JP7171285B2 - Radiation therapy support device and program - Google Patents

Description

An embodiment of the present invention relates to a radiotherapy support apparatus and program.

In radiotherapy, image collation is performed to confirm whether or not the treatment site is placed in the correct position immediately before irradiation. For example, an operator sets up a patient by referring to the result of matching images between a CT image for treatment planning and a CT image immediately before irradiation of a patient's tumor.

However, it is up to the operator to decide how to perform the setup work after receiving the image matching result. . Further, when the positional deviation is large, it is necessary to determine whether to correct the position of the patient before treatment, to take a CT image immediately before radiation irradiation, or to start over from re-planning. This decision will have a great impact on the patient's exposure dose.

Japanese Patent Application Laid-Open No. 2015-92 JP 2016-39878 A

The problem to be solved by the invention is to reduce variations in radiotherapy-related work performed by users such as operators.

A radiotherapy support apparatus according to an embodiment is based on image matching between a first medical image for radiotherapy planning of a patient and a second medical image of the patient between the radiotherapy planning and radiation irradiation. and guide information for generating guide information for guiding work related to radiation therapy performed by a user based on the calculated position deviation index. A generator and a display for displaying the guide information are provided.

FIG. 1 is a diagram showing the configuration of a radiotherapy system according to this embodiment. FIG. 2 is a diagram showing the configuration of the radiotherapy support apparatus of FIG. 1. As shown in FIG. FIG. 3 is a diagram showing an example of a guide table stored in the memory of FIG. FIG. 4 is a diagram showing a typical flow of radiotherapy assistance performed by the processing circuit of FIG. FIG. 5 is an example of the guide information display screen displayed in step S4 of FIG. FIG. 6 is a diagram showing an application example of the guide table shown in FIG. FIG. 7 is a diagram showing another application example of the guide table shown in FIG. FIG. 8 is a diagram showing an example of a display screen including a list of multiple positional deviation indicators related to multiple matching targets.

A radiotherapy support apparatus and a program according to this embodiment will be described below with reference to the drawings.

A radiotherapy support apparatus is a computer used to support radiotherapy. A radiotherapy support apparatus is included in a radiotherapy system configured by a plurality of apparatuses related to radiotherapy.

As shown in FIG. 1, the radiotherapy system 100 includes a radiotherapy support device 1, a radiotherapy planning imaging device 2, a radiotherapy planning device 3, a radiotherapy information management system (OIS: Oncology Information System) 4, and an imaging device on the day of treatment. It has a device 5 and a radiotherapy device 6 . The radiotherapy support device 1, the radiotherapy planning imaging device 2, the radiotherapy planning device 3, the radiotherapy information management system 4, the day-of-treatment radiography device 5, and the radiotherapy device 6 are communicably connected to each other via a network. there is

The treatment planning imaging device 2 performs medical imaging on a patient to be treated and generates a medical image used for treatment planning. A medical image for use in treatment planning is hereinafter referred to as a treatment planning image. The treatment plan image may be a two-dimensional image composed of two-dimensionally arranged pixels, or a three-dimensional image composed of three-dimensionally arranged voxels. The treatment planning imaging device 2 may be any modality device capable of generating treatment planning images. Modality devices include, for example, an X-ray computed tomography device, a magnetic resonance imaging device, a cone beam CT device, a nuclear medicine diagnosis device, and the like. The data of the treatment planning image are transmitted to the treatment planning device 3, for example.

The treatment planning apparatus 3 has a computer including a processor such as a CPU (Central Processing Unit), memories such as ROM (Read Only Memory) and RAM (Random Access Memory), a display, an input interface, and a communication interface. The treatment planning device 3 uses the treatment planning image to create a treatment plan for a patient to be treated. The parameters included in the treatment plan include the number of radiation therapy irradiation directions, each irradiation angle, the radiation intensity of each irradiation, the collimator opening of each irradiation, and the like. The treatment planning device 3 identifies the positions and shapes of tumors and organs based on the treatment planning image, and determines various treatment planning parameters. At this time, a treatment plan is created in which the dose to the tumor is as large as possible and the dose to normal tissue is as small as possible. The treatment plan data is supplied to the radiotherapy information management system 4 .

The radiation therapy information management system 4 is a computer system that manages information on radiation therapy in cooperation with the treatment planning device 3, the radiation therapy device 6, and the like. The radiotherapy information management system 4 includes a processor, memory, input device, display, communication device and storage device that a general-purpose computer or workstation has. For example, the radiotherapy information management system 4 manages treatment planning images generated by the treatment planning imaging device 2, treatment plans created by the treatment planning device 3, and the like.

The day-of-treatment imaging device 5 performs medical imaging on a patient to be treated, and generates a medical image for positioning the patient. The day-of-treatment imaging device 5 performs medical imaging of a patient placed on a treatment bed of the radiotherapy apparatus 6 on the day of radiation irradiation by the radiotherapy apparatus 6 and immediately before the radiation irradiation, for example. Hereinafter, the medical image generated by the day-of-treatment imaging device 5 will be referred to as the day-of-treatment image. The image on the day of treatment may be a two-dimensional image composed of two-dimensionally arranged pixels, or a three-dimensional image composed of three-dimensionally arranged voxels. The day-of-treatment imaging device 5 may be any modality device capable of generating a day-of-treatment image. Modality devices include, for example, an X-ray computed tomography device, a magnetic resonance imaging device, a cone beam CT device, a nuclear medicine diagnosis device, and the like. Typically, the same type of modality device is used for the day-of-treatment imaging device 5 and the treatment planning imaging device 2 . The data of the image on the day of treatment is transmitted to the radiotherapy support apparatus 1, for example.

The radiotherapy apparatus 6 treats the patient by irradiating the patient with radiation according to the treatment plan created by the treatment planning apparatus 3 . The radiotherapy apparatus 6 has a treatment platform and a treatment bed provided in the treatment room. The treatment couch moves the top plate so that the patient's treatment area is substantially aligned with the isocenter. The treatment platform supports the irradiation head part rotatably around the rotation axis. The irradiation head unit irradiates radiation according to the treatment plan supplied from the radiation therapy information management system 4 . Specifically, the irradiation head unit forms an irradiation field with a multi-divided diaphragm (multi-leaf collimator), and suppresses irradiation of normal tissues by the irradiation field. By irradiating the treatment area with radiation, the treatment area disappears or shrinks.

The radiotherapy support apparatus 1 is installed in a treatment room in which the radiotherapy apparatus 6 is installed or in a control room adjacent to the treatment room. The radiation therapy support apparatus 1 is a computer that outputs guide information for guiding work related to radiation therapy, according to the result of matching images between a treatment planning image and an image on the day of treatment.

As shown in FIG. 2 , the radiotherapy support apparatus 1 has a processing circuit 11 , memory 13 , input interface 15 , communication interface 17 and display 19 .

The processing circuit 11 has processors such as a CPU (Central Processing Unit) and a GPU (Graphics Processing Unit). The processor implements an image collation function 111 , a guide information generation function 112 , a table update function 113 and a display control function 114 by activating the radiotherapy support program installed in the memory 13 or the like. Note that each of the functions 111-114 is not limited to being realized by a single processing circuit. A processing circuit may be configured by combining a plurality of independent processors, and the functions 111 to 114 may be realized by each processor executing a program.

In the image matching function 111, the processing circuit 11 calculates a positional deviation index for evaluating the positional deviation of the patient based on image matching between the treatment plan image and the treatment day image regarding the patient to be treated. The positional deviation index is calculated for each matching target such as the entire patient region and partial regions of the patient region. The partial region may be either an anatomical site of the patient, a diseased site such as a tumor to be treated, or both. At least one collation target is set. The positional deviation index can be applied to any index that can evaluate the positional deviation between matching targets between the treatment planning image and the treatment day image. Specifically, the positional deviation index is set to the matching degree of the feature amount between the treatment plan image and the treatment-day image relating to the matching object or the variance (scattering degree) of the matching degree. The feature values are, for example, luminance values to be matched, a histogram of luminance values to be matched, and the shape of the target to be matched. The degree of coincidence is defined, for example, as a difference or a ratio of feature amounts between a treatment plan image and an image on the day of treatment regarding a matching target.

In the guide information generation function 112, the processing circuit 11 guides the work related to radiotherapy performed by a user such as an operator (hereinafter referred to as radiotherapy work) based on the positional deviation index calculated by the image matching function 111. Generate guide information for The radiotherapy work includes imaging of treatment planning images by the treatment planning imaging device 2, preparation of treatment plans by the treatment planning device 3, imaging of treatment day images by the day of treatment imaging device 5, and radiation irradiation by the radiotherapy device 6. include work. Specifically, the processing circuit 11 applies the positional deviation index calculated by the image matching function 111 to the guide table 131 stored in the memory 13 to generate guide information. The guide table 131 is a LUT (Look Up Table) or database that associates at least the positional deviation index and the identifier of the radiotherapy work corresponding to the positional deviation index.

As shown in FIG. 3, the guide table 131 has input items and output items. The input items include the conditions for the positional deviation index. As the condition of the positional displacement index, the condition of the positional displacement index corresponding to the radiation therapy work corresponding to the output item is registered. Specifically, the condition is a combination of conditions regarding the degree of matching of a plurality of matching targets and the dispersion of the degree of matching. The output items include the identifier of the setup work recommended to be executed when the condition of the positional deviation index registered in the input item is satisfied, and the identifier of the next step of the radiotherapy work. The setup work is defined by a combination of objects (accessories) used for setup and actions of the operator. The process of radiotherapy work includes, for example, a judgment as to whether or not to perform subsequent radiation irradiation when there is no positional deviation, and recommended radiation work (re-imaging, etc.) when radiation irradiation is not performed. . The identifier may be a letter or a code that indicates a setup task or process. The output item may be a matter that was actually done in the past, or a matter devised by the user.

For example, assume that a headrest is attached to a patient with a brain tumor. If there is a problem with the attachment of the headrest at the time of imaging on the day of treatment, the degree of agreement is low for the tumor area, brain area, and skull related to the head, and for the body trunk such as the lung field and spinal cord, which are not related to the head. The degree of agreement is considered to be high. Therefore, as shown in FIG. 3, the tumor region has a matching degree of 70% or less, the lung field has a matching degree of 70% or more, the spinal cord has a matching degree of 70% or more, the brain region has a matching degree of 70% or less, and the skull region has a matching degree of 70% or less. is 70% or less, "headrest" as the setup work object, "replacement" as the setup work action, and "irradiation impossible" and "re-imaging" as the radiotherapy process are associated.

Also, for example, assume that a brain tumor patient usually wears false teeth. If the dentures are forgotten to be removed at the time of imaging the images on the day of treatment, it is considered that the degree of coincidence of the skull is high and the variance of the degree of coincidence is large. This is because when the degree of matching is high in one portion of a partial region and the degree of matching in other portions is low, the degree of matching in the entire partial region is averaged, but the variance increases. Therefore, for example, as shown in FIG. 3, the tumor area has a matching degree of 70% or more and a variance of 40 or less, the lung field has a matching degree of 70% or more and a variance of 40 or less, and the skull has a matching degree of 70% or less. For the condition with a variance of 80 or more, "dentures" are associated as the target of the setup work, "removal" as the behavior of the setup work, and "impossible irradiation" and "re-imaging" as the radiation therapy process.

In the table update function 113 , the processing circuit 11 updates the guide table 131 by adding, deleting, changing, and the like. For example, the processing circuitry 11 updates according to user instructions via the input interface 15 .

The processing circuit 11 in the display control function 114 displays various information on the display 19 . For example, the processing circuit 11 displays guide information generated by the guide information generation function 112 on the display 19 .

The memory 13 is a storage device such as a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), an SSD (Solid State Drive), or an integrated circuit storage device that stores various information. The memory 13 may be a CD (Compact Disc), a DVD (Digital Versatile Disc), a portable storage medium such as a flash memory, or a driving device for reading and writing various information from/to a semiconductor memory element, etc., in addition to the above storage devices. may be Also, the memory 13 may be in another computer connected to the radiotherapy support apparatus 1 via a network. For example, the memory 13 stores programs and guide tables 131 .

The input interface 15 receives various input operations from the user, converts the received input operations into electrical signals, and outputs the electrical signals to the processing circuit 11 . Specifically, the input interface 15 is connected to input devices such as a mouse, keyboard, trackball, switch, button, joystick, touch pad, and touch panel display. The input interface 15 outputs an electrical signal to the processing circuit 11 according to an input operation to the input device. Also, the input device connected to the input interface 15 may be an input device provided in another computer connected via a network or the like.

The communication interface 17 is an interface for data communication with other devices included in the radiotherapy system 100 . For example, the communication interface 17 receives a treatment plan image from the treatment planning device 3 or the treatment plan image capturing device 2 and receives a treatment day image from the treatment day image capturing device 5 via the network from the PACS.

The display 19 displays various information according to the display control function 114 of the processing circuit 11 . For example, the display 19 displays guide information generated by the guide information generation function 112 . As the display 19, for example, a liquid crystal display (LCD: Liquid Crystal Display), a CRT (Cathode Ray Tube) display, an organic EL display (OELD: Organic Electro Luminescence Display), a plasma display, or any other arbitrary display can be used as appropriate. be.

An operation example of the radiotherapy support apparatus 1 will be described below.

FIG. 4 is a diagram showing a typical flow of radiotherapy support performed by the processing circuit 11 according to a program. As shown in FIG. 4, first, the processing circuit 11 acquires a treatment plan image of a patient to be treated from the treatment plan imaging device 2 or the treatment planning device 3 via the communication interface 17, An image is acquired from the imaging device 5 on the day of treatment (step S1).

After step S1 is performed, the processing circuit 11 executes the image matching function 111 to calculate a positional deviation index based on image matching between the treatment plan image and the treatment day image (step S2). In step S2, the processing circuit 11 calculates a positional deviation index for each matching object. The matching target may be arbitrarily set by the user via the input interface 15, may be automatically set, or may be automatically classified by image processing.

Specifically, the processing circuit 11 calculates the feature amount of the treatment plan image and the treatment day image regarding the matching target. As described above, for example, the luminance value to be matched is set as the feature quantity. In this case, the processing circuit 11 calculates arbitrary statistical values such as the mean value and the mode value of the brightness values of the pixels constituting the matching target for each of the treatment plan image and the treatment day image as the feature amount. When a histogram of luminance values to be compared is set as the feature amount, the processing circuit 11 generates a histogram of luminance values to be compared for each of the treatment plan image and the treatment-day image. A histogram is, for example, a luminance value distribution map in which the horizontal axis is defined as the luminance value and the vertical axis is defined as the frequency. When the shape of the matching target is set as the feature amount, the processing circuit 11 first extracts the matching target for each of the treatment plan image and the treatment day image. The extraction may be performed by any method such as threshold processing, image recognition processing, machine learning, or the like. Next, the processing circuit 11 detects the extracted edge area to be matched. The detected edge area is used as the shape to be matched.

When the feature amount is calculated, the processing circuit 11 calculates the degree of matching between the feature amount of the treatment plan image and the feature amount of the treatment-day image for each matching object. The degree of matching is defined by the difference or ratio of feature amounts.

After step S2 is performed, the processing circuit 11 executes the guide information generation function 112 to generate guide information based on the positional deviation index calculated in step S2 (step S3).

When step S3 is performed, the processing circuit 11 executes the display control function 114 and displays the guide information generated in step S3 on the display 19 (step S4).

Steps S3 and S4 will be specifically described below. The guide information includes, for example, a message regarding radiotherapy work (hereinafter referred to as a guide message).

In step S3, the processing circuit 11 calculates a positional deviation index for each of a plurality of matching targets based on image matching between the treatment plan image and the treatment day image. Specifically, the processing circuit 11 performs image processing on each of the treatment plan image and the treatment day image to extract a plurality of matching targets. Then, the matching degree and the variance of the matching degree are calculated between the matching target derived from the treatment plan image and the matching target of the same kind derived from the treatment day image. For example, when the tumor region, lung field, spinal cord, brain, and skull are set as matching targets, the degree of matching and the variance of the degree of matching are calculated for each of the tumor region, lung field, spinal cord, brain region, and skull.

In step S4, the processing circuitry 11 uses the guide table 131 to identify candidates for radiotherapy work according to the cause of positional displacement estimated from a plurality of positional displacement indices calculated for each matching object. For example, if the matching is 45% for the tumor region, 82% for the lung field, 87% for the spinal cord, 56% for the brain region, and 61% for the skull, the guide table 131 in FIG. "Headrest" as an object, "replacement" as an action of setup work, and "cannot be irradiated" and "re-imaging" as a radiotherapy process are specified as radiotherapy work candidates. Processing circuitry 11 then creates a guide message based on the identified candidates. The guide message may be prepared in advance in a table or the like in association with the combination of the set-up work object and action and the next step of the radiation therapy, which are the output items, or may be prepared in advance in a table or the like. may be automatically generated based on a combination of The processing circuit 11 displays the created guide message on the display 19 as guide information.

FIG. 5 is an example of the guide information display screen IS1. As shown in FIG. 5, the display screen IS1 has an image display area R1 and a message display area R2. In the image display region R1, for example, a composite image of the treatment day image and the treatment plan image is displayed. In the message display region R2, a guide message regarding the radiotherapy operation candidates identified in step S3 is displayed. For example, in the case of the above example, a guide message such as "There is a possibility that the headrest is incorrect, please confirm. If the headrest is replaced, reshooting is recommended." By checking the guide message, the user can identify the cause of the misalignment and start proper setup work. Also, by observing the composite image, it is possible to estimate the reliability of the guide message. Note that the matching target may be emphasized in the synthesized image. Alternatively, only the treatment day image or the treatment plan image may be displayed in the image display region R1. Note that the composite image may be generated by any method based on the treatment day image and the treatment plan image. For example, the processing circuit 11 aligns the treatment day image and the treatment plan image, calculates the luminance value after synthesis of each pixel by α blending, etc., and synthesizes by assigning the luminance value after synthesis to each pixel. Generate an image.

As described above, in step S3, the degrees of matching and variances of the plurality of matching targets are calculated. The processing circuit 11 can detect the portion where the positional deviation occurs by comparing the degree of matching and the size relationship of the variance of the plurality of matching objects. For example, if the match is 45% for the tumor area, 82% for the lung field, 87% for the spinal cord, 56% for the brain area, and 61% for the skull, then the head has a lower match than the other parts. Therefore, it is possible to detect that the head is misaligned. For example, another guide table may be used to associate the site where the displacement occurs with the identifier of the radiotherapy work. The processing circuitry 11 may search the other guide table using the detected positional displacement site as a search key to specify the radiotherapy operation associated with the positional displacement site. The processing circuit 11 preferably displays the specified radiotherapy operation on the display 19 as guide information. For example, if the head is detected as a misaligned part, a guide message such as "The headrest may be wrong, so please check it. If the headrest is replaced, it is recommended to retake the image." be.

As another example, if the image matching detects that only the head portion is tilted, the processing circuit 11 may say, "Align the patient's head portion with the laser. was not performed.” is displayed on the display 19. When the image collation detects that the posture is tilted as a whole, the processing circuit 11 displays on the display 19 a guide message "Please repeat the setup from the beginning. Re-imaging is recommended." In addition, when the overall matching score is not high but the matching score near the tumor is high, the processing circuit 11 outputs "The matching score near the tumor is 87%. In past cases, the treatment was performed as is." is displayed on the display 19.

In the above example, the processing circuit 11 presumes candidates for radiotherapy work from the positional deviation index for each matching object. However, in addition to the misalignment index, other additional factors may be considered in order to more accurately infer candidates for radiotherapy tasks. Additional elements include, for example, patient demographics, patient performance information, previously recorded setup work, previously used fixture information, and patient position during treatment. The basic patient information includes age, growth, weight, sex, and the like. The patient performance information includes whether the patient can walk independently, whether he uses a wheelchair, whether he uses a cane, whether he is bedridden, whether he has dentures, and the like. Previously documented set-up activities included removing dentures, adjusting the tilt of the face, adjusting the angle of the arm, and shifting the position of the entire patient. Previously used fixture information includes bite block, headrest, head shell, chest shell, pelvis shell, footrest, backlock, and the like. Postures of the patient during treatment include stretching, raising both arms, raising one arm, and bending the legs. The guide table 131 may be generated with these additional elements and the condition of the positional deviation index as input items, and the radiotherapy work as an output item.

FIG. 6 is a diagram showing an application example of the guide table 131 shown in FIG. As shown in FIG. 6, the guide table 131 includes, as input items, the conditions of the fixture to be used, the posture during treatment, and the index of positional deviation. By further considering the fixture used and the posture during treatment as input items, it becomes possible to estimate a more appropriate setup work. For example, if the fixture used is unknown, even if only the head region match is low, is the misalignment due to the headrest, the head shell, or some other factor? Unknown. If the positional deviation index condition is met when the fixture used is the "headrest" and the position during treatment is "stretching", it can be inferred with a high degree of certainty that the target of the setup work is the "headrest". can.

FIG. 7 is a diagram showing another application example of the guide table 131 shown in FIG. As shown in FIG. 7, the guide table 131 includes, as input items, the conditions of patient performance information, postural position during treatment, and position deviation index. By further considering the patient performance information and the position during treatment as input items, it becomes possible to estimate a more appropriate setup work. For example, if the patient performance information is "dentures" and the position during treatment is "stretching" and the dislocation index condition is met, it is inferred with high certainty that the target of the setup work is "dentures". be able to.

In the above example, it is assumed that the guide information is a guide message regarding candidates for radiotherapy work. However, this embodiment is not limited to this. The processing circuit 11 may display, as guide information, a list of a plurality of positional deviation indices related to a plurality of matching targets calculated in step S2.

FIG. 8 is a diagram showing an example of the display screen IS2 including a list of multiple positional deviation indicators related to multiple matching targets. As shown in FIG. 8, the display screen IS2 includes an image display area R1 and a list display area R3. In the image display area R1, for example, a composite image of a treatment plan image and an image on the day of treatment is displayed. In the list display region R3, a list of a plurality of positional deviation indices relating to a plurality of matching targets calculated in step S2 is displayed. For example, when the degree of matching is calculated for the tumor region, lung field, spinal cord, brain region, and skull, the numerical value of the degree of matching for each matching object is displayed as shown in FIG. When the variance of the degree of matching is calculated, a numerical value of similar variance may be displayed. It should be noted that the degree of matching and variance may be displayed by graphs or the like instead of numerical values. By displaying a list of positional deviation indexes for each matching object in this way, a user such as an operator can know matching objects with a high degree of matching and matching objects with a low degree of matching.

As output items, not only are both the identifier of the setup work and the identifier of the process in the radiotherapy work recorded, but either the identifier of the setup work or the identifier of the process in the radiotherapy work may be recorded. good. Note that, in the guide table 131, a radiation irradiation identifier may be associated as the next step of the radiation therapy work with a position deviation index condition in which the degree of matching of all irradiation targets is higher than a predetermined value (for example, 90%). . Accordingly, when the degree of coincidence of all irradiation targets is higher than a predetermined value, it is possible to provide a guide message telling that no setup work is required.

After step S4 is performed, the radiotherapy support ends.

After that, a user such as an operator performs radiotherapy with reference to the guide information. As described above, the processing circuit 11 according to the present embodiment estimates the radiotherapy work from the image collation result of the guide table 131, thereby making it easier for the operator to estimate the radiotherapy work from the image collation result alone. , the variability in the radiotherapy work delivered can be reduced. As a result, unnecessary exposure due to re-imaging can be reduced, and careless treatment can be suppressed in a case that should not be treated.

Note that the user may input the displacement index calculated in step S<b>2 and the identifier of the radiotherapy work actually performed or performed via the input interface 15 . The processing circuit 11 registers the input positional deviation index and the identifier of the radiotherapy work in the guide table 131 . In this way, the displacement index calculated in step S2 and the identifier of the radiotherapy work actually performed or performed are stored as empirical knowledge data. As a result, when a similar image matching result is obtained from the next time onward, it becomes possible to display it as one of radiotherapy candidates.

According to at least one embodiment described above, it is possible to reduce the variation in radiotherapy-related work by operators.

The term "processor" used in the above description includes, for example, CPU, GPU, or Application Specific Integrated Circuit (ASIC)), programmable logic device (for example, Simple Programmable Logic Device : SPLD), Complex Programmable Logic Device (CPLD), and Field Programmable Gate Array (FPGA)). The processor realizes its functions by reading and executing the programs stored in the memory circuit. It should be noted that instead of storing the program in the memory circuit, the program may be directly installed in the circuit of the processor. In this case, the processor implements its functions by reading and executing the program embedded in the circuit. Also, functions corresponding to the program may be realized by combining logic circuits instead of executing the program. Note that each processor of the present embodiment is not limited to being configured as a single circuit for each processor, and may be configured as one processor by combining a plurality of independent circuits to realize its function. good. Furthermore, multiple components in FIGS. 1 and 2 may be integrated into a single processor to achieve their functions.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

1 Radiation therapy support device 2 Treatment planning imaging device 3 Treatment planning device 4 Radiation therapy information management system 5 Day of treatment imaging device 6 Radiation therapy device 11 Processing circuit 13 Memory 15 Input interface 17 Communication interface 19 Display 100 Radiation therapy system 111 Image Verification function 112 Guide information generation function 113 Table update function 114 Display control function

Claims (7)

A position for evaluating displacement of the patient based on image matching between a first medical image for radiotherapy planning of the patient and a second medical image of the patient between the radiotherapy planning and irradiation. a calculation unit that calculates a deviation index;
a guide information generation unit that generates guide information for guiding work related to radiation therapy performed by a user based on the calculated positional deviation index;
a display unit that displays the guide information ,
The calculation unit calculates a plurality of positional displacement indices for a plurality of matching targets among the lesion site and other anatomical sites of the patient,
The guide information generation unit identifies, as the work, a setup work according to the cause of the positional deviation estimated from the plurality of positional deviation indicators, and generates the guide information for guiding the setup work,
The setup work is defined by a combination of the accessory used for the patient setup and the action of the operator with respect to the accessory,
Radiotherapy support equipment. 2. The radiotherapy support apparatus according to claim 1 , wherein said guide information generation unit generates, as said guide information, a list of said plurality of positional deviation indices calculated for each of said plurality of matching targets. further comprising a storage unit that associates and stores the positional deviation indicator and the job candidates corresponding to the positional deviation indicator ;
The guide information generation unit determines candidates associated with the plurality of calculated positional deviation indicators, and generates the guide information according to the determined candidates .
3. The radiotherapy support apparatus according to any one of claims 1 and 2 . 4. The radiotherapy support apparatus according to any one of claims 1 to 3 , wherein said work includes a patient setup work for said radiation irradiation and a step following radiotherapy work. 5. The radiotherapy support apparatus according to any one of claims 1 to 4 , further comprising a storage unit that associates and stores the plurality of calculated positional deviation indices and the work performed by the user. 3. The plurality of positional deviation indices are brightness values of the patient between the first medical image and the second medical image, a histogram of brightness values, a degree of matching of shapes, or a variance of the degree of matching. 6. The radiotherapy support apparatus according to any one of 1 to 5 . to the computer,
A position for evaluating displacement of the patient based on image matching between a first medical image for radiotherapy planning of the patient and a second medical image of the patient between the radiotherapy planning and irradiation. a function of calculating a deviation index;
A program for realizing a function of generating guide information for guiding work related to radiation therapy performed by a user based on the calculated positional deviation index, and a function of displaying the guide information on a display. hand,
The calculating function calculates a plurality of positional deviation indices for a plurality of matching targets among the lesion site and other anatomical sites of the patient;
The function of generating the guide information identifies, as the work, a setup work according to the cause of the positional deviation estimated from the plurality of positional deviation indicators, and generates the guide information for guiding the setup work;
The setup work is defined by a combination of the accessory used for the patient setup and the action of the operator with respect to the accessory,
program.

Images