JP5274526B2 - Skin dose display device and skin dose display method - Google Patents

Description

  The present invention relates to a radiotherapy apparatus and a particle beam therapy apparatus for cancer treatment, and more particularly to an apparatus for displaying a radiation exposure dose.

  In the case of radiotherapy in which a patient's treatment affected area is irradiated with a radiotherapy apparatus such as an X-ray therapy apparatus, the normal tissue around the treatment affected area is affected over a wide range, and there are considerable side effects on the outermost skin. Measures to minimize side effects on the skin are desired. On the other hand, particle beam therapy is a treatment method with fewer side effects on the skin compared to an X-ray therapy apparatus or the like because it can irradiate a radiation dose intensively to a treatment affected area. However, when the affected area is close to the skin, the skin is also irradiated with a high dose, which may cause side effects. Since particle beam therapy is expected by patients as a treatment method with few side effects on the skin, even in such a case, a countermeasure for minimizing the side effects on the skin is desired.

  Conventionally, dose data is managed by the treatment planning device installed in the treatment planning room, and the control information of the treatment device based on the dose value calculation is deployed to the treatment room, but the dose value itself is deployed to the treatment room. There was nothing to do. For this reason, it is impossible to confirm the skin dose received by the patient in the treatment room, and if necessary, it is necessary to move to the treatment planning room where the treatment planning apparatus is installed and refer to the treatment planning apparatus.

  Even when checking in the treatment planning room, the dose data display of the treatment planning device is created for the purpose of treatment planning, so it is mainly a two-dimensional display for CT slice images, and the skin dose value is high. It was difficult to accurately confirm the positional relationship between the dosed spot and the patient's body surface. For this reason, even when side effects on the skin are assumed, it is difficult to carry out appropriate treatments or prior treatments before treatment in the treatment room to minimize the side effects immediately after treatment.

  In order to appropriately carry out the treatment immediately after the treatment or the corresponding treatment before the treatment in the treatment room, it is necessary to first calculate the skin dose value and visualize the portion where the dose is high. Patent Document 1 describes a method for calculating an expected dose value and displaying the result so that a patient or medical staff does not receive an exposure dose exceeding an allowable value for an X-ray diagnostic apparatus. ing. In addition, it has been proposed to display a patient model as an exposure dose display target.

Japanese Patent Laid-Open No. 2004-65815 (FIGS. 1 and 9)

  This prior art is intended for an X-ray diagnostic apparatus, and it is the greatest point of interest to estimate whether or not the exposure dose exceeds an allowable value or the numerical value of the exposure dose. Therefore, although a patient model is used as a display target, the problem is solved by using an approximate positional relationship between a standard patient model and a bed.

However, in order to appropriately carry out the treatment immediately after the treatment and the corresponding treatment before the treatment in the treatment room, the positional relationship between the dose data planned in the treatment planning apparatus and the patient body surface in advance, Although it is necessary to display the positional relationship accurately to such an extent that the medical staff can perform an appropriate treatment, the conventional technique has a problem that such accurate positional relationship display cannot be realized.

  An object of the present invention is to display the positional relationship between the skin dose information calculated in the treatment plan and the patient body surface with high accuracy on a patient model displayed on a display device visible in the treatment room.

  A skin dose display device that displays patient skin dose information calculated in a treatment plan for radiation therapy on a display device installed in a treatment room so as to be visible. A patient 3D model generation unit that generates an associated patient 3D model, and a skin dose display processing unit that displays skin dose information superimposed on the patient 3D model on a display device.

  The skin dose display device according to the present invention displays the skin dose information calculated in the treatment plan in a superimposed manner on the patient 3D model having the coordinate system associated with the coordinate system of the CT image used for the treatment plan, and thus calculated in the treatment plan. The positional relationship between the measured skin dose information and the patient body surface can be displayed with high accuracy on a patient model displayed on a display device visible in the treatment room.

It is a block diagram of the skin dose display apparatus of this invention. It is a screen image figure of the display apparatus by Embodiment 1 of this invention. It is a figure explaining the patient 3D model imaging | photography part of FIG. It is a front view explaining the imaging | photography method of the patient 3D model imaging | photography part of FIG. It is a top view explaining the imaging | photography method of the patient 3D model imaging | photography part of FIG. It is a figure explaining the operation | movement of the skin dose display apparatus of this invention, and the process using this apparatus. It is a figure explaining other operation | movement of the skin dose display apparatus of this invention, and the process using this apparatus. It is a screen image figure of the display apparatus by Embodiment 2 of this invention. It is a screen image figure of the display apparatus by Embodiment 3 of this invention. It is a screen image figure of the display apparatus by Embodiment 4 of this invention. It is a figure which shows the example of a display of the skin dose value by Embodiment 5 of this invention. It is a figure which shows the patient 3D model and display example by Embodiment 6 of this invention.

Embodiment 1 FIG.
FIG. 1 is a block diagram of a skin dose display device of the present invention. The skin dose display device 1 includes a skin dose display processing unit 2, a patient 3D model database 3, a patient 3D model imaging unit (patient 3D model generation unit) 4, and a display device 5. The skin dose display processing unit 2 is composed of a computer and software, and performs an isodose curve display process of skin dose values. The patient 3D model database 3 stores a patient 3D model (3D model) obtained by modeling a patient in a three-dimensional display. The patient 3D model imaging unit 4 has a function of imaging the patient 3D model, and stores the patient 3D model in the patient 3D model database 3 after imaging of the patient and creation of the patient 3D model. The display device 5 is installed in, for example, a treatment room, and displays information processed by the skin dose display processing unit 2. The treatment planning apparatus 11 makes several treatment plans such as irradiation conditions based on the three-dimensional data of the affected part that is the irradiation target, and simulates the particle beam treatment. The dose database 12 stores dose values for each treatment plan planned by the treatment planning apparatus 11.

  FIG. 2 is a screen image diagram of the display device according to Embodiment 1 of the present invention. The screen 21 of the display device 5 includes a dose display unit 26, a patient information display unit 25, and a relationship explanation display unit 24. The dose display unit 26 considers the treatment position for each patient, and creates a patient 3D model 22 reflecting the treatment position and an isodose curve of skin dose values as skin dose information on the patient 3D model 22. 23 is superimposed and displayed. The patient information display unit 25 displays patient information such as a patient ID and a name for the patient 3D model 22 being displayed. The relationship explanation display unit 24 displays a description relating the isodose curve 23 and the dose value.

  FIG. 3 is a diagram illustrating a patient 3D model imaging unit of the skin dose display device. The patient 3D model imaging unit 4 captures an optical image of the patient 34 fixed to the CT bed 35 in the CT room using an optical stereo camera (optical camera) 33. The CT origin 32 is the center of the CT gantry 31. The CT image origin 36 is a point where the patient 34 enters the CT gantry 31 and becomes the CT image origin at the time of CT imaging. The model reference coordinate point 37 is a reference coordinate point of the imaging region 38 imaged by the optical stereo camera 33 and is a reference point of the imaged patient 3D model 22.

  The optical stereo camera 33 performs calibration according to the coordinate system of the CT apparatus (CT gantry 31). The variable distance L1 represents the difference between the CT origin 32 and the CT image origin 36. The fixed distance L0 represents the difference between the CT origin 32 and the model reference coordinate point 37. The variable distance L2 represents the difference between the CT image origin 36 and the model reference coordinate point 37. Here, the coordinates of the CT origin 32, the CT image origin 36, and the model reference coordinate point 37 are the same for the X coordinate and the Z coordinate, and only the Y coordinate is different.

  FIG. 4 is a front view for explaining a photographing method of the patient 3D model photographing unit, and FIG. 5 is a top view for explaining a photographing method of the patient 3D model photographing unit. In the optical stereo camera 33, two lenses are incorporated in one housing, and the two lenses are in a predetermined fixed distance, so that the three-dimensional measurement of the object to be photographed is possible by the principle of triangulation. It will be. Since a single camera has many blind spots, a configuration in which two optical stereo cameras 33a and 33b (four lenses) are used to photograph from the left and right upper sides of the patient 34 fixed to the CT bed 35 is suitable. . Thereby, blind spots can be reduced and sufficient images can be taken. In order to secure the field of view of the optical stereo camera 33, the distance between the optical stereo camera 33 and the patient 34 is about 2 m. As a result, a range of about 1000 mm (height direction of patient, Y direction) can be photographed. An angle θ between the CT bed normal 60 and the camera normal 61a of the optical stereo camera 33a and an angle θ between the CT bed normal 60 and the camera normal 61b of the optical stereo camera 33b are about 35 degrees. A random dot pattern is projected onto the object to be photographed in order to increase the photographing accuracy. It is appropriate to use visible light or infrared light as the light source. In the case of a patient who feels dazzling with visible light, taking an infrared image is an effective option.

  FIG. 6 is a diagram for explaining the operation of the skin dose display device and the processing using this device. Step S001 is a patient 3D model creation operation by the patient 3D model photographing unit 4, and includes steps S002 to S006. Step S011 is a treatment plan creation and a dose value calculation operation by the treatment plan apparatus 11, and includes steps S012 to S014. Step S021 is an operation of referring to the skin dose display device 1 at the time of irradiation and performing an appropriate post-irradiation treatment (corresponding treatment), and includes steps S022 to S026. The operation will be described below.

Before performing the radiotherapy apparatus or particle beam therapy treatment planning operation step S011, a CT image used for the therapy planning is taken. At the time of imaging of this CT image, the patient 3D model imaging unit 4 images the patient and creates a patient 3D model 22 for each patient in consideration of the therapeutic position. The procedure is as follows. After the treatment planning CT imaging, the patient 34 is moved to the imaging range of the optical stereo camera 33 in a state where the patient 34 is placed on the CT bed 35 (step S002). Since it is assumed that the treatment isocenter that will bring the treatment radiation source device closer to each other at the time of treatment is near the CT image origin 36, the position that becomes the CT image origin 36 is moved to the vicinity of the center of the imaging range of the optical stereo camera. Since the position that becomes the CT image origin 36 differs for each patient, the moving distance at this time is the variable distance L1.

  Next, the patient 34 on the CT bed 35 is photographed using the optical stereo camera 33 (step S003). Photographing is performed by the photographing method shown in FIGS. The CT bed movement amount of the CT bed 35 and the patient direction of the patient 34, which are information at the time of imaging, are input as attribute information of the captured image (step S004).

  A patient 3D model is generated with the reference coordinate point 37 of the imaging region 38 captured by the optical stereo camera 33 as the initial origin (step S005). Here, the fixed distance L0 is a fixed distance depending on the installation relationship between the optical stereo camera 33 and the CT gantry 31, and the variable distance L1 can be measured by the CT apparatus when the CT bed 35 is moved. Therefore, the variable distance L2 is L0−. L1 can be calculated. By performing the process of moving the origin position by the variable distance L2 from the initial origin 37 of the patient model, the patient 3D model 22 having the CT image origin 36 as the origin can be obtained. Note that the patient direction is also stored as an imaging attribute when the patient 3D model is stored. The skin dose display function of the skin dose display processing unit 2 needs to accurately superimpose the skin dose value calculated by the treatment planning device 11 on the patient 3D model 22. The coordinate calculation in the treatment planning apparatus 11 is based on the coordinate system of the CT image. Since the patient 3D model 22 can have the CT image origin information by the method described above, the patient is photographed by the optical stereo camera 33 that does not have a direct coordinate relationship with the CT apparatus, and is created from the photographed optical image. A patient 3D model 22 can be created in the CT image coordinate system. Therefore, accurate superimposition is possible by creating the patient 3D model 22 in the CT image coordinate system.

  The patient 3D model 22 created in step S005 is stored in the patient 3D model database 3 (step S006).

  Next, the treatment plan shown in step S011 is performed. In step S012, a treatment plan is created. In step S013, a dose value is calculated. In step S014, the calculated dose value is stored in the dose database 12.

  Next, the process shown in step S021 is performed. The particle beam is irradiated by the particle beam therapy system (step S022). The skin dose display function of the skin dose display device 1 is activated, and the skin dose value is superimposed on the patient 3D model 22 on the screen 21 of the display device 5 installed in the treatment room (step S023). In step S023, by designating the patient ID, the corresponding patient 3D model 22 is read from the patient 3D model database 3 and displayed on the screen 21 of the display device 5 installed in the treatment room. Next, by designating an ID for specifying irradiation (irradiation ID), a dose value corresponding to the irradiation ID is read from the dose database 12 of the treatment planning apparatus and superimposed on the patient 3D model 22. A screen image in which the skin dose value is superimposed and displayed on the patient 3D model 22 is as shown in FIG. In the superimposition process at this time, as described above, since both the patient 3D model 22 and the dose data are associated with the CT image coordinate system, the skin dose value can be accurately superimposed on the patient 3D model 22. Since the screen 21 of the display device 5 of the skin dose display device 1 is a 3D view as shown in FIG. 2, the skin dose display processing unit 2 rotates the patient 3D model 22 in an arbitrary direction three-dimensionally. The skin dose value on the patient 3D model 22 can be confirmed in detail from an arbitrary direction three-dimensionally.

The medical staff confirms the skin dose value on the screen 21 of the display device 5 of the skin dose display device 1 (step S024). Medical staff will determine if post-irradiation treatment is required (
Step S025). When the skin dose value is confirmed by the skin dose display device 1 and it is determined that no post-irradiation treatment is necessary, the process is terminated. When it is determined that a post-irradiation treatment is necessary for a portion with a high skin dose value confirmed by the skin dose display device 1, appropriate treatment such as cooling the portion immediately after the irradiation or applying a medicine in step S026. I do. Thus, the side effect with respect to skin can be suppressed by performing an appropriate treatment about the part with the high skin dose value confirmed with the skin dose display apparatus 1. FIG.

  Although the case where post-irradiation treatment is performed as a corresponding treatment has been described so far, the skin dose display device 1 can also be used when performing pre-irradiation treatment. This will be described with reference to FIG. FIG. 7 is a diagram for explaining another operation of the skin dose display device and a process using this device. 6 differs from FIG. 6 in that an appropriate pre-irradiation treatment is performed with reference to the skin dose display device 1 during irradiation (step S031) instead of step S021. Step S031 different from FIG. 6 will be described.

  Step S031 includes the processes of steps S023 to S029. The same processes of steps S022 and S024 as in FIG. 6 are executed. Next, in step S027, the medical staff determines whether pre-irradiation treatment is necessary. When the skin dose value is confirmed by the skin dose display device 1 and it is determined that the pre-irradiation treatment is not necessary, the process proceeds to step S029. When it is determined that pre-irradiation treatment is necessary for a portion with a high skin dose value confirmed by the skin dose display device 1, an appropriate treatment such as applying a medicine is performed in step S028. Thus, it is possible to suppress the occurrence of side effects on the skin by performing appropriate preventive measures for the portion with a high skin dose value confirmed by the skin dose display device 1. In step S029, a particle beam is irradiated by the particle beam therapy system.

  The skin dose display device 1 according to the first embodiment is highly accurate for the patient 3D model (patient model) 22 displayed on the display device 5 in the treatment room, with the positional relationship between the skin dose value calculated in the treatment plan and the patient body surface. Can be displayed. Since the skin dose value calculated in the treatment plan can be displayed on the patient 3D model (patient model) 22 displayed on the display device 5 in the treatment room with high accuracy, treatment immediately after treatment or before treatment in the treatment room. It is possible to appropriately implement the corresponding treatment, which is a prior treatment. That is, an appropriate treatment such as applying a drug before treatment, or an appropriate treatment such as cooling the part or applying a drug immediately after irradiation, and performing an appropriate treatment for suppressing side effects. Is possible. Therefore, even when the treatment affected part is close to the skin, side effects on the skin can be suppressed.

  As described above, according to the skin dose display device 1 of the first embodiment, the display device 5 is installed so that the skin dose information 23 of the patient 34 calculated in the radiation treatment plan can be visually recognized in the treatment room. A skin dose display apparatus 1 for displaying a patient 3D model generating unit 4 for generating a patient 3D model 22 associated with a coordinate system of CT images used for treatment planning, and skin dose information 23 for the patient 3D model 22. Since the skin dose display processing unit 2 that superimposes and displays on the display device 5 is provided, the patient 3D model (patient model) 22 having a coordinate system associated with the coordinate system of the CT image used for the treatment plan is calculated in the treatment plan. The patient 3D model (patient model) displayed on the display device 5 can be displayed in the treatment room with the positional relationship between the skin dose information calculated in the treatment plan and the patient body surface. Can be displayed on Le) 22 with high accuracy.

Embodiment 2. FIG.
FIG. 8 is a screen image diagram of a display device according to Embodiment 2 of the present invention. The first embodiment is different from the first embodiment in that when a plurality of beams are used for one irradiation, the skin dose value for each beam and the skin dose value after the irradiation with the plurality of beams are displayed on the screen 21 (21b). The screen 21b of the display device 5 of the skin dose display device 1 shown in FIG. 8 shows the beam selection unit 30 and the beam selected by the beam selection unit 30 for each beam when a plurality of beams are used in one irradiation. This is an example having a dose display unit 28 for displaying a skin dose value, a dose display unit 29 and a dose display unit 27 for displaying skin dose values of a plurality of selected beams. This will be described below.

  FIG. 8 shows a case where three beams are used. The beam selection unit 30 can select beam 1, beam 2, and beam 3 used for irradiation. In FIG. 8, beam 1 and beam 2 are selected. When the beam 1 and the beam 2 are selected, three display units for displaying skin dose values appear. In the dose display unit 28, a state in which the isodose curve 23 (23c) of the skin dose value of the beam 1 is displayed on the patient 3D model 22 is displayed. The dose display unit 29 displays a state in which the isodose curve 23 (23d) of the skin dose value of the beam 2 is displayed on the patient 3D model 22. The dose display unit 27 displays a state in which the isodose curve 23 (23c) of the skin dose value after irradiation of the beam 1 and the beam 2 is displayed on the patient 3D model 22.

  The skin dose display device 1 according to the second embodiment displays the isodose curves of the corresponding skin dose values on the selected multiple beam dose display unit 27 and the dose display units 28 and 29 for each beam. Each skin dose value and the skin dose value after irradiation with multiple beams can be confirmed. Further, it is possible to perform a flexible treatment such as performing pre-irradiation treatment or post-irradiation treatment for each beam according to the progress of irradiation.

  8 shows an example in which the beam 1 and the beam 2 are selected when three beams are used. However, when the beam 3 is also selected, the isodose curve 23 of the skin dose value of the beam 3 is shown. A dose display section for displaying the state of displaying is added. The dose display unit 27 displays a state in which the isodose curve 23 of the skin dose values after irradiation of the beam 1, the beam 2, and the beam 3 is displayed on the patient 3D model 22. Further, when a plurality of beams are used in one irradiation, a corresponding treatment may be performed for each beam. By performing the corresponding treatment for each beam, a more flexible and more appropriate treatment can be performed.

Embodiment 3 FIG.
FIG. 9 is a screen image diagram of a display device according to Embodiment 3 of the present invention. The difference from Embodiment 1 is that the skin dose value for each irradiation time is displayed on the screen 21 (21c) when divided irradiation is performed. The screen 21c of the display device 5 of the skin dose display device 1 shown in FIG. 9 has an irradiation time selection unit 40, and the dose display unit 26 (26b) is selected by the irradiation time selection unit 40 for the patient 3D model 22. The isodose curve 23 (23e) of the skin dose value of the irradiated times is displayed.

  The skin dose display device 1 of Embodiment 3 superimposes the isodose curve 23 (23e) of the skin dose value of the selected irradiation time on the patient 3D model 22, thereby performing pre-irradiation treatment and post-irradiation treatment. With regard to the treatment content such as the drug amount, it is possible to make a judgment with reference to the past skin dose value and the future skin dose value to be irradiated. Therefore, an appropriate treatment can be performed for each irradiation.

Embodiment 4 FIG.
FIG. 10 is a screen image diagram of a display device according to Embodiment 4 of the present invention. In the third embodiment, a function of displaying and storing the treatment results in the pre-irradiation treatment and the corresponding treatment after the irradiation is added for each selected irradiation time, and the screen 21 (21d) of the display device 5 of the skin dose display device 1 is added. In addition, a treatment result display unit 41 that displays the treatment result of the corresponding treatment for each irradiation time and a save button 42 that inputs the treatment result after irradiation and saves the content displayed on the treatment result display unit 41 are different.

  The medical staff inputs the treatment results in the corresponding treatment of pre-irradiation treatment and post-irradiation treatment for each irradiation time from an input device (not shown). The input content is displayed on the treatment result display unit 41. By pressing the save button 42, the treatment result of the corresponding time is stored in the dose database 12 in association with the dose value data of the corresponding time.

  The skin dose display device 1 of the fourth embodiment can display and store the treatment results for each selected irradiation time. Since the treatment results for each selected irradiation time can be displayed, when performing treatment in the current irradiation, the skin dose value and treatment results for the past irradiation times can be confirmed. Judgment can be made with reference to treatment results. Therefore, an appropriate treatment can be performed with reference to past treatment results for each irradiation.

  In addition, although the example which the preservation | save button which instruct | indicates preservation | save of the information input by the input device was displayed on the display apparatus 5 was demonstrated, not only when the preservation | save button is displayed on the display apparatus 5, but provided independently. It doesn't matter. The treatment results are not limited to being stored in the dose database 12, and may be stored in another storage device.

Embodiment 5 FIG.
FIG. 11 is a diagram showing a display example of skin dose values according to the fourth embodiment of the present invention. The difference from Embodiments 1 to 4 is that the skin dose value calculated in the treatment plan is projected as an isodose curve 23 (23f) to the patient 34 on the CT bed 35. The skin dose display device 1 according to the fifth embodiment includes a projector 81.

  The medical staff projects the skin dose value calculated in the treatment plan for the patient 34 on the CT bed 35 as an isodose curve 23 (23f) by the projector 81, and applies the pre-irradiation to the fixture inherent to the patient 34. Write markings and comments for the range of treatment and post-irradiation treatment.

  The skin dose display apparatus 1 according to the fifth embodiment performs marking or marking of a range in which a corresponding treatment is performed on a fixture unique to the patient 34 when the patient 34 is imaged in step S003 or when the irradiation posture is confirmed. By writing a comment, it is possible to confirm the markings and comments of the fixture as well as confirming the display content of the display device 5 during actual irradiation. Since the display contents of the display device 5 can be confirmed at the time of actual irradiation, and the markings and comments of the fixture can be confirmed, the pretreatment and irradiation can be performed more efficiently and accurately than in the first to fourth embodiments. Corresponding treatment of post treatment can be performed.

Embodiment 6 FIG.
FIG. 12 is a diagram showing a patient 3D model and a display example according to the sixth embodiment of the present invention. In the first to fourth embodiments, the patient 3D model 22 (22b) generates the contents described in the fixture as texture data when the patient 34 in step S003 is imaged, and the patient to which the texture data is pasted It is different in that it is a 3D model. Texture data 93 is affixed to the patient 3D model 22 (22b). On the screen 26 of the display device 5 of the skin dose display device 1, an isodose curve 23 (23g) of the skin dose value is displayed on the patient 3D model 22 (22b).

  The skin dose display device 1 according to the sixth embodiment can display the content described in the fixture as an integral piece of texture data in the patient 3D model 22 (22b) displayed on the screen 26 of the display device 5. The patient 3D model 22 (22b) according to the sixth embodiment is accompanied by texture data having contents described in the fixture. Positional relationship between the content described on the fixture and the skin dose isodose curve 23 (23g) superimposed on the patient 3D model 22 (22b) when performing pre-irradiation treatment or post-irradiation treatment Can be confirmed on the screen 26 of the display device 5. Therefore, the positional relationship between the content described in the fixture and the isodose curve 23 (23g) of the skin dose superimposed on the patient 3D model 22 (22b) is more accurately confirmed than in the first to fourth embodiments. I can do it. Since the positional relationship between the contents written on the fixture and the isodose curve 23 (23 g) of the skin dose can be confirmed accurately, more appropriate pretreatment and post-irradiation treatment can be performed.

  Note that the contents of Embodiments 1 to 6 can be applied to each other within a consistent range. Moreover, although the display apparatus 5 demonstrated in the example installed in the treatment room, it is not restricted to installing in the treatment room, You may be the case where it is installed so that visual recognition is possible in a treatment room.

DESCRIPTION OF SYMBOLS 1 ... Skin dose display apparatus, 2 ... Skin dose display process part, 4 ... Patient 3D model imaging | photography part (3D model production | generation part), 5 ... Display apparatus, 22, 22a, 22b ... Patient 3D model, 23, 23a, 23b, 23c, 23d, 23e, 23f, 23g ... isodose curve (skin dose information), 30 ... beam selection unit, 34 ... patient, 40 ... irradiation time selection unit, 41 ... treatment result display unit, 42 ... save button, 81 ... Projector, 93 ... texture data.

Claims (15)

A skin dose display device for displaying the patient's skin dose information calculated in a radiation treatment plan on a display device installed so as to be visible in a treatment room,
A patient 3D model generation unit that generates a patient 3D model associated with a coordinate system of CT images used for the treatment plan, and a skin dose display processing unit that displays the skin dose information on the display device in a superimposed manner on the patient 3D model. , A skin dose display device.   The patient 3D model generation unit generates the patient 3D model in which an optical image obtained by photographing the patient with an optical camera and a coordinate system of a CT image used for the treatment plan are associated with each other. Skin dose display device.   The skin dose display apparatus according to claim 1, wherein the 3D model of the patient is a model in which a treatment position of the patient is reflected.   The skin dose display device according to any one of claims 1 to 3, wherein the patient 3D model has the origin of the patient 3D model as the CT image origin of the CT image.   5. The skin dose display device according to claim 2, wherein the optical image in the patient 3D model is obtained by photographing the patient from a plurality of directions by the optical camera.   The skin dose display device according to any one of claims 1 to 5, wherein the skin dose display processing unit displays the patient 3D model by rotating three-dimensionally in an arbitrary direction.   The skin dose display processing unit displays a beam selection unit on the display device when a plurality of beams exist in the treatment plan, and displays the skin dose information in the beam selected by the beam selection unit as the patient 3D model. The skin dose display device according to any one of claims 1 to 6, wherein the skin dose display device is displayed in a superimposed manner.   The skin dose display processing unit, when a plurality of beams are selected by the beam selection unit, superimposes and displays the skin dose information of the selected plurality of beams on the patient 3D model. 8. A skin dose display device according to item 7.   The skin dose display processing unit displays an irradiation time selection unit for selecting an irradiation time of the divided irradiation on the display device when the divided irradiation is planned in the treatment plan, and is selected by the irradiation time selection unit. The skin dose display device according to any one of claims 1 to 8, wherein the skin dose information at the irradiation time is superimposed and displayed on the patient 3D model. It has a save button that instructs to save information input by the input device,
The skin dose display processing unit displays the radiation therapy treatment result display unit on the display device, displays the content of the corresponding treatment input by the input device on the treatment result display unit, and the save button is pressed. The skin dose display device according to any one of claims 1 to 9, wherein the content of the corresponding treatment is stored when it is performed.   The skin dose display processing unit displays, on the treatment result display unit, the content of the corresponding treatment at the irradiation time selected by the irradiation time selection unit when divided irradiation is planned in the treatment plan. The skin dose display device according to claim 10, wherein the device is a skin dose display device. The skin dose display device according to any one of claims 1 to 11, further comprising a projector that projects the skin dose information of the patient calculated in the treatment plan onto the patient.   The patient 3D model generation unit generates information described in a fixture for fixing the patient as texture data when capturing the optical image, and generates the patient 3D model with the texture data. The skin dose display device according to any one of claims 2 to 12, wherein   The skin dose display device according to any one of claims 1 to 13, wherein the skin dose information includes an isodose curve of skin dose values calculated in the treatment plan. A skin dose display method for displaying skin dose information of a patient calculated in a treatment plan of radiation therapy on a display device installed so as to be visible in a treatment room,
A skin dose display method comprising: a procedure for generating a patient 3D model associated with a coordinate system of CT images used for the treatment plan; and a procedure for superimposing and displaying the skin dose information on the patient 3D model on the display device.

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