JP5643560B2 - Radiotherapy system and control method thereof - Google Patents

Description

  The present embodiment as one aspect of the present invention relates to a radiotherapy system capable of performing radiotherapy and a control method thereof.

  In radiotherapy, image data is generated by imaging at the time of treatment planning, and treatment plan data is generated based on the image data. In addition, image data is generated by imaging immediately before treatment. Then, the image data immediately before the treatment and the image data for the treatment plan are aligned, and a deviation of the image data immediately before the treatment from the image data for the treatment plan is calculated. The patient position is shifted and repositioning is performed. After repositioning, the treatment site of the patient is irradiated with radiation, and radiotherapy is performed.

JP 2010-69086 A

  However, according to the conventional technique, since alignment is performed based on the density (CT value, image density, luminance value, etc.) of both image data including a part not related to treatment, organs in both image data Movement and the like are difficult to consider, and the region of interest such as the treatment site may not be accurately aligned. In particular, when irradiating the lung, liver or other thoracic / abdominal organs, there is a risk of irradiating a normal site other than the treatment site because of the respiratory movement of the affected area.

Radiation therapy system of the present embodiment, in order to solve the problems described above, resulting in a mounting means for supporting the patient, imaging means for imaging the subject, imaging of the subject by the imaging unit a first image data which is the pre-imaging of the corresponding between the second image data stored in the obtained storage unit in the imaging of the object, setting each structure region corresponding to structures in the subject Based on the region setting means, the structure region set in the first image data, and the structure region set in the second image data , the treatment organ, radiation, Specific region setting means for setting an organ to which no contact is made, alignment means for executing alignment of the first image data and the second image data based on the specific region, and the aligned first image data Has a deviation calculation means for calculating at least one of the displacement amount and displacement direction from the second image data that has been said alignment.

The method of radiation therapy system of the present embodiment, in order to solve the above problems, a first image data obtained by imaging the subject by the imaging means for imaging the subject, the subject of previous image pickup A structure region corresponding to the structure in the subject corresponding to the second image data obtained by imaging and stored in the storage unit is set, and the structure region set in the first image data And a specific region to be aligned based on the structure region set in the second image data and a treatment organ and an organ to which radiation is not applied, and the first region based on the specific region. 1 run image data and the alignment of the second image data, the first image data that has been said alignment, calculates at least one of the displacement amount and displacement direction from the second image data that has been said alignment Ru is displayed on the display unit.

The external view which shows a part of radiotherapy system of this embodiment. The block diagram which shows the whole radiotherapy system of this embodiment. The block diagram which shows the function of the radiotherapy system of this embodiment. The figure which shows typically an example of the display image based on treatment plan volume data. The figure which shows typically an example of the display image based on volume data just before a treatment. The figure which shows typically an example of the display image based on the volume data just before a treatment after alignment. The figure which shows typically the 1st example of the display of the shift | offset | difference of a comparison point. The figure which shows typically the 2nd example of the display of the shift | offset | difference of a comparison point. The flowchart which shows operation | movement of the radiotherapy system of this embodiment. The flowchart which shows operation | movement of the radiotherapy system of this embodiment.

  A radiotherapy system and a control method thereof according to the present embodiment will be described with reference to the accompanying drawings.

  FIG. 1 is an external view showing a part of the radiation therapy system of the present embodiment. FIG. 2 is a configuration diagram showing the entire radiation therapy system of the present embodiment.

  FIG.1 and FIG.2 shows the radiotherapy system 1 of this embodiment. The radiation therapy system 1 includes a console 10, an imaging device 20, a bed device 30, a treatment planning device 40, and a radiation therapy device (linac: a radiation therapy device that performs treatment by irradiating radiation based on treatment plan data) 50. Is done.

  The imaging device 20, the bed device 30, and the radiation therapy device 50 are usually installed in an examination room as shown in FIG. On the other hand, the console 10 is usually installed in a control room adjacent to the examination room. The treatment planning device 40 is installed outside the examination room and the control room. The treatment planning device 40 may be installed in the control room, or may be a device integrated with the console 10. Typical examples of the imaging apparatus 20 include an X-ray CT apparatus, an MRI (Magnetic Resonance Imaging) apparatus, and an X-ray apparatus. Hereinafter, the case where the X-ray CT apparatus 20a is used as the imaging apparatus 20 will be described.

  As shown in FIG. 2, the console 10 of the radiation therapy system 1 is configured based on a computer, and can communicate with a network such as a hospital backbone LAN (local area network) (not shown). The console 10 is mainly composed of basic hardware such as a CPU (central processing unit) 11, a main memory 12, an image memory 13, an HDD (hard disc drive) 14, an input device 15, and a display device 16. . The CPU 11 is interconnected to each hardware component constituting the console 10 via a bus as a common signal transmission path. Note that the console 10 may include a recording medium drive.

  The CPU 11 is a control device having a configuration of an integrated circuit (LSI) in which an electronic circuit made of a semiconductor is enclosed in a package having a plurality of terminals. When a command is input by operating the input device 15 by an operator such as a doctor, the CPU 11 executes a program stored in the main memory 12. Alternatively, the CPU 11 is a program stored in the HDD 14, a program transferred from the network and installed in the HDD 14, or a program read from a recording medium mounted on a recording medium drive (not shown) and installed in the HDD 14. Are loaded into the main memory 12 and executed.

  The main memory 12 is a storage device having a configuration having elements such as a ROM (read only memory) and a RAM (random access memory). The main memory 12 stores IPL (initial program loading), BIOS (basic input / output system) and data, and is used for temporary storage of the work memory and data of the CPU 11.

  The image memory 13 is a storage device that stores slice data as two-dimensional image data, treatment plan volume data as three-dimensional image data, and volume data just before treatment.

  The HDD 14 is a storage device having a configuration in which a metal disk coated or vapor-deposited with a magnetic material is incorporated in a non-detachable manner. The HDD 14 is a storage device that stores a program (including an OS (operating system) in addition to an application program) installed in the console 10 and data. Also, it is possible to cause the OS to provide a graphical user interface (GUI) capable of performing basic operations by the input device 15 by using graphics frequently for displaying information on the display device 16 for an operator such as an operator. it can.

  The input device 15 is a pointing device that can be operated by an operator, and an input signal according to the operation is sent to the CPU 11.

  The display device 16 includes an image composition circuit (not shown), a video random access memory (VRAM), a display, and the like. The image synthesizing circuit generates synthesized data obtained by synthesizing character data of various parameters with image data. The VRAM develops the composite data as display image data to be displayed on the display. The display is configured by a liquid crystal display, a cathode ray tube (CRT), or the like, and sequentially displays display image data as a display image.

  The console 10 controls the operations of the X-ray CT apparatus 20a, the bed apparatus 30, and the radiation therapy apparatus 50. Further, the console 10 generates projection data by performing logarithmic conversion processing and correction processing (preprocessing) such as sensitivity correction on the raw data input from the DAS 24 of the X-ray CT apparatus 20a, and generates projection data based on the projection data. In addition, slice data as two-dimensional image data and volume data as three-dimensional image data are generated.

  The X-ray CT apparatus 20a of the radiation therapy system 1 images a region including a treatment site in order to display image data of the region including a treatment site such as cancer or tumor of the patient (subject) O. The X-ray CT apparatus 20a includes an X-ray tube 21 as a radiation source, an aperture 22, an X-ray detector 23, a DAS (data acquisition system) 24, a rotating unit 25, a high voltage supply device 26, an aperture driving device 27, and a rotational drive. A device 28 and an imaging controller 29 are provided.

  The X-ray tube 21 generates a braking X-ray by causing an electron beam to collide with a metal target according to the tube voltage supplied from the high voltage supply device 26, and the X-ray is directed toward the X-ray detector 23. Irradiate. Fan beam X-rays and cone beam X-rays are formed by X-rays emitted from the X-ray tube 21.

  The diaphragm 22 adjusts the irradiation range of the X-rays emitted from the X-ray tube 21 by the diaphragm driving device 27. That is, the X-ray irradiation range can be changed by adjusting the aperture of the diaphragm 22 by the diaphragm driving device 27.

  The X-ray detector 23 is a matrix, that is, a two-dimensional array type X-ray detector 23 (also referred to as a multi-slice detector) having a plurality of channels in the channel direction and a plurality of rows in the slice direction. It is. The X-ray detection element of the X-ray detector 23 detects X-rays emitted from the X-ray tube 21.

  The DAS 24 amplifies the transmission data signal detected by each X-ray detection element of the X-ray detector 23 and converts it into a digital signal. Output data from the DAS 24 is supplied to the console 10 via the imaging controller 29.

  The rotating unit 25 integrally holds the X-ray tube 21, the diaphragm 22, the X-ray detector 23, and the DAS 24. The rotating unit 25 can rotate around the patient O together with the X-ray tube 21, the diaphragm 22, the X-ray detector 23, and the DAS 24 with the X-ray tube 21 and the X-ray detector 23 facing each other. It is configured. A direction parallel to the rotation center axis of the rotating unit 25 is defined as a z-axis direction, and a plane orthogonal to the z-axis direction is defined as an x-axis direction and a y-axis direction.

  The high voltage supply device 26 supplies power necessary for X-ray irradiation to the X-ray tube 21 under the control of the imaging controller 29.

  The diaphragm driving device 27 has a mechanism for adjusting the irradiation range of the diaphragm 22 in the X-ray slice direction under the control of the imaging controller 29.

  The rotation driving device 28 has a mechanism for rotating the rotating unit 25 so that the rotating unit 25 rotates around the hollow portion while maintaining the positional relationship under the control of the imaging controller 29.

  The imaging controller 29 includes a CPU and a memory. The imaging controller 29 controls the X-ray tube 21, the X-ray detector 23, the DAS 24, the high voltage supply device 26, the aperture driving device 27, the rotation driving device 28, etc. Run a scan.

  The couch device 30 of the radiation therapy system 1 includes a couchtop 31, a couchtop drive device 32, and a couch controller 39.

  The top plate 31 can place the patient O thereon. The top plate driving device 32 is controlled by the bed controller 39 to move the top plate 31 up and down along the y-axis direction, the mechanism to move the top plate 31 back and forth along the z-axis direction, and the top plate 31. and a mechanism that rotates the y-axis direction as an axis.

  The bed controller 39 includes a CPU and a memory. The couch controller 39 controls the top board driving device 32 and the like, thereby executing a scan with the operation of the X-ray CT apparatus 20a. In addition, the bed controller 39 controls the top board driving device 32 and the like, thereby executing radiation therapy with the operation of the radiation therapy device 50.

  The treatment planning apparatus 40 of the radiation treatment system 1 is a treatment plan for performing radiation treatment by the radiation treatment apparatus 50 based on slice data and volume data that are imaged using the X-ray CT apparatus 20a and generated by the console 10. Generate data. Under the control of the console 10 based on the treatment plan data generated by the treatment planning device 40, the radiation treatment device 50 irradiates the medical site of the patient O with radiation. The treatment planning apparatus 40 is configured on the basis of a computer, and can communicate with a network such as a hospital backbone LAN (not shown). The treatment planning device 40 is mainly composed of basic hardware such as a CPU 41, a main memory 42, a treatment plan memory 43, an HDD 44, an input device 45, and a display device 46. The CPU 41 is interconnected to each hardware component constituting the treatment planning apparatus 40 via a bus as a common signal transmission path. The treatment planning device 40 may include a recording medium drive.

  The configuration of the CPU 41 is equivalent to the configuration of the CPU 11 of the console 10. When an instruction is input by operating the input device 45 by an operator, the CPU 41 executes a program stored in the main memory 42. Alternatively, the CPU 41 may be a program stored in the HDD 44, a program transferred from the network and installed in the HDD 44, or a program read from a recording medium installed in a recording medium drive (not shown) and installed in the HDD 44. Are loaded into the main memory 42 and executed.

  The configuration of the main memory 42 is the same as the configuration of the main memory 12 of the console 10. The main memory 42 stores IPL, BIOS, and data, and is used for temporary storage of the work memory and data of the CPU 41.

The treatment plan memory 43 is a storage device that stores treatment plan data.
The configuration of the HDD 44 is the same as the configuration of the HDD 14 of the console 10.
The input device 45 is equivalent to the configuration of the input device 15 of the console 10.
The display device 46 is equivalent to the configuration of the display device 16 of the console 10.

  The treatment planning device 40 obtains the position of the treatment site and the shape of the treatment site of the patient O based on the image data generated by the X-ray CT apparatus 20a, and the radiation (X-ray, electron beam, Neutron beam, proton beam, heavy particle beam, etc.), its energy, and irradiation field.

  The radiotherapy apparatus 50 of the radiotherapy system 1 can generally generate MV class radiation. The radiation therapy apparatus 50 installs a diaphragm (collimator) at a radiation generation port, and realizes an irradiation shape and a dose distribution based on the treatment plan by the diaphragm. In recent years, a multi-leaf collimator (MLC) that can form a dose distribution corresponding to a complicated tumor shape by a plurality of movable leaves as a diaphragm is often used. The radiation therapy apparatus 50 adjusts the radiation dose by the irradiation field formed by the diaphragm, and eliminates or reduces the treatment site of the patient O.

  The radiation therapy apparatus 50 includes a radiation source 51 as a radiation source, an aperture 52, an arm unit 55, a high voltage supply device 56, an aperture drive device 57, a rotation drive device 58, and a treatment controller 59.

  The radiation source 51 generates radiation according to the tube voltage supplied from the high voltage supply device 56.

  The diaphragm 52 adjusts the irradiation range of the radiation irradiated from the radiation source 51 by the diaphragm driving device 57. That is, by adjusting the aperture of the diaphragm 52 by the diaphragm driving device 57, the radiation irradiation range can be changed.

  The arm unit 55 holds the radiation source 51 and the diaphragm 52 together. The arm portion 55 is configured so that the radiation source 51 and the diaphragm 52 can be rotated around the patient O as a unit.

  The high voltage supply device 56 supplies the radiation source 51 with electric power necessary for irradiation with radiation under the control of the treatment controller 59.

  The diaphragm driving device 57 has a mechanism for adjusting the radiation range of the diaphragm 52 under the control of the treatment controller 59.

  The rotation driving device 58 has a mechanism for rotating the arm portion 55 so as to rotate around the connection portion between the arm portion 55 and the support portion under the control of the treatment controller 59.

  The treatment controller 59 includes a CPU and a memory. The treatment controller 59 controls the radiation source 51, the high voltage supply device 56, the diaphragm drive device 57, and the like according to the treatment plan data generated by the treatment planning device 40, thereby performing treatment with the operation of the bed device 30. Radiation is executed.

  FIG. 3 is a block diagram showing functions of the radiation therapy system 1 of the present embodiment.

  As the CPU 11 of the console 10 and the CPU 41 of the treatment planning apparatus 40 execute the program, the radiotherapy system 1 includes an imaging execution unit 61, an image data generation unit 62, a treatment plan data generation unit 63, as shown in FIG. It functions as an interface unit 64, contour setting unit 65, interface unit 66, comparison point (reference point) setting unit 67, specific contour setting unit 68, alignment unit 69, deviation calculation unit 70, and treatment execution unit 71. Note that all or part of the components 61 to 71 of the radiotherapy system 1 may be provided as hardware in the radiotherapy system 1.

  The imaging execution unit 61 of the console 10 controls the operation of the imaging controller 29 of the X-ray CT apparatus 20a and the bed controller 39 of the bed apparatus 30 to image a region including the treatment site of the patient O for a treatment plan. Has a function to be executed. Further, the imaging execution unit 61 controls the operations of the imaging controller 29 of the X-ray CT apparatus 20a and the bed controller 39 of the bed apparatus 30 to execute the imaging of the region including the treatment site of the patient O immediately before the treatment. It has a function.

  The image data generation unit 62 of the console 10 has a function of generating slice data as two-dimensional image data by performing processing such as image reconstruction processing on transmission data acquired by the X-ray CT apparatus 20a by the imaging execution unit 61. . The image data generation unit 62 has a function of generating volume data as three-dimensional image data based on slice data corresponding to a plurality of slices. Specifically, the image data generation unit 62 generates slice data by imaging for treatment planning, and generates volume data (treatment plan volume data) VP for treatment planning by the treatment planning apparatus 40. On the other hand, the image data generation unit 62 generates slice data by imaging immediately before treatment by the radiation therapy apparatus 50, and generates volume data (Q data immediately before treatment) VQ immediately before treatment. The volume data VP and VQ generated by the image data generation unit 62 are respectively stored in a storage device such as the image memory 13.

  The treatment plan data generation unit 63 of the treatment plan apparatus 40 has a function of generating treatment plan data based on the treatment plan volume data VP stored in the image memory 13. When generating the treatment plan data, the treatment plan data generation unit 63 sets a structure region corresponding to the structure in the patient O as the contour SP based on the treatment plan volume data VP, and also compares the points (isocenter). Set RP. The structures in the patient O include a PTV (planning target volume) as a treatment site, an OAR (organ at risk) and other organs that do not wish to receive radiation, bones, and the like. For example, the treatment plan data generation unit 63 sets the contour SP and the comparison point RP via the interface unit 64. The contour SP and the comparison point RP set by the treatment plan data generation unit 63 are three-dimensional information. When setting the contour SP, the treatment plan data generation unit 63 may set only one contour SP1, or may set a plurality of contours SP1, SP2,.

  In addition, although the treatment plan data generation part 63 demonstrates as what produces | generates treatment plan data based on the treatment plan volume data VP produced | generated by the X-ray CT apparatus 20a which comprises the radiotherapy system 1, it is limited to that case Is not to be done. The treatment plan data generation unit 63 may generate treatment plan data based on treatment plan volume data generated by an imaging device external to the radiation treatment system 1. The treatment plan data generated by the treatment plan data generation unit 63 is stored in a storage device such as the treatment plan memory 43.

  The interface unit 64 of the treatment planning device 40 displays a display image based on the treatment plan volume data VP on the display device 46, and selects the contour SP and the comparison point RP on the display image via the input device 45 operated by the operator. It is an interface such as a GUI that makes it possible to do this.

  The contour setting unit 65 of the console 10 has a function of setting a contour SQ corresponding to the contour SP stored in the treatment plan memory 43 based on the volume data VQ immediately before treatment stored in the image memory 13. For example, the contour setting unit 65 sets the contour SQ via the interface unit 66. When setting the contour SQ, the contour setting unit 65 sets only one contour SQ (SQ1) when only one contour SP (SP1) is set, and a plurality of contours SP (SP1, SP2,...) When set, a plurality of contours SQ (SQ1, SQ2,...) Are set.

  The interface unit 66 of the console 10 displays a display image based on the pre-treatment volume data VQ stored in the image memory 13 on the display device 16, and displays the contour SQ on the display image via the input device 15 operated by the operator. It is an interface such as a GUI that enables selection.

  The comparison point setting unit 67 of the console 10 has a function of setting the comparison point RQ based on the pre-treatment volume data VQ stored in the image memory 13. For example, the comparison point setting unit 67 sets the comparison point RQ via the interface unit 66. The interface unit 66 displays a display image based on the pre-treatment volume data VQ stored in the image memory 13 on the display device 16, and selects the comparison point RQ on the display image via the input device 15 operated by the operator. It is an interface such as a GUI that makes it possible.

  The specific contour setting unit 68 of the console 10 includes the contour SP (one contour SP1, or a plurality of contours SP1, SP2,...) Stored in the treatment plan memory 43 and the contour SQ ( Based on one contour SQ1 or a plurality of contours SQ1, SQ2,...), A specific region to be aligned is set as a specific contour s. Examples of the specific contour s include the contours of PTV and OAR. When a plurality of contours SP and a plurality of contours SQ corresponding thereto are set, the specific contour setting unit 68 selects one or more corresponding ones from the plurality of contours SP and the plurality of contours SQ. The contour s can also be set.

  For example, the specific contour setting unit 68 sets the specific contour s via the interface unit 70. The interface unit 66 displays display images based on the volume data VP and VQ including the contours SP and SQ on the display device 16, respectively, and selects the specific contour s on the display image via the input device 15 operated by the operator. It is an interface such as a GUI that makes it possible. Further, for example, when the console 10 registers an identifier such as PTV in advance, the specific contour setting unit 68 can also set the specific contour s corresponding to the registered identifier.

  Further, when setting the specific contour s, the specific contour setting unit 68 may set only one specific contour s (s1), or may set a plurality of specific contours sn (s1, s2,...). Also good. When the specific contour setting unit 68 sets a plurality of specific contours sn, it is desirable to give priority to alignment to the plurality of specific contours sn.

  FIG. 4 is a diagram schematically illustrating an example of a display image based on the treatment plan volume data VP. FIG. 5 is a diagram schematically illustrating an example of a display image based on the volume data VQ immediately before treatment.

  FIG. 4 shows the PTV as the specific contour s1 and the OAR as the specific contour s2 among the plurality of contours SP included in the display image based on the treatment plan volume data VP. FIG. 5 shows the PTV as the specific contour s1 and the OAR as the specific contour s2 among the plurality of contours SQ included in the display image based on the volume data VQ immediately before treatment. Comparing the display image shown in FIG. 4 with the display image shown in FIG. 5, it can be seen that there is a shift between the volume data VP and VQ. 4 and 5, the specific contour setting unit 68 sets two specific contours c1 and c2 based on the contour SP of the treatment plan volume data VP and the contour SQ of the volume data VQ immediately before treatment.

  The alignment unit 69 of the console 10 shown in FIG. 3 is based on the specific contour s included in the treatment plan volume data VP set by the specific contour setting unit 68 and the specific contour s included in the volume data VQ immediately before treatment. In addition, the volume data VP, VQ has a function of performing relative alignment. The alignment method by the alignment unit 69 may be a method of aligning the entire volume data VP, VQ so that the difference in CT values (image density, luminance value, etc.) within the specific contour s is reduced, A method of aligning the entire volume data VP, VQ with a so-called “non-rigid body” corresponding to the deformation / movement of the specific contour s may be used.

  4 and 5, when the PTV as the specific contour s1 has a higher priority than the OAR as the specific contour s2, the specific alignment unit 69 determines the PTV of the treatment plan volume data VP and Based on the PTV of the volume data VQ immediately before treatment, the volume data VP and VQ as a whole are aligned relative to each other. An example of a display image based on the volume data VQ immediately before treatment after alignment is schematically shown in FIG.

  The shift calculation unit 70 of the console 10 shifts the comparison point RQ included in the pre-treatment volume data VQ aligned by the alignment unit 69 from the comparison point RP included in the aligned treatment plan volume data VP ( It has a function of calculating d) at least one of the shift amount and the shift direction of the three-dimensional coordinate system. The deviation d calculated by the deviation calculating unit 70 is displayed on the display device 16 via the interface unit 66.

  FIG. 7 is a diagram schematically illustrating a first example of display of the shift d of the comparison point RQ. FIG. 8 is a diagram schematically illustrating a second example of display of the shift d of the comparison point RQ.

  FIG. 7 shows a case where both the shift amount and the shift direction as the shift d of the comparison point RQ are displayed in a three-dimensional coordinate system. FIG. 8 shows a case where both the shift amount and the shift direction as the shift d of the comparison point RQ are displayed in a two-dimensional coordinate system. By displaying the comparison points RP and RQ as shown in FIGS. 7 and 8, the operator can visually recognize the deviation d of the comparison point RQ.

  After the treatment plan is reconsidered by the treatment planning device 40 on the basis of the display of the deviation d of the comparison point RQ, or after the patient O on the top 31 is shifted by the amount of the deviation d, the resetting is performed. The treatment execution unit 71 of the console 10 has a function of controlling the operation of the treatment controller 59 of the radiation treatment apparatus 50 and the bed controller 39 of the bed apparatus 30 to execute the treatment of the treatment site of the patient O.

  Next, the operation of the radiation therapy system 1 of the present embodiment will be described using the flowcharts shown in FIGS. 9 and 10.

  When the patient O is placed on the couch 31 of the couch device 30 of the radiotherapy system 1, the radiotherapy system 1 controls the operation of the couch controller 39 of the couch device 30 so that the couchtop 31 is moved to the X-ray CT apparatus 20a. Insert into the opening. Next, as shown in FIG. 9, the radiotherapy system 1 controls the operation of the imaging controller 29 of the X-ray CT apparatus 20a, and executes imaging of a region including the treatment site of the patient O for treatment planning (see FIG. 9). Step ST1). Next, the radiotherapy system 1 performs processing such as image reconstruction processing on the transmission data acquired by the X-ray CT apparatus 20a in step ST1 to generate slice data as two-dimensional image data, and slices corresponding to a plurality of slices. Based on the data, treatment plan volume data VP as three-dimensional image data is generated (step ST2). The treatment plan volume data VP generated in step ST2 is stored in a storage device such as the image memory 13 (step ST3).

  The radiation treatment system 1 generates treatment plan data based on the treatment plan volume data VP stored in the image memory 13 in step ST3 (step ST4). In step ST4, the radiation therapy system 1 sets the contour SP of the structure image corresponding to the structure in the patient O (step ST4a). In step ST4, the radiation therapy system 1 sets a comparison point RP based on the treatment plan volume data VP stored in the image memory 13 in step ST3 (step ST4b). The treatment plan data generated in step ST4 is stored in a storage device such as the treatment plan memory 43 (step ST5).

  When the imaging of the region including the treatment site of the patient O is completed in step ST1, the radiotherapy system 1 controls the operation of the bed controller 39 of the bed apparatus 30 to remove the top 31 from the opening of the X-ray CT apparatus 20a. Evacuate. Next, the patient O is lowered from the top plate 31 of the bed apparatus 30 of the radiation therapy system 1.

  When the patient O is placed on the top plate 31 of the bed apparatus 30 of the radiation therapy system 1 immediately before the treatment by the radiation therapy apparatus 50 is performed, the radiation therapy system 1 performs the operation of the bed controller 39 of the bed apparatus 30. Under control, the top plate 31 is inserted into the opening of the X-ray CT apparatus 20a. Next, as shown in FIG. 10, the radiotherapy system 1 controls the operation of the imaging controller 29 of the X-ray CT apparatus 20a, and executes imaging of a region including the treatment site of the patient O immediately before the treatment (step). ST11). Next, the radiotherapy system 1 performs processing such as image reconstruction processing on the transmission data acquired by the X-ray CT apparatus 20a in step ST11 to generate slice data as two-dimensional image data, and slices corresponding to a plurality of slices Based on the data, volume data VQ immediately before treatment as three-dimensional image data is generated (step ST12). The pre-treatment volume data VQ generated in step ST12 is stored in a storage device such as the image memory 13 (step ST13).

  The radiation therapy system 1 sets the contour SQ corresponding to the contour SP stored in the treatment plan memory 43 based on the volume data VQ immediately before treatment stored in the image memory 13 in step ST13 (step ST14). Further, the radiation therapy system 1 sets the comparison point RQ based on the immediately preceding treatment volume data VQ stored in the image memory 13 in step ST13 (step ST15).

  Next, the radiation therapy system 1 sets a specific contour s to be aligned based on the contour SP set in step ST4a in FIG. 9 and the contour SQ set in step ST14 (step ST16). . Examples of the specific contour s include the contours of PTV and OAR.

  Next, the radiotherapy system 1 sets the entire volume data VP and VQ based on the specific contour s included in the treatment plan volume data VP and the specific contour s included in the volume data VQ immediately before the treatment set in step ST16. Are aligned relative to each other (step ST17).

  Next, the radiation therapy system 1 calculates the deviation d of the comparison point RQ included in the pre-treatment volume data VQ aligned in step ST17 from the comparison point RP included in the treatment plan volume data VP (step ST18). . The deviation d calculated in step ST18 is displayed via the display device 16 as shown in FIGS. 7 and 8 (step ST19).

  Next, after the treatment plan is reconsidered by the treatment planning device 40 based on the deviation d displayed in step ST19, or after the patient O on the top 31 is shifted by the deviation d, the resetting is performed. The radiotherapy system 1 controls the operation of the treatment controller 59 of the radiotherapy apparatus 50 to execute the treatment of the treatment site of the patient O (step ST20).

  When the treatment of the treatment site of the patient O is completed in step ST <b> 20, the radiotherapy system 1 controls the operation of the couch controller 39 of the couch device 30 to retract the top board 31 from the radiotherapy device 50. Next, the patient O is lowered from the top plate 31 of the bed apparatus 30 of the radiation therapy system 1.

  According to the radiotherapy apparatus 1 and the control method thereof according to the present embodiment, the treatment plan volume data VP and the immediately preceding treatment volume data VQ are positioned based on the specific contour c that is included in the volume data VP and VQ in common. Therefore, both volume data VP and VQ can be accurately aligned, and treatment according to the treatment plan can be supported.

  In addition, the radiotherapy apparatus 1 of this embodiment was described in order to make an understanding of this invention easy, and was not described in order to limit this invention. Therefore, each element disclosed in the radiotherapy apparatus 1 of the present embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Radiotherapy system 10 Console 20 Imaging device 20a X-ray CT apparatus 29 Imaging controller 30 Bed apparatus 31 Top plate 39 Bed controller 40 Treatment planning apparatus 50 Radiation therapy apparatus 59 Treatment controller 61 Imaging execution part 62 Image data generation part 63 Treatment plan data Generation unit 64 Interface unit 65 Contour setting unit 66 Interface unit 67 Comparison point setting unit 68 Specific contour setting unit 69 Position adjustment unit 70 Deviation calculation unit 71 Treatment execution unit

Claims (7)

A mounting means for mounting a subject;
Imaging means for imaging the subject;
Wherein the first image data obtained by imaging the subject by the imaging means, the imaging prior to said corresponding at the second picture data stored in the obtained storage unit in the imaging of the object, in the subject Area setting means for setting each structure area corresponding to a structure;
Based on the structure region set in the first image data and the structure region set in the second image data, as a specific region to be aligned , a treatment organ and an organ to which radiation is not applied Specific area setting means to be set;
Alignment means for performing alignment of the first image data and the second image data based on the specific region;
Shift arithmetic means for calculating at least one of the shift amount and shift direction of the aligned first image data from the aligned second image data;
A radiation therapy system comprising: A comparison point setting means for setting a comparison point for each of the first image data and the second image data;
The deviation calculating means calculates the deviation amount and the deviation way direction from comparison point in which said set comparison point in aligned first image data, which is set to the second image data that has been said alignment and radiation therapy system according to claim 1, characterized in Rukoto move the position of the placement means in accordance with the shift amount and the shift direction. When the imaging apparatus is an X-ray CT apparatus,
3. The radiation according to claim 1, wherein the alignment unit aligns the first image data and the entire second image data so that a difference in CT values in the specific region is reduced. Treatment system. Radiotherapy system as claimed in any one of claims 1 to 3, characterized in that said image data, a three-dimensional image data. The specific area setting means, when setting a plurality as the specific area, to give a priority for alignment,
The radiotherapy system according to any one of claims 1 to 4 , wherein the alignment unit executes alignment of the first image data and the second image data in accordance with the priority order. . Corresponding with the first image data obtained by imaging the subject by the imaging means for imaging the subject, the second image data that has been obtained stored in the storage unit in the imaging of the subject prior to the imaging, the Set the structure area corresponding to the structure in the subject,
Based on the structure region set in the first image data and the structure region set in the second image data, as a specific region to be aligned , a treatment organ, an organ not irradiated with radiation, Set
Aligning the first image data and the second image data based on the specific area,
Said aligned first image data, Ru is displayed on the display unit calculates at least one of the displacement amount and displacement direction from the second image data that has been said alignment,
A method for controlling a radiation therapy system. A comparison point is set for each of the first image data and the second image data, and the comparison point set for the aligned second image data is compared with the comparison point set for the aligned first image data. The method of controlling a radiotherapy system according to claim 6 , wherein at least one of the shift amount and the shift direction from a point is calculated.