. 2, the patient P is laid on the treatment bed 90 and fixed. The treatment bed 90 is moved and adjusted so that the affected part of the patient P is positioned at the isocenter 100. When the affected area of the patient P is set approximately at the isocenter 100, radiation for acquiring fluoroscopic images is emitted from the radiation sources 130a and 130b of the imager along the radiation axes E and F, respectively, and an image of the affected area of the patient P is obtained. Acquired by imager detectors 140a and 140b in real time. The acquired image information of the imager is input to the image verification device 200. The image collating apparatus 200 has already received image information of DRR created at the time of treatment planning. In the image collating apparatus 200, the position of the affected part in the DRR image is collated with the affected part corresponding part in the fluoroscopic image acquired this time. And the affected part position of the fluoroscopic image acquired this time is discriminated, and the position coordinate of the affected part is measured.

  In the present embodiment, the affected area by the imager is obtained by taking a fluoroscopic image of the affected area while rotating the radiation sources 130a and 130b and the detectors 140a and 140b (imagers) around the rotation axis G by the rotating member 150. CT images can be constructed. Furthermore, a DRR image can be reconstructed from a plurality of CT images. By comparing the CT image and the DRR image by the imager with the DRR image at the time of the treatment plan in which the affected part position is recorded, a more detailed affected part position in the present situation is determined.

  The coordinate data of the measured position coordinates of the affected part is input to the analysis device 70. In the analysis device 70, how much the current affected part is displaced with respect to the isocenter 100 is calculated. The calculated deviation amount data between the affected area and the isocenter 100 is input from the analysis device 70 to the control device 80. The control device 80 moves the radiation emission axis A around the axes U and V to the center of the affected area in real time based on the input deviation amount data.

  In the present embodiment, a treatment plan selection device 300 is further provided. Two types of treatment plans, a dynamic tracking treatment plan and a normal non-tracking treatment plan, are sent from the treatment plan selection device 300 to the control device 80. A selection signal corresponding to any one treatment plan is transmitted. When a signal corresponding to a normal non-tracking treatment plan is received by the control device 80, the position of the treatment bed 90, the angle of the tilting shaft 110 of the guide 30 and the relative position of the rotating member 150 with respect to the guide 30 are appropriately combined as appropriate. By moving and adjusting at, control is performed to move the center of the affected area to the isocenter 100 in real time. Further, when a signal corresponding to the dynamic tracking treatment plan is received by the control device 80, the radiation emission of the radiation generator 20 is further performed in order to align the movement of the affected part accompanying breathing and the like with the isocenter 100. The axis A is driven in the V and U directions, and the radiation axis A of radiation is dynamically tracked with respect to the moving body affected part. FIG. 3A shows a schematic diagram of an irradiation field with respect to an affected area when there is no dynamic tracking irradiation in radiotherapy. FIG. 3B shows a schematic diagram of an irradiation field with respect to an affected area in the case of dynamic tracking irradiation. As shown in FIGS. 3 (a) and 3 (b), the irradiation field for the affected area when dynamic tracking irradiation is performed is more effective for the affected area than the irradiation field for the affected area when there is no dynamic tracking irradiation. Can be irradiated with radiation. Therefore, when dynamic tracking irradiation is possible, radiation therapy with dynamic tracking irradiation can reduce the number of treatments by irradiating only the affected area with stronger radiation, and normal cells in the peripheral area of the affected area Side effects of radiation on tissues can be reduced.

  During actual radiotherapy, as the number of times of radiotherapy increases, the affected area becomes smaller, and finally it becomes impossible to discriminate on a fluoroscopic image by an imager. For the affected part that cannot be identified, dynamic tracking irradiation cannot be performed, and a signal for selecting irradiation based on a normal non-tracking treatment plan is transmitted from the treatment plan selection device 300 to the control device 80. At this time, the treatment plan selection device 300 has a CPU 300a and a RAM 300b connected to the bus line 300c, and a radiation treatment plan in which two types of treatment plans, a dynamic tracking treatment plan and a normal treatment plan, are linked to the RAM 300b. It is stored. The radiation treatment plan is read by the CPU 300a via the bus line 300c. The CPU 200a transmits data instructing the type of treatment plan and the radiation dose to be emitted this time to the control device 80 based on the type of treatment plan set at that time and the current number of times of irradiation.

  FIG. 4 shows a radiation treatment plan in which two types of treatment plans, a dynamic tracking treatment plan and a normal treatment plan (normal non-tracking treatment plan) in the present embodiment are linked. The radiation treatment plan shows the number of irradiations and the cumulative irradiation dose based on the dynamic tracking treatment plan and the normal treatment plan at each number of irradiations.

  Irradiation is performed in accordance with a dynamic tracking treatment plan at the initial stage of radiation therapy and at a large time in the affected area. In FIG. 4, for example, it is assumed that the affected area cannot be discriminated from the fluoroscopic image obtained by the imager in the sixth irradiation therapy. The irradiation treatment following the irradiation treatment based on the sixth dynamic tracking treatment plan is switched to the one based on the normal treatment plan by the selection signal transmitted from the treatment plan selection device 300 to the control device 80. At the end of the sixth irradiation treatment, the cumulative irradiation dose to the affected part by the dynamic tracking treatment plan is 600 cGy, and this cumulative irradiation dose corresponds to the seventh treatment (cumulative dose 560 cGy) or 8 in the normal treatment plan. This is the second time (cumulative dose 640 cGy). Whether the number of irradiations is to be shifted to the seventh time (cumulative dose 560 cGy) or the eighth time (cumulative dose 640 cGy) in this normal treatment plan is determined each time according to the healing status of the affected area. Then, based on the normal treatment plan, when the cumulative irradiation amount to the affected area reaches the amount specified at the time of the treatment plan, the radiotherapy is terminated.

  According to the present embodiment, it is possible to reliably irradiate only the affected area with a dose necessary for treatment. In addition, radiation treatment is performed based on a radiation treatment plan that links two types of treatment plans, a dynamic tracking treatment plan and a normal treatment plan, so that the absorbed dose in the affected area and surrounding organs can be accurately grasped. The occurrence of side effects due to radiation can be reduced.

It is a perspective view which shows the conventional radiotherapy apparatus. It is a perspective view which shows the radiotherapy apparatus concerning embodiment of this invention. (A) It is a schematic diagram of the irradiation field with respect to the affected part in case there is no dynamic tracking irradiation concerning embodiment of this invention. (B) It is a schematic diagram of the irradiation field with respect to the affected part in the case of dynamic tracking irradiation. It is a figure which shows the radiation treatment plan (what linked two types of treatment plans, a dynamic tracking treatment plan and a normal treatment plan) based on the radiation treatment planning method concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 ... Radiation therapy apparatus 2, 20 ... Radiation generation apparatus 3, 30 ... Guide 4, 40 ... Support member 4a, 40a ... Drive motor 5, 50 ... Movable member 7, 70 ... Analysis apparatus 8, 80 ... Control apparatus 9, 90 ... therapeutic bed 10, 100 ... isocenter 11, 110 ... tilting shafts 13a, 13b, 130a, 130b ... radiation sources 14a, 14b, 140a, 140b ... detector 15, 150 ... rotating member 50a ... driven around the C axis Unit 50b ... D-axis drive unit 200 ... Image collation device 300 ... Treatment plan selection device 300a ... CPU
300b ... RAM
300c: Bus lines A, E, F ... Irradiation axes C, D, G ... Turning axes U, V ... Swing direction

Claims (10)

A radiation generator for emitting radiation along a radiation axis passing through the isocenter;
A plurality of fluoroscopic radiation generators for emitting radiation along a radiation axis passing through the isocenter;
A plurality of detectors arranged at positions symmetrical to the isocenter corresponding to each of the plurality of fluoroscopic image radiation generating devices;
The position information of the irradiation target in the image at the time of treatment planning is held, and the image information of the detection image near the irradiation target detected by the plurality of detectors is collated with the position information of the irradiation target in the image at the time of treatment planning. An image collating device for determining the irradiation target position in the detection image;
Based on the irradiation target position in the detection image, an analysis device that calculates a relative position between the irradiation target position and the isocenter;
A control device for controlling the radiation generating apparatus to move the center of the irradiation target to the isocenter based on relative position information between the irradiation target position and the isocenter and to emit radiation based on a set treatment plan A radiotherapy apparatus comprising: The radiotherapy apparatus according to claim 1, wherein
The radiotherapy apparatus, wherein the treatment plan is a dynamic tracking treatment plan or a non-tracking treatment plan. The radiotherapy apparatus according to claim 1 or 2,
Furthermore, a radiotherapy apparatus comprising a treatment plan selection apparatus that holds a plurality of treatment plan candidates and selects the treatment plan from among the treatment plan candidates. A treatment plan selection program provided in the radiotherapy device according to any one of claims 1 to 3 for causing the control device to perform radiation emission control based on a treatment plan to be selected. There,
The treatment plan selection device provided in the radiotherapy device has a CPU and a RAM connected to a bus line,
The RAM stores the treatment plan selection program. When a selection instruction is input from the outside to the treatment plan selection device, the CPU reads and reads the treatment plan selection program via the bus line. The treatment plan selection program that causes the CPU to execute the treatment plan selection program and to cause the control device to perform radiation emission control based on a treatment plan to be selected. In advance, a radiation generator, a plurality of fluoroscopic image radiation generators, and a plurality of detectors arranged at positions symmetric with respect to the isocenter corresponding to each of the plurality of fluoroscopic image radiation generators, In a radiotherapy apparatus comprising an image collation device that holds position information of an irradiation target in an image at the time of treatment planning, an analysis device, a control device, and a treatment plan selection device that holds a plurality of treatment plan candidates,
The treatment plan selection device selecting a treatment plan from the treatment plan candidates;
Detecting an image in the vicinity of the irradiation target with the plurality of detectors;
Collating the image information of the detected image with the position information of the irradiation target in the treatment planning image in the image verification device and measuring the position of the irradiation target in the detection image;
Calculating a relative position from the isocenter of the irradiation target in the detection image in the analysis device;
The control device moving an irradiation axis of radiation irradiated from the radiation generating device to the center of the irradiation target based on the relative position information from the isocenter of the irradiation target;
A radiation treatment planning method, comprising: the control device controlling the radiation generating device based on the treatment plan. The radiation therapy planning method according to claim 5,
The radiation treatment planning method, wherein the plurality of treatment plan candidates are a dynamic tracking treatment plan and a non-tracking treatment plan. The radiation therapy planning method according to claim 5 or 6,
The radiotherapy planning method, wherein the treatment planning image is a DRR image, and the detection image is a fluoroscopic image. The radiation therapy planning method according to claim 5 or 6,
The radiotherapy planning method, wherein the treatment planning image is a DRR image, and the detection image is a CT image. The radiation therapy planning method according to claim 5 or 6,
The radiotherapy planning method, wherein the treatment planning image is a DRR image and the detected image is a DRR image. In the radiation treatment planning method according to any one of claims 5 to 9,
A radiotherapy planning method in which the treatment plan selected by the treatment plan selection device is determined based on the state of the irradiation target of the detected image.

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