Method and device for verifying the radiation dose delivered to a patient's body

Abstract

The invention relates to a method for verifying the radiation dose delivered by an irradiation device to a patient's body during a radiotherapy treatment, comprising the following steps: during a radiotherapy treatment, the radiation emitted by the irradiation device is measured with a spatially resolving radiation detector after irradiation through the patient's body; the surface of the patient's body is scanned with a surface scanning system during the radiotherapy treatment; the measurement results of the radiation detector and the surface scanning system are temporally associated with one another; the radiation dose delivered to the patient's body during the radiotherapy treatment is verified on the basis of the temporally associated measurement results of the radiation detector and the surface scanning system. The invention also relates to a corresponding device.

Description

[0001] Method and device for verifying the radiation dose delivered to a patient's body

[0002] The invention relates to a method and a device for verifying the radiation dose delivered to a patient's body by an irradiation device during a radiation treatment.

[0003] Radiation therapy is used, for example, as part of cancer treatment. High-energy radiation, usually generated by a linear accelerator, is directed at a target volume in the patient's body, which may contain a tumor. The target volume to be irradiated by the radiation device is determined as part of the treatment planning. An imaging technique, such as a CT scan, is used to create a three-dimensional image of the patient's body, and a treating physician defines the target volume based on the acquired image. Naturally, it is desirable to direct and limit the radiation dose delivered to the patient's body by the radiation device as precisely as possible to the target volume in order to ensure the best possible treatment outcome and to cause as little damage to surrounding tissue as possible.

[0004] To determine the radiation dose delivered to the patient's body during radiation treatment, it is known to measure the portion of the radiation emitted by the radiation device that penetrates the patient's body. For this purpose, a radiation detector is arranged on a side of the radiation device opposite the patient's body so that it can measure the radiation emerging from the patient's body with spatial resolution. From the recorded image, with knowledge of the characteristics of the radiation device, the radiation dose remaining in the patient's body, in particular the previously defined target volume, can be calculated. Such methods are known, for example, from US 6 853 702 B2, US 8 351 572 B1, US 8 605 857 B1 and US 10 994 115 B1. Using the known methods, the radiation dose delivered to defined areas of the patient's body during radiation treatment can be determined.A patient's radiation therapy typically involves multiple radiation treatments administered consecutively over an extended period of time. To reliably determine the radiation dose, it is crucial that the patient's body remains in the same spatial position during each radiation treatment. Otherwise, an incorrect radiation dose determination may occur. This involves considerable effort and carries a risk of incorrect radiation dose determination.

[0005] Based on the prior art explained above, the object of the invention is to provide a method and a device of the type mentioned at the outset with which the radiation dose actually delivered to the patient's body can be verified in a simple and reliable manner.

[0006] The invention solves the problem by the independent claims 1 and 14. Advantageous embodiments can be found in the dependent claims, the description and the figures.

[0007] For a method of the type mentioned above, the invention solves the problem by the following steps:

[0008] • During a radiation treatment, the radiation emitted by the radiation device is measured with a spatially resolving radiation detector after it has passed through the patient's body,

[0009] • the surface of the patient's body is recorded during the radiation treatment using a surface detection system, • the measurement results of the radiation detector and the surface detection system are temporally assigned to each other,

[0010] • Based on the temporally correlated measurement results of the radiation detector and the surface detection system, the radiation dose delivered to the patient's body during the radiation treatment is verified.

[0011] For a device of the type mentioned above, the invention solves the problem in that the device comprises:

[0012] • a spatially resolving radiation detector designed to measure the radiation emitted by the irradiation device after irradiation through the patient’s body,

[0013] • a surface detection system designed to detect the surface of the patient’s body during the radiation treatment,

[0014] • an evaluation device which is designed to assign the measurement results of the radiation detector and the surface detection system to each other in time,

[0015] • wherein the evaluation device is further designed to verify the radiation dose delivered to the patient's body during the radiation treatment on the basis of the temporally associated measurement results of the radiation detector and the surface detection system.

[0016] The irradiation device can be a linear accelerator that emits high-energy radiation onto the patient's body, particularly for cancer treatment. The device according to the invention can also comprise the irradiation device. According to the invention, the radiation emitted by the irradiation device onto the patient's body is first measured in a spatially resolved manner, as is known in the prior art, using a radiation detector, in particular with two-dimensional spatial resolution, after irradiating the patient's body. Thus, the portion of the radiation emitted by the irradiation device that penetrates the patient's body is detected. Knowing the radiation output emitted by the irradiation device, the portion of radiation absorbed by the patient's body, and thus the radiation dose, can be determined in the manner described in the prior art explained above.The spatially resolved measurement of the radiation detector allows the radiation dose absorbed by a specific volume in the patient's body, for example, a specific organ, to be recorded. The radiation detector forms an imaging system and is arranged during radiation treatment on a side of the patient's body opposite the radiation device, for example, below and / or next to a patient bed that accommodates the patient's body during radiation treatment. The device according to the invention can also include the patient bed. From the images recorded by the radiation detector, the radiation dose remaining in the patient's body can be spatially recalculated using suitable software, as described in the prior art explained above.Such measurement systems for recording radiation dose are also referred to as Electronic Portal Imaging Devices (EPIDs). The corresponding calculation methods for determining the radiation dose absorbed by a specific target volume are known as "RadCalc EPID." The radiation detector can perform the measurement repeatedly, particularly continuously, during a radiation treatment.

[0017] According to the invention, the three-dimensional surface of the patient's body is further captured during the radiation treatment in the irradiation room containing the irradiation device, using a particularly camera-based surface capture system. The surface capture system can comprise multiple cameras that capture the patient's body from different directions. From the camera images, the three-dimensional surface of the patient's body can be captured in a manner known per se in the coordinate system of the irradiation room. The cameras scan the surface of the patient's body. Surface capture systems of the type described are also referred to as surface imaging systems (SI systems).By repeatedly, and in particular continuously, scanning the surface of the patient's body during radiation treatment, changes in the surface of the patient's body can be detected not only between different radiation treatments or between an image of the patient's body taken as part of radiation planning, such as a CT scan, and the radiation treatment itself, but also changes in the surface of the patient's body during an ongoing radiation treatment. The surface detection system can detect changes in the patient's body's position and location, as well as changes in the patient's body, such as a change in weight during radiation therapy administered over an extended period. All of these changes influence the spatial location of the target volume for the radiation treatment.

[0018] According to the invention, the two known measurement methods are correlated with each other to enable an improved assessment of the radiation dose actually absorbed by the patient's body at a specific location. For this purpose, the measurement results of the radiation detector and the surface detection system are temporally correlated with each other, such that simultaneously obtained measurement results of the radiation detector and the surface detection system can be compared with each other. On this basis, the radiation dose actually delivered to the patient's body during the radiation treatment is verified. Thus, the patient's body surface information obtained with the surface detection system is temporally linked with the dose information obtained by the spatially resolving radiation detector.The image data from the surface detection system can be linked to the image data from the radiation detector via the time stamp of the measurement result recordings. These can be recorded, for example, in log data from cameras or the radiation detector. The combination of the two measurement methods in the manner according to the invention makes it possible to determine in a simple and reliable manner, even in the event of changes in the position or shape of the patient's body, which radiation dose was delivered to a target volume of the patient's body to be irradiated at a specific time during the irradiation, and whether this radiation dose corresponds to the radiation dose for the target volume planned as part of the irradiation planning. If deviations are detected between the planned or intended and the actual radiation dose for the target volume, these may be spatial deviations, i.e. that the irradiated volume does not exactly correspond to the target volume, orIf there are any deviations in the radiation output absorbed by the target volume, such as that the target volume has not been fully irradiated, or if there are deviations in the radiation output absorbed by the target volume, this can be determined quickly and reliably according to the invention, and appropriate measures can be taken. For example, the inventive linking of the measurement methods can detect positioning errors of the patient's body on a patient couch, movements of the patient's body during radiation treatment, or changes in the shape of the patient's body. Irradiation device errors that occur during radiation treatment can also be detected, for example, an undesired change in the radiation output or in the irradiation field generated by the irradiation device. The radiation treatment can be optimized on this basis.

[0019] According to one embodiment, the radiation dose delivered to a specific volume of the patient's body can be calculated from the measurement results of the radiation detector, taking into account the time-related measurement results of the surface detection system, in particular the radiation dose delivered to a target volume determined during radiation treatment. The target volume can, for example, be a specific organ in the patient's body to be treated with radiation or correspond to a tumor to be treated.

[0020] Based on the correlation of the measurement results according to the invention, conclusions can be drawn about the specific volume or target volume. In particular, it is possible for the specific volume or target volume to be changed accordingly if the surface of the patient's body detected by the surface detection system changes during the radiation treatment and / or between radiation treatments carried out consecutively within the framework of radiation therapy and / or if the surface of the patient's body detected by the surface detection system changes compared to a surface of the patient's body detected within the framework of radiation planning. For example, if a change in the location, position and / or shape of the patient's body is detected during radiation treatment, the target volume for which the radiation dose is determined can be adjusted.Based on detected changes in the patient's body surface, the radiation dose actually delivered to the target volume, which has changed its location or position, can be determined. As explained, during radiation planning, the patient's body is scanned using an imaging technique, such as a CT scan. A treating physician determines the target volume to be irradiated based on the resulting three-dimensional image of the patient's body. This radiation planning takes place before the start of radiation therapy, which in turn can consist of several spaced-apart radiation treatments. The aforementioned configurations allow changes during an ongoing radiation treatment and / or changes compared to a previous radiation planning session and / or a previous radiation treatment to be detected and taken into account.According to a further embodiment, it can be provided that a combined model of the patient's body is generated from the measurement results of the surface detection system determined during the radiation treatment and from image data of the patient's body determined before the radiation treatment in an imaging method, in particular a CT method. The combined model of the patient's body can be taken into account when calculating the radiation dose delivered to a specific volume of the patient's body. The combined model represents an at least partially synthetic model of the patient's body, for the generation of which data from an imaging method, for example a planning CT or a cone beam CT (CBCT), are combined with data from the surface detection system, i.e. the current patient surface, preferably in real time.The expected dose distribution for a specific volume of the patient's body, especially the target volume, can thus be calculated, preferably in real time, using a dose algorithm taking the planning data into account. Measurement data from the radiation detector are used and stored and can be compared with the dose distribution from the planning and the dose distribution from the synthetic planning data from the combined model.

[0021] According to a further embodiment, it is also possible for the measurement results of the surface acquisition system to be used for the combined model of the patient's body for areas of the patient's body that are not fully captured in the imaging procedure. For example, in cases where the field of view of an imaging procedure, in particular a CT, for example a CBCT, is not large enough to capture the entire patient's body, a "hybrid" dataset can be created from the data of the imaging procedure, in particular a CBCT and a planning CT used to determine the original planning data, as well as the measurement data of the surface acquisition system. A deformable registration is applied to the original data in the areas where no information from the imaging procedure is available.

[0022] According to a further embodiment, the measurement results of the radiation detector and / or the surface detection system and / or the combined model of the patient's body and / or the radiation dose delivered to the patient's body, in particular the radiation dose delivered to a specific volume of the patient's body, can be displayed to a user. For this purpose, the device according to the invention can comprise a display device. The display device can be integrated into the evaluation device or formed on it. However, it can also be formed separately from the evaluation device. It can be formed, for example, by a computer, a tablet, or a smartphone. The evaluation device can also be formed on a computer, a tablet, or a smartphone. For example, a computer can be located in the irradiation room or in another room.A user, such as a treating physician, can adjust the radiation treatment based on the displayed measurement results or the displayed radiation dose, for example, by changing the position and / or orientation of the patient's body by moving a patient bed and / or controlling the radiation device. By displaying the combined model of the patient's body and / or the calculated dose distribution, the user can intervene during the current radiation treatment and / or subsequent radiation treatments.

[0023] According to a further embodiment, a movement tolerance for the patient during radiation treatment can be specified based on the measurement results of the radiation detector and / or the surface detection system and / or the combined model of the patient's body and / or the radiation dose delivered to the patient's body, in particular the radiation dose delivered to a specific volume of the patient's body. For example, if it is determined that a certain movement of, for example, + / - 3 mm leads to stress on an organ at risk and a smaller movement of, for example, + / - 2 mm does not, the permitted movement tolerance can be adjusted accordingly. Likewise, the treatment can be made more efficient if the simulation shows that even a greater movement tolerance than currently specified does not lead to a deterioration in the treatment outcome.This would allow the patient to be irradiated more quickly, as he or she would remain within the permitted movement tolerance band for a longer period of time.

[0024] According to a further embodiment, it can be provided that, based on the determination or verification of the radiation dose delivered to the patient's body, in particular if a deviation is detected between the radiation dose delivered to the patient's body and an intended or planned radiation dose to be delivered to the patient's body, an irradiation plan for at least one subsequent irradiation treatment and / or the radiation output and / or the irradiation field of the irradiation device and / or the position of the patient's body is adjusted, preferably by adjusting the position of a patient couch supporting the patient's body. If a deviation is detected, for example, the patient's position can be corrected and / or a proposal for a new irradiation plan can be calculated for subsequent irradiation treatments.The adjustment can take place during the ongoing radiation treatment, preferably in real time, and / or after a radiation treatment has taken place. The adjustment can take place manually, as explained, or automatically, for example, controlled by the evaluation device or by a separate control device. A patient bed can usually be moved, for example, linearly in all three spatial directions and, if necessary, tilted about the longitudinal and / or transverse axis. On the one hand, the radiation device emits the radiation with a radiation output that is generally adjustable. On the other hand, the radiation device has an irradiation field that can be adjusted, for example, by movable slats and / or a movement of the radiation device. These parameters can be adjusted accordingly.

[0025] According to a further embodiment, it can be provided that the temporal allocation of the measurement results of the radiation detector and the surface detection system and / or the verification of the radiation dose delivered to the patient's body takes place during the radiation treatment and / or after a radiation treatment has been completed. Thus, it is possible, on the one hand, for the radiation dose to be determined or verified in the manner according to the invention during an ongoing radiation treatment, in particular in real time, i.e., "infra," or for this to take place after the completion of a radiation treatment, for example, between two radiation treatments within the scope of a radiation therapy, i.e., "intra," or after the completion of the last radiation treatment of a radiation therapy. If the allocation of the measurement results and / or the verification of the radiation dose takes place during a radiation treatment, this can take place continuously and / or in real time.If the allocation and determination of the radiation dose takes place after a radiation treatment, this can be done offline.

[0026] As explained, the radiation detector is arranged on a side of the patient's body opposite the radiation treatment device. In particular, the radiation detector can be arranged below and / or next to the patient's body during radiation treatment. For example, the radiation detector can be arranged on the radiation treatment device so that it rotates with the device during normal rotation during radiation treatment, allowing it to measure the radiation emerging from the patient's body at any time.

[0027] The method according to the invention can be carried out using the device according to the invention. Accordingly, the device according to the invention, in particular its evaluation device, can be designed to carry out the method according to the invention.

[0028] An embodiment of the invention is explained in more detail below with reference to a drawing. The single figure shows a device according to the invention very schematically.

[0029] The device shown in the figure comprises an irradiation device 10, which may, for example, be a linear accelerator 10, for irradiating a patient body 14 arranged on a patient couch 12 that can be moved within the room. The patient couch 12 stands on a base 16 on the floor of an irradiation room accommodating the irradiation device 10. A radiation detector 18 is arranged on a side of the patient body 14 opposite the irradiation device 10, below the patient body in the figure. The radiation detector 18 is attached to a support 21 of the irradiation device 10 via a holder 20. In this way, the radiation detector 18 can rotate with the irradiation device 10 as it rotates during a radiation treatment.

[0030] Radiation 22 emitted by the irradiation device 10 strikes a section of the patient's body 14 to be irradiated, in the figure, for example, the patient's head 24. Part of the radiation 22 is absorbed by the patient's body 14, and part passes through the patient's body 14 and the patient bed 12 arranged underneath. This portion of the radiation passing through the patient's body 14 is measured by the spatially resolved radiation detector 18. The measurement results of the radiation detector 18 are transmitted to an evaluation device 26 with a display device 28, for example, via a wireless or wired connection. The evaluation device 26 creates a spatially resolved radiation image on this basis.Using software stored in the evaluation device 26, the radiation dose delivered to the patient's body 14 is calculated from the recorded radiation image, particularly for a specific volume, for example, a target volume defined during radiation planning, in which, for example, a tumor is located. This calculation of the radiation dose based on the measurement results recorded by the radiation detector is known from the aforementioned prior art.

[0031] The device further comprises a surface detection system 30 comprising three cameras 32 that record the patient's body 14 from different directions. The images from the camera 32 are also transmitted to the evaluation device 26 via wireless or wired connections. The evaluation device 26 uses these images, also using suitable software, as is known per se, to determine the three-dimensional surface of the patient's body 14 in the irradiation room. The measurement results from the radiation detector 18 and the surface detection system 30, in particular from the cameras 32, are temporally assigned to one another in the evaluation device 26, so that simultaneous measurement results can be compared with one another.Based on the temporally associated measurement results of the radiation detector 18 and the surface detection system 30, in particular the cameras 32, the evaluation device 26 determines the radiation dose actually delivered to the patient's body 14, in particular the previously defined target volume. The surface detection system 30 can detect changes in the surface of the patient's body 14 and thus changes in the location, position, and / or shape of the patient's body 14 during an ongoing radiation treatment and / or between different radiation treatments and / or between a radiation planning session and a radiation treatment. Taking into account detected changes in the patient's body 14, the radiation dose actually delivered to the target volume can be reliably verified.

[0032] The results of the evaluation device 26, including the measurement results of the radiation detector 18 and the surface detection system 30, can be displayed on the display device 28 of the evaluation device 26 for a user, for example, a treating physician. Based on this, the user can, for example, control the patient couch 12 to move the patient body 14 appropriately within the room. The user can also, for example, control the irradiation device 10, for example, by changing the radiation output of the irradiation device 10 and / or the irradiation field of the irradiation device 10. It is also possible for the aforementioned adjustments to be made automatically based on the radiation dose determined according to the invention, for example, by the evaluation device 26.

[0033] The method explained above can be carried out continuously during a radiation treatment, for example, in real time. In this way, parameters such as the position of the patient's body 14 or the radiation parameters of the radiation device 10 can be adjusted even during an ongoing radiation treatment. Additionally or alternatively, it is also possible for the method described above to be carried out after completion of a radiation treatment and for the results to be taken into account, for example, in the planning of a subsequent radiation treatment within the framework of radiation therapy taking place over a longer period, by making appropriate adjustments, for example, with regard to the position of the patient's body 14 or the radiation device 10. List of Reference Symbols

[0034] 10 Irradiation device

[0035] 12 patient beds

[0036] 14 patient bodies

[0037] 16 sockets

[0038] 18 Radiation detector

[0039] 20 bracket

[0040] 21 carriers

[0041] 22 Radiation

[0042] 24 section to be irradiated

[0043] 26 Evaluation device

[0044] 28 Display device

[0045] 30 Surface detection system

[0046] 32 Camera

Claims

Claims 1. A method for verifying the radiation dose delivered by an irradiation device (10) to a patient's body (14) during a radiation treatment, characterized by the steps: • during a radiation treatment, the radiation (22) emitted by the radiation device (10) is measured with a spatially resolving radiation detector (18) after irradiating the patient's body (14), • the surface of the patient's body (14) is detected during the radiation treatment using a surface detection system (30), • the measurement results of the radiation detector (18) and the surface detection system (30) are assigned to each other in time, • on the basis of the temporally associated measurement results of the radiation detector (18) and the surface detection system (30), the radiation dose delivered to the patient's body (14) during the radiation treatment is verified.

2. Method according to claim 1, characterized in that the radiation dose delivered to a specific volume of the patient's body (14) is calculated from the measurement results of the radiation detector (18) taking into account the time-associated measurement results of the surface detection system (30).

3. Method according to claim 2, characterized in that the determined volume is determined upon a change in the surface of the patient's body (14) detected by the surface detection system (30) during the radiation treatment and / or between radiation treatments and / or if the surface of the patient's body (14) detected by the surface detection system (30) changes compared to a surface of the patient's body (14) detected within the scope of irradiation planning, it is changed accordingly.

4. Method according to one of the preceding claims, characterized in that a combined model of the patient's body (14) is generated from the measurement results of the surface detection system (30) determined during the irradiation treatment and from image data of the patient's body (14) determined before the irradiation treatment in an imaging method, in particular a CT method.

5. Method according to claim 4 and one of claims 2 or 3, characterized in that the combined model of the patient's body is taken into account in the calculation of the radiation dose delivered to a specific volume of the patient's body (14).

6. Method according to one of claims 4 or 5, characterized in that for areas of the patient's body (14) not completely captured in the imaging method, the measurement results of the surface detection system (30) are used for the combined model of the patient's body (14).

7. Method according to one of the preceding claims, characterized in that the measurement results of the radiation detector (18) and / or the surface detection system (30) and / or the combined model of the patient's body (14) and / or the radiation dose delivered to the patient's body (14), in particular to a specific volume of the patient's body (14), are displayed to a user.

8. Method according to one of the preceding claims, characterized in that a movement tolerance for the patient during a radiation treatment is specified on the basis of the measurement results of the radiation detector (18) and / or the surface detection system (30) and / or the combined model of the patient's body (14) and / or the radiation dose delivered to the patient's body (14), in particular the radiation dose delivered to a specific volume of the patient's body (14).

9. Method according to one of the preceding claims, characterized in that on the basis of the verification of the radiation dose delivered to the patient's body (14), in particular in the event of a detected deviation of the radiation dose delivered to the patient's body (14) from an intended radiation dose to be delivered to the patient's body (14), an irradiation plan for at least one subsequent irradiation treatment and / or the radiation power and / or the irradiation field of the irradiation device (10) and / or the position of the patient's body (14) is adapted, preferably by adjusting the position of a patient couch (12) receiving the patient's body (14).

10. Method according to claim 9, characterized in that the adjustment takes place during the radiation treatment and / or after a radiation treatment has taken place.

11. Method according to one of the preceding claims, characterized in that the temporal allocation of the measurement results of the radiation detector (18) and the surface detection system (30) and / or the verification of the radiation dose delivered to the patient's body (14) during radiation treatment and / or after radiation treatment.

12. Method according to one of the preceding claims, characterized in that the radiation detector (18) is arranged below and / or next to the patient's body (14) during the radiation treatment.

13. Method according to one of the preceding claims, characterized in that it is carried out with a device according to one of claims 10 to 18.

14. Device for verifying the radiation dose delivered by an irradiation device (10) to a patient's body (14) during a radiation treatment, characterized in that the device comprises: • a spatially resolving radiation detector (18) which is designed to measure the radiation (22) emitted by the irradiation device (10) after irradiation through the patient's body (14), • a surface detection system (30) designed to detect the surface of the patient's body (14) during the radiation treatment, • an evaluation device (26) which is designed to assign the measurement results of the radiation detector (18) and the surface detection system (30) to one another in time, • wherein the evaluation device (26) is further designed to calculate the radiation dose delivered to the patient’s body (14) during the radiation treatment on the basis of the temporally associated To verify measurement results of the radiation detector (18) and the surface detection system (30).

15. Device according to claim 14, characterized in that the irradiation device (10) comprises a linear accelerator (10) and the radiation detector (18) is a detector for linear accelerator radiation and / or that the surface detection system (30) comprises a plurality of cameras (32) directed towards the patient's body (14).

16. Device according to one of claims 14 or 15, characterized in that the evaluation device (26) is further designed to calculate the radiation dose delivered to a specific volume of the patient's body (14) from the measurement results of the radiation detector (18) taking into account the time-associated measurement results of the surface detection system (30).

17. Device according to claim 16, characterized in that the evaluation device (26) is designed to change the determined volume accordingly in the event of a change in the surface of the patient's body (14) detected by the surface detection system (30) during the radiation treatment and / or between radiation treatments and / or in the event of a change in the surface of the patient's body (14) detected by the surface detection system (30) compared to a surface of the patient's body (14) detected within the framework of radiation planning.

18. Device according to one of claims 14 to 17, characterized in that the evaluation device (26) is designed to determine from the measurement results of the Surface detection system (30) and to generate a combined model of the patient's body (14) from image data of the patient's body (14) determined before the radiation treatment in an imaging method, in particular a CT method.

19. Device according to claim 18 and one of claims 16 or 17, characterized in that the evaluation device (26) is designed to take into account the combined model of the patient's body when calculating the radiation dose delivered to a specific volume of the patient's body (14).

20. Device according to one of claims 18 or 19, characterized in that the evaluation device (26) is designed to use the measurement results of the surface detection system (30) for the combined model of the patient's body (14) for areas of the patient's body (14) that are not completely captured in the imaging method.

21. Device according to one of claims 114 to 20, characterized in that it further comprises a display device (28) for displaying the measurement results of the radiation detector (18) and / or the surface detection system (30) and / or the combined model of the patient's body (14) and / or the radiation dose delivered to the patient's body (14), in particular to a specific volume of the patient's body (14), for a user.

22. Device according to one of claims 14 to 21, characterized in that the evaluation device (26) is designed to, on the basis of the measurement results of the radiation detector (18) and / or the surface detection system (30) and / or the combined model of the Patient's body (14) and / or the radiation dose delivered to the patient's body (14), in particular to a specific volume of the patient's body (14), to provide a movement tolerance for the patient during a radiation treatment.

23. Device according to one of claims 14 to 22, characterized in that the evaluation device (26) is designed to adapt an irradiation plan for at least one subsequent irradiation treatment and / or the radiation power and / or the irradiation field of the irradiation device (10) and / or the position of the patient body (14) on the basis of the verification of the radiation dose delivered to the patient body (14), in particular in the event of a detected deviation of the radiation dose delivered to the patient body (14) from an intended radiation dose to be delivered to the patient body (14), preferably by adapting the position of a patient couch (12) receiving the patient body (14).

24. Device according to claim 23, characterized in that the evaluation device is designed to carry out the adjustment during the radiation treatment and / or after a radiation treatment has taken place.

25. Device according to one of claims 14 to 24, characterized in that the evaluation device (26) is designed to carry out the temporal assignment of the measurement results of the radiation detector (18) and the surface detection system (30) and / or the verification of the radiation dose delivered to the patient's body (14) during the radiation treatment or after a radiation treatment has taken place.

26. Device according to one of claims 14 to 25, characterized in that the radiation detector (18) is arranged below and / or next to a patient bed (12) which receives the patient's body (14) during a radiation treatment.

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