JP2006174885A - Irradiation plan preparation method of radiotherapy apparatus and irradiation planning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of preparing an irradiation plan of a radiotherapy apparatus for preparing a treatment plan in a short period, and an irradiation planning device. <P>SOLUTION: This invention comprises the method of preparing the irradiation plan of the radiotherapy apparatus and the irradiation planning device capable of checking in advance the physical intervention among the radiotherapy apparatus, a treatment bed and a patient in preparing the irradiation plan and preventing the hand-return caused by the physical intervention while the treatment is performed. This invention also comprises the method of preparing the irradiation plan of the radiotherapy apparatus and the irradiation planning device capable of preparing the treatment plan in a shorter period than before by visually displaying the physical intervention among the radiotherapy apparatus, the treatment bed and the patient and the direction of irradiation other than the irradiation of critical organs of the patient. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an irradiation plan planning method for an irradiation plan to be planned when performing radiation therapy using a radiotherapy apparatus, and an irradiation planning apparatus for planning an irradiation plan.

In radiotherapy, it has been conventionally performed to increase the irradiation accuracy of radiation irradiated to an affected area (cancer lesion) of a patient and to prevent irradiation of normal cell tissues other than 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.

However, in order to irradiate only the affected area with high accuracy, a detailed irradiation plan is devised, such as what angle and how much irradiation dose should be applied to the affected area. There is a need.

For example, in the irradiation plan, the radiation angle and dose of radiation to the affected area are determined, and even if an attempt is made to start irradiation, the affected area viewed from the radiation emitting section of the radiation therapy apparatus at the set angle is the dead angle of the radiation emitting section. In some cases, irradiation cannot be performed, or there is a physical interference between the radiation therapy apparatus and the treatment bed or the patient itself, and the irradiation plan must be redesigned from the beginning. In addition, although there is no physical interference, there is a case where the irradiation from the initially set angle has to be abandoned due to the large irradiation dose to the visceral dangerous organ. When an irradiation plan is re-designed in this way, the time required for treatment increases, the physical and mental burden on the patient increases, and the burden on the treatment staff also increases.

Here, in order to clarify the relative positional relationship between the radiation therapy apparatus, the patient and the treatment bed, and the comprehensive area of each, the schematic configuration and operation principle of the conventional radiation therapy apparatus will be described.

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 (imagers) 13a and 13b.

  The operation of the radiation therapy apparatus 1, the patient P, and the treatment bed 9 when aligning the radiation axis A of the radiation generator 2 with the center of the affected area of the patient P in order to irradiate the affected area of the patient P will be described below. To do.

  Before the 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). Based on a plurality of two-dimensional CT images, a three-dimensional DRR (Digital Reconstructed Radiograph) image of the designated organ and affected part (cancer lesion) is reconstructed. Based on the DRR image, the direction of radiation irradiated to the affected area, the irradiation region, and the radiation dose are determined, and an irradiation plan is created. When the irradiation 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 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 is positioned at 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 (imagers) 13a and 13b along the radiation axes E and F, respectively, and an image of the affected area of the patient P is obtained. Is acquired by the imager detectors 14a and 14b. The acquired images of the imagers 13 a and 13 b are input to the analysis device 7. The analysis device 7 is input with a three-dimensional DRR image that has already been created at the time of treatment planning and has position information on the affected area. From the relative positional relationship between the position of the affected area in the three-dimensional 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 moves and adjusts the position of the treatment bed 9, the turning angle R of the guide 3, and the traveling angle S of the rotating member 15 with respect to the guide 3 in an optimal combination based on the input deviation amount data. As a result, the center of the affected area is moved to the isocenter 10.

However, as described above, even when trying to perform such an operation, the affected part viewed from the radiation emitting part of the radiotherapy apparatus at the set irradiation angle falls within the blind spot of the radiotherapy apparatus and cannot be irradiated. In some cases, the radiotherapy apparatus and the treatment bed or the patient physically interfere with each other, and the irradiation plan must be re-designed from the beginning. In addition, although there is no physical interference, there is a case where the irradiation from the initially set irradiation angle has to be abandoned due to the large dose of the internal organs, and absorption into the dangerous organs. The irradiation angle is reset by repeating trial and error while confirming the dose.

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

  In the “method of creating a stereotactic radiotherapy apparatus treatment plan and treatment plan apparatus” disclosed in Japanese Patent Application Laid-Open No. 5-337208, a single point is determined from multiple directions by combining the gantry for treatment and the rotational movement of the treatment table. In a treatment plan creation method for performing dose planning, treatment condition determination, etc. of a stereotactic radiotherapy apparatus that concentrates on radiation and treats, treatment table diagram, treatment gantry diagram, patient lesion map, and entire patient Proposed a radiation plan creation method for stereotactic radiotherapy equipment that displays the figure on the display screen so that the lesion is in the isocenter and is actually arranged, and the treatment conditions are set and checked from this display screen. Has been.

JP-A-5-337208

  An object of the present invention is to provide an irradiation planning method and an irradiation planning apparatus for a radiation therapy apparatus that can make an irradiation plan in a short period of time.

  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 radiotherapy apparatus (10) of the present invention is a therapeutic bed (90) for placing a patient (P), and a therapeutic radiation toward an affected part of the patient (P) placed on the therapeutic bed (90). An irradiation plan comprising: a gantry for irradiating; and an irradiation planning device (600) for making an irradiation plan for irradiating the affected part of the patient (P) positioned at the isocenter (100). Position information of the treatment bed (90) on which the patient (P) is placed, information on the body contour of the patient (P), shape data of the gantry, and shape data of the treatment bed (90) are input to the apparatus (600). The irradiation planning device (600) calculates the gantry and the treatment bed (from the shape data of the gantry, the shape data of the treatment bed (90), the position information of the treatment bed (90) and the body contour information of the patient (P)). 90) and Person (P) and to calculate the radial axis angle of the radiation emitted from the gantry does not physically interfere.

  Moreover, the irradiation planning apparatus (600) of the present invention is an irradiation planning apparatus (600) for making an irradiation plan for irradiating the affected part of the patient (P) located at the isocenter (100) with radiation. An input unit (500), an irradiation area calculation unit (300) having shape data of a gantry and shape of a treatment bed (90), and a display unit (400), and an input unit (500) The position information of the treatment bed (90) on which the patient (P) is placed and the information on the body contour of the patient (P) are input to the irradiation region calculation unit (300), and the irradiation region calculation unit (300) Gantry, therapeutic bed (90) and patient (P) based on the shape data, the shape data of the therapeutic bed (90), the position information of the therapeutic bed (90) and the body contour information of the patient (P) Is physically dry Calculating the radiation axis angle of the radiation emitted from the gantry does not, the information of the irradiation axis angle is input to the display unit (400), a display unit (400) displays an area indicating the irradiation axis angle.

  The irradiation planning device (600) of the present invention further receives position information of the dangerous organ of the patient (P) from the input unit (500), and the irradiation region calculation unit (300) receives the shape data of the gantry, the treatment Based on the shape data of the bed (90), the position information of the treatment bed (90), the body contour information of the patient (P) and the position information of the patient's dangerous organ, the gantry, the treatment bed (90) and the patient (P ) And the radiation axis angle of the radiation irradiated from the gantry that does not physically interfere with the dangerous organ of the patient (P), and information on the irradiation axis angle is displayed on the display unit (400). The display unit displays the area indicated by the irradiation axis angle.

  In addition, the radiation axis angle of the radiation irradiated from the gantry according to the irradiation planning apparatus (600) of the present invention is the turning angle (R) that is rotatable about the vertical axis and the traveling angle that is rotatable about the horizontal axis. (S).

  The radiation planning method for the radiation therapy apparatus of the present invention is a radiation planning method for the radiation therapy apparatus (10) for irradiating the affected area of the patient (P) with the radiation therapy apparatus (10). The shape data of the gantry that irradiates radiation provided to the patient, the shape data of the treatment bed (90) on which the patient is placed, and the affected part of the patient (P) is the isocenter (100). Of the gantry where the gantry and the treatment bed (90) and the patient (P) do not physically interfere based on the position information of the treatment bed (90) and the body contour information of the patient (P) The step of calculating the irradiation angle and the region indicated by the radiation axis angle of the radiation irradiated from the gantry where the gantry and the treatment bed (90) and the patient (P) do not physically interfere with each other are displayed. That and a step.

  Further, the radiation planning method of the radiotherapy apparatus of the present invention further causes physical interference between the gantry, the therapeutic bed (90) and the patient (P) based on the position information of the dangerous organ of the patient (P). And a step of calculating an irradiation angle of the gantry that does not irradiate the dangerous organ of the patient (P), and a step of displaying a region indicated by the radiation axis angle of the radiation irradiated from the gantry.

  Further, the radiation axis angle of the radiation irradiated from the gantry related to the irradiation planning method of the radiotherapy apparatus of the present invention is rotatable around the vertical angle (R) and the horizontal axis. Traveling angle (S).

  The radiation planning program for the radiation therapy apparatus of the present invention is used in the radiation planning method for the radiation therapy apparatus (10) for irradiating the affected area of the patient (P) and is readable by a computer. Irradiation planning program, which is provided in the radiation therapy apparatus (10) and forms the shape data of the gantry which irradiates radiation, and the shape of the treatment bed (90) which is provided in the radiation therapy apparatus (10) and carries the patient Based on the data, the position information of the treatment bed (90) when the affected part of the patient (P) is aligned with the isocenter (100), and the body contour information of the patient (P), the gantry and the bed for treatment (90) The function of calculating the irradiation angle of the gantry that does not physically interfere with the patient (P), and the gantry, the treatment bed (90), and the patient (P) are physically And a function of displaying an area indicating the radiation axis angle of the radiation emitted from a not-Wataru gantry.

  Further, the radiation planning program for the radiotherapy apparatus of the present invention further causes physical interference between the gantry, the therapeutic bed (90), and the patient (P) based on the position information of the dangerous organ of the patient (P). And a function of calculating the irradiation angle of the gantry that does not irradiate the dangerous organ of the patient (P) and a function of displaying a region indicated by the radiation axis angle of the radiation irradiated from the gantry.

  In addition, the radiation axis angle of the radiation irradiated from the gantry related to the irradiation plan planning program of the radiotherapy apparatus of the present invention is rotatable about the turning angle (R) that is rotatable about the vertical axis and the horizontal axis. Traveling angle (S).

  According to the present invention, it is possible to check in advance physical interference between a radiotherapy apparatus, a treatment bed, and a patient at the time of irradiation planning, and to prevent occurrence of rework due to physical interference at the time of irradiation. An irradiation planning method and an irradiation planning apparatus can be provided. In addition, the treatment plan can be made in a short period of time by visually displaying the physical interference between the radiation therapy device, the treatment bed and the patient, and the area indicating the irradiation angle that does not irradiate the patient's dangerous organ. It is possible to provide an irradiation planning method and an irradiation planning apparatus for a radiotherapy apparatus capable of performing the above.

  With reference to the accompanying drawings, the best mode for carrying out the irradiation planning method and the irradiation planning apparatus of the radiotherapy apparatus according to the present invention will be described below.

(Embodiment 1)
The irradiation planning method and the irradiation planning apparatus of the radiation therapy apparatus according to Embodiment 1 of the present invention can check in advance physical interference between the radiation therapy apparatus, the treatment bed and the patient at the time of irradiation planning, and at the time of irradiation. An irradiation angle region that does not cause physical interference is visually displayed, and an irradiation plan is created in a short period of time.

  FIG. 2 shows an overall configuration of the irradiation planning apparatus 600 according to Embodiment 1 of the present invention and the radiation therapy apparatus 10 to which the irradiation planning apparatus 600 is connected.

  Here, in order to describe the configuration and operation principle of the irradiation planning apparatus 600 according to Embodiment 1 of the present invention, first, the configuration and operation principle of the radiation therapy apparatus 10 to which the irradiation planning apparatus 600 is connected will be described. .

  The radiotherapy apparatus 10 includes a therapeutic bed 90 for laying a patient P, a radiation generation apparatus 20 that radiates therapeutic radiation, and a plurality of radiation sources for obtaining fluoroscopic images for confirming the position of an affected part in the body of the patient P. (Imager) 130a, 130b, analysis device 80 for calculating the relative position of the affected part of the fluoroscopic images acquired by the radiation sources (imagers) 130a, 130b and the isocenter 100, and the current position of the affected part calculated by the analysis device 80 And a control device 80 for aligning the affected part and the radiation axis A of the radiation generating device 20 based on the relative position between the isocenter 100 and the isocenter 100.

  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 radiation axis A of the radiation emitted from the radiation generator 20 is set so as to pass through the isocenter 100. In addition, the affected part of the patient P is also aligned so that the center of the affected part comes to the isocenter 100 when the therapeutic radiation is irradiated.

  The radiation generator 20 that emits therapeutic radiation and a plurality of radiation sources (imagers) 13 a and 13 b for confirming the position of the affected part in the body of the patient P are inscribed in a circle of the guide 30. The rotating member 150 is rotatable about a travel angle S around the rotation axis G (y-axis direction) by 360 degrees. Further, the guide 30 is rotatable around a turning angle R around the z-axis direction. The rotation axis G and the z axis are orthogonal to each other as seen in FIG. 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. A plurality of radiation sources (imagers) 130 a and 130 b are arranged at positions to be targeted with respect to the radiation generation apparatus 20, and the radiation emission axes E and F respectively correspond to the radiation emission axis A of the radiation generation apparatus 20. Similarly, 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 axis A of the radiation generator 20 is finely moved in the V and U directions, and the directing direction of the radiation axis A is movable.

  The isocenter 100 described above is set on the central axis G at the center of the circular frame of the guide 30, and the radiation emission axis A of the radiation generator 20 and the radiation emission axes E and F from the radiation sources (imagers) 130 a and 130 b are as follows. All intersect at one point in the isocenter 100.

  A detector 60 is used to align the radiation axis A of the radiation generator 20. At the time of axial alignment, the detector 60 is arranged at a point-symmetrical position of the radiation generator 20 with respect to the isocenter 100, and fine adjustment of the radiation axis A of the radiation generator 20 is performed. Is evacuated to the side of the therapeutic bed 90. Imager detectors 140a and 140b are used for obtaining fluoroscopic images from the radiation sources (imagers) 130a and 130b and for aligning the radiation emission axes E and F. For alignment of the radiation axes E and F of the radiation sources (imagers) 130a and 130b, the imager detectors 140a and 140b are arranged at point-symmetric positions of the radiation sources (imagers) 130a and 130b with respect to the isocenter 100. Then, the radiation axes E and F of the radiation sources (imagers) 130 a and 130 b are finely adjusted to pass through the isocenter 100. Further, by rotating the rotating member 150 in the traveling angle S direction 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 three-dimensional DRR (Digital Reconstructed Radiograph) image is reconstructed from a plurality of CT images.

  Below, the irradiation plan planning method of the radiotherapy apparatus concerning this Embodiment 1, and the irradiation procedure to the affected part based on this irradiation planning method are demonstrated. FIG. 3A shows the flow of the irradiation plan planning.

  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). A three-dimensional DRR (Digital Reconstructed Radiograph) image of an affected part (cancer lesion) designated based on a plurality of photographed two-dimensional CT images is created. From this DRR image, the position and situation of the affected area of the patient P are diagnosed, the angle of the radiation irradiated to the affected area, the irradiation area, and the radiation dose are determined, and the creation of an irradiation plan is started.

  In this Embodiment 1, the irradiation plan apparatus 600 shown in FIG. 4 is used for this irradiation plan preparation. The irradiation planning apparatus 600 includes an input unit 500, an irradiation area calculation unit 300, and a display unit 400. CPU 300a, INT 300d, INT 300e, INT 300f, RAM 300b, and memory 300g are connected to the irradiation region calculation unit 300 via a bus line 300c. The INT 300 f is connected to the input unit 500, the INT 300 d is connected to the analysis device 70, the INT 300 e is connected to the control device 80, and the memory 300 g is connected to the display unit 400.

  First, the central coordinates (x, z) of the treatment bed 90 when the affected part of the patient P is aligned with the isocenter 100 are input to the input unit 500 (S1). The input x and z information is stored in the RAM 300b via the interface (INT) 300f of the irradiation area calculation unit 300. In addition, information on the body height (h) of the patient P obtained from the CT tomographic image and the three-dimensional DRR image is stored in the RAM 300b from the analysis device 70 via the interface (INT) 300d of the irradiation region calculation unit 300. . However, regarding the information on the body height (h) of the patient P obtained from the CT tomographic image or the three-dimensional DRR image, the information captured by another CT scanner may be input from the input unit 500 (S2). ). The center coordinates (x, z) of the therapeutic bed 90 and the body height (h) of the patient P obtained from the CT tomogram and 3D DRR image are as shown in the schematic diagram of FIG. is there. When the x, z, and h information is stored in the RAM 300b, the irradiation area calculation program stored in the RAM 300b is read by the CPU 300a and the program is executed. The irradiation area calculation program is based on the x, z, and h information stored in the RAM 300b and the treatment bed shape data and radiation treatment device shape data stored in the RAM 300b in advance, and the radiation treatment apparatus 10 and the treatment bed. 90 and an irradiation angle that does not physically interfere with the patient P are calculated (S3), and the calculation result is displayed on the display unit 400 via the memory 300g (S4). In FIG. 6, an area indicating an angle at which the radiotherapy apparatus 10, the treatment bed 90, and the patient P do not physically interfere with each other is displayed in the hatch portion using the traveling angle S and the turning angle R of the radiotherapy apparatus 10 as parameters. Yes. In the first embodiment, the radiation treatment plan is drawn up in an area showing an angle at which the radiation treatment apparatus 10 and the treatment bed 90 and the patient P do not physically interfere with each other. After that, it is prevented that physical interference is confirmed and the irradiation plan must be reset.

  Thus, when an irradiation plan is created in the first embodiment, radiation therapy is performed based on this irradiation plan.

  In the radiation therapy, as shown in FIG. 2, the patient P is laid down 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 obtaining fluoroscopic images is emitted from the radiation sources (imagers) 130a and 130b along the radiation axes E and F, respectively, and an image of the affected area of the patient P is obtained. Are obtained by the imager detectors 140a and 140b. The acquired image information of the imagers 130 a and 130 b is input to the analysis device 70. In the analysis device 70, the position of the affected part in the three-dimensional DRR image at the time of treatment planning is collated with the affected part corresponding part in the fluoroscopic image acquired this time. Then, the position of the affected part of the fluoroscopic image acquired this time is determined, and how much the current affected part is displaced from 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 determines the position of the treatment bed 90, the turning angle R about the z-axis of the guide 30 and the traveling angle S about the turning axis G with respect to the guide 3 of the rotating member 150 based on the input deviation amount data. The center of the affected area is moved to the isocenter 100 by adjusting the movement in an appropriate combination.

  In the first embodiment, when an irradiation angle is set in an area where physical interference between the radiotherapy apparatus, the treatment bed, and the patient is generated by mistake, control is performed from the CPU 300a of the irradiation planning apparatus 600 via the INT 300e. A signal for stopping activation of the radiation therapy apparatus 10 is transmitted to the apparatus 80.

  In the irradiation planning method and the irradiation planning apparatus of the radiation therapy apparatus according to the first embodiment, as described above, physical interference between the radiation therapy apparatus, the treatment bed, and the patient is checked in advance during the irradiation planning. Therefore, it is possible to eliminate rework due to physical interference during irradiation.

(Embodiment 2)
The radiation planning method and the radiation planning apparatus of the radiation therapy apparatus according to Embodiment 2 of the present invention can check physical interference between the radiation therapy apparatus, the treatment bed, and the patient in advance at the time of the radiation planning. The area that shows the irradiation angle that sometimes does not cause physical interference is visually displayed, and the area that shows the irradiation angle that does not cause irradiation to the dangerous organ of the patient is also displayed visually, so that irradiation can be performed in a short period of time. Make a plan.

  The configuration of the irradiation planning apparatus according to the second embodiment of the present invention is the same as that of the first embodiment as shown in FIGS. The basic operation principle of the irradiation planning apparatus is the same as that in the first embodiment.

  Below, the irradiation plan planning method of the radiation therapy apparatus 600 concerning this Embodiment 2, and the irradiation procedure to the affected part based on this irradiation planning method are demonstrated. Further, FIG. 3B shows a flow of planning an irradiation plan.

  In the second embodiment, similarly to the first embodiment, a CT tomographic image in the vicinity of the affected area of the patient P is taken by an X-ray CT scanner (Computed Tomography Scanner) before radiation treatment. A three-dimensional DRR (Digital Reconstructed Radiograph) image of an affected part (cancer lesion) designated based on a plurality of photographed two-dimensional CT images is created. Based on this DRR image, the position and situation of the affected area of the patient P are diagnosed, the irradiation angle, irradiation area and irradiation dose of the radiation irradiated to the affected area are determined, and the creation of an irradiation plan is started.

  In the present embodiment, an irradiation planning apparatus 600 shown in FIG. 4 is used for creating the irradiation plan, as in the first embodiment. The irradiation planning apparatus 600 includes an input unit 500, an irradiation area calculation unit 300, and a display unit 400. CPU 300a, INT 300d, INT 300e, INT 300f, RAM 300b, and memory 300g are connected to the irradiation region calculation unit 300 via a bus line 300c. The INT 300 f is connected to the input unit 500, the INT 300 d is connected to the analysis device 70, the INT 300 e is connected to the control device 80, and the memory 300 g is connected to the display unit 400.

  First, the central coordinates (x, z) of the treatment bed 90 when the affected part of the patient P is aligned with the isocenter 100 are input to the input unit 500 (S10). The input x and z information is stored in the RAM 300b via the interface (INT) 300f of the irradiation area calculation unit 300. Further, information on the body height (h) of the patient P obtained from the CT tomographic image and the three-dimensional DRR image and the position coordinate information of the dangerous organ are sent from the analysis device 70 to the interface (INT) 300d of the irradiation region calculation unit 300. To be stored in the RAM 300b. However, regarding the information on the body height (h) of the patient P and the position coordinate information of the dangerous organ obtained from the CT tomographic image or the three-dimensional DRR image, those captured by other CT scanners are input from the input unit 500. It may be input (S20). The center coordinates (x, z) of the therapeutic bed 90 and the body height (h) of the patient P obtained from the CT tomogram and 3D DRR image are as shown in the schematic diagram of FIG. is there. When the x, z, h information and the position coordinate information of the dangerous organ are input to the RAM 300b, the irradiation area calculation program stored in the RAM 300b is read by the CPU 300a and the program is executed. The irradiation area calculation program is based on the above x, z, h information stored in the RAM 300b, the position coordinate information of the dangerous organ, and the treatment bed shape data and the radiation treatment device shape data stored in the RAM 300b in advance. An irradiation angle at which the radiotherapy apparatus 10, the treatment bed 90, and the patient P do not physically interfere with each other and an irradiation angle that does not irradiate the patient's dangerous organ are calculated (S30), and the calculation result is displayed via the memory 300g. The data is input to the unit 400 and displayed on the display unit 400 (S40). In FIG. 7, an area indicating an angle at which the radiotherapy apparatus 10, the treatment bed 90, and the patient P do not physically interfere with each other is displayed in the hatch portion using the traveling angle S and the turning angle R of the radiotherapy apparatus 10 as parameters. . Moreover, the area | region which shows the angle used as the irradiation to a patient's dangerous organ is displayed by the oblique line part.

  In the radiation planning method and the radiation planning apparatus of the radiation therapy apparatus according to the present embodiment, as described above, physical interference between the radiation therapy apparatus, the treatment bed and the patient, and irradiation of the patient's dangerous organ at the time of the therapy planning. Can be checked in advance, eliminating the occurrence of physical interference and rework due to the discovery of angular regions that cause irradiation of dangerous organs of the patient during irradiation. be able to.

It is a perspective view which shows the conventional radiotherapy apparatus. It is a perspective view which shows the irradiation plan apparatus connected to the radiotherapy apparatus and the radiotherapy apparatus concerning embodiment of this invention. FIG. 3 is a diagram showing a flow of an irradiation plan planning according to the first embodiment. FIG. 10 is a diagram showing a flow of an irradiation plan planning according to the second embodiment. It is a figure which shows the detail of the irradiation plan apparatus concerning embodiment of this invention. It is a schematic diagram which shows the turning angle and traveling angle in the radiotherapy apparatus concerning embodiment of this invention. In the radiotherapy apparatus concerning embodiment of this invention, it is a schematic diagram which shows the area | region of a turning angle and a running angle without a physical interference with a radiotherapy apparatus, a treatment bed, and a patient. In the radiotherapy apparatus according to the embodiment of the present invention, there is no physical interference between the radiotherapy apparatus, the treatment bed, and the patient, and a pattern showing a region of a turning angle and a running angle that does not cause irradiation of the patient's dangerous organ. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 ... Radiation therapy apparatus 2, 20 ... Radiation generation apparatus 3, 30 ... Guide 5, 50 ... Movable member 6, 60 ... Detector 7, 70 ... Analysis apparatus 8, 80 ... Control apparatus 9, 90 ... Treatment bed 10, 100 ... isocenters 13a, 13b, 130a, 130b ... radiation sources (imagers)
14a, 14b, 140a, 140b ... detector 15 for imager, 150 ... rotating member 300 ... irradiation area calculation unit 300a ... CPU
300b ... RAM
300c ... Bus line 300d ... Interface (INT)
300e ... Interface (INT)
300f ... Interface (INT)
300g ... Memory 400 ... Display unit 500 ... Input unit 600 ... Irradiation planning devices A, E, F ... Irradiation axes C, D, G ... Swing axis U, V ... Swing direction R ... Turning angle S ... Running angle

Claims (10)

A therapeutic bed for the patient,
A gantry for irradiating therapeutic radiation toward the affected area of the patient placed on the therapeutic bed;
An irradiation plan device for planning an irradiation plan for irradiating radiation to the affected part of the patient located at the isocenter;
Position information of the treatment bed placed on the patient, information on the body contour of the patient, shape data of the gantry and shape data of the treatment bed are input to the irradiation planning device,
The irradiation planning apparatus is configured such that the gantry, the treatment bed, and the patient are physically determined from the shape data of the gantry, the shape data of the treatment bed, the position information of the treatment bed, and the information of the body outline of the patient. A radiation therapy apparatus for calculating a radiation axis angle of radiation irradiated from the gantry that does not interfere with the gantry. It is provided in the radiotherapy device according to claim 1,
An irradiation planning device for planning an irradiation plan for irradiating radiation to an affected part of a patient located at the isocenter,
An input section;
An irradiation area calculation unit having shape data of the gantry and shape data of the treatment bed;
A display unit,
Position information of the treatment bed on which the patient is placed and information of the patient's body contour are input from the input unit to the irradiation region calculation unit,
The irradiation area calculation unit is configured to determine whether the gantry, the treatment bed, and the patient from the shape data of the gantry, the shape data of the treatment bed, the position information of the treatment bed, and the body contour information of the patient. Calculate the radiation axis angle of the radiation emitted from the gantry that does not physically interfere,
Information on the irradiation axis angle is input to the display unit,
The said display part is an irradiation plan apparatus which displays the area | region which the said irradiation axis angle shows. In the irradiation plan apparatus of Claim 2,
Position information of the patient's dangerous organ is further input from the input unit,
The irradiation area calculation unit is based on shape data of the gantry, shape data of the treatment bed, position information of the treatment bed, information on the body contour of the patient, and position information of the dangerous organ of the patient. The radiation axis angle of the radiation irradiated from the gantry that does not physically interfere with the gantry and the treatment bed and the patient and does not irradiate the dangerous organ of the patient;
Information on the irradiation axis angle is input to the display unit,
The said display part is an irradiation plan apparatus which displays the area | region which the said irradiation axis angle shows. In the irradiation plan apparatus of Claim 2 or 3,
An irradiation planning apparatus in which a radiation axis angle of radiation irradiated from the gantry is a turning angle that is rotatable about a vertical axis and a traveling angle that is rotatable about a horizontal axis. An irradiation plan planning method for a radiotherapy apparatus for planning an irradiation plan in a radiotherapy apparatus for irradiating radiation to an affected part of a patient,
When the shape data of the gantry that is provided in the radiotherapy apparatus and irradiates radiation, the shape data of the treatment bed that is provided in the radiotherapy apparatus and places the patient, and the affected area of the patient are aligned with the isocenter The radiation axis angle of the radiation irradiated from the gantry that does not physically interfere with the gantry, the treatment bed, and the patient is calculated based on the position information of the treatment bed and the body contour information of the patient. Steps,
An irradiation plan planning method for a radiation therapy apparatus comprising: displaying a region indicated by a radiation axis angle of radiation irradiated from the gantry. In the irradiation planning method of the radiotherapy apparatus according to claim 5,
Further, irradiation is performed from the gantry that does not cause physical interference between the gantry, the therapeutic bed and the patient based on positional information of the patient's dangerous organ, and does not irradiate the patient with the dangerous organ. Calculating a radiation axis angle of radiation;
An irradiation plan planning method for a radiation therapy apparatus comprising: displaying a region indicated by a radiation axis angle of radiation irradiated from the gantry. In the irradiation planning method of the radiotherapy apparatus according to claim 5 or 6,
An irradiation plan formulation method for a radiation therapy apparatus, wherein a radiation axis angle of radiation irradiated from the gantry is a turning angle that is rotatable about a vertical axis and a traveling angle that is rotatable about a horizontal axis. An irradiation plan planning program that is used in an irradiation plan planning method of a radiotherapy apparatus for planning an irradiation plan in a radiotherapy apparatus for irradiating radiation to an affected part of a patient, and is readable by a computer,
Shape data of a gantry that is provided in the radiotherapy apparatus and emits radiation; and
Shape data of a treatment bed provided on the radiation treatment apparatus and on which the patient is placed;
The gantry and the treatment bed and the patient do not physically interfere with each other based on the position information of the treatment bed and the body outline information of the patient when the affected part of the patient is aligned with the isocenter. The function of calculating the radiation axis angle of the radiation emitted from
An irradiation plan planning program for a radiation therapy apparatus comprising a function of displaying a region indicated by a radiation axis angle of radiation irradiated from the gantry. In the irradiation plan planning program of the radiotherapy apparatus according to claim 8,
Further, irradiation is performed from the gantry that does not cause physical interference between the gantry, the therapeutic bed and the patient based on positional information of the patient's dangerous organ, and does not irradiate the patient with the dangerous organ. A function to calculate the radiation axis angle of radiation;
An irradiation plan planning program for a radiation therapy apparatus comprising a function of displaying a region indicated by a radiation axis angle of radiation irradiated from the gantry. In the irradiation plan planning program of the radiotherapy apparatus according to claim 8 or 9,
An irradiation plan planning program for a radiation therapy apparatus, wherein a radiation axis angle of radiation irradiated from the gantry is a turning angle that is rotatable about a vertical axis and a traveling angle that is rotatable about a horizontal axis.

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