Radiation absorption amount management device and radiation absorption amount management method
阅读说明:本技术 吸收辐射量管理装置及吸收辐射量管理方法 (Radiation absorption amount management device and radiation absorption amount management method ) 是由 徐谢平 李琳 王忆谨 小西勇人 于 2019-04-08 设计创作,主要内容包括:一种吸收辐射量管理装置及吸收辐射量管理方法,对医疗人员的重要器官所吸收的辐射量进行管理。吸收辐射量管理装置具有:辐射量空间分布信息取得部,取得基于摄影条件而计算出的与辐射量空间分布有关的信息,该摄影条件与通过放射线图像诊断装置执行的摄影相对应;位置信息取得部,取得上述放射线图像诊断装置周边的医疗人员的部位在上述辐射量空间分布中的位置信息;辐射量信息取得部,基于上述位置信息,取得与上述部位所受到的辐射量有关的信息;以及显示控制部,以在显示部上显示与上述辐射量有关的信息的方式进行控制。(An absorbed radiation amount management device and an absorbed radiation amount management method manage the amount of radiation absorbed by vital organs of medical staff. The absorbed radiation amount management device includes: a radiation amount spatial distribution information acquisition unit that acquires information relating to a radiation amount spatial distribution calculated based on imaging conditions corresponding to imaging performed by the radiographic image diagnostic device; a position information acquiring unit that acquires position information of a part of a medical staff near the radiographic image diagnostic apparatus in the radiation dose spatial distribution; a radiation amount information acquiring unit that acquires information relating to an amount of radiation received by the part, based on the positional information; and a display control unit that controls the display unit to display information relating to the radiation amount.)
1. An absorbed radiation management apparatus comprising:
a radiation amount spatial distribution information acquisition unit that acquires information relating to a radiation amount spatial distribution calculated based on imaging conditions corresponding to imaging performed by the radiographic image diagnostic device;
a position information acquiring unit that acquires position information of a part of a medical staff near the radiographic image diagnostic apparatus in the radiation dose spatial distribution;
a radiation amount information acquiring unit that acquires information relating to an amount of radiation received by the part, based on the positional information; and
and a display control unit that controls the display unit to display information relating to the radiation amount.
2. The radiation-absorbing amount management apparatus according to claim 1,
the position information acquiring unit acquires position information of the part of the medical staff in the radiation dose spatial distribution based on posture information of the medical staff in the radiation dose spatial distribution.
3. The radiation-absorbing amount management apparatus according to claim 2,
the position information acquiring unit acquires posture information of the spatial distribution of the radiation dose of the medical staff by a motion detecting means, and acquires position information of the part of the medical staff in the spatial distribution of the radiation dose based on the posture information.
4. The absorbed radiation amount management apparatus according to claim 3,
the position information acquiring unit further acquires position information of a part of the medical staff in the radiation dose spatial distribution based on anatomical position information corresponding to the medical staff.
5. The radiation-absorbing amount management apparatus according to claim 1,
the position information acquiring unit acquires position information of the medical staff moving during the examination by tracking the medical staff.
6. The radiation-absorbing amount management apparatus according to claim 1,
the medical imaging apparatus further includes a guidance information output unit that provides guidance information to the medical staff based on imaging conditions before imaging is started, thereby reducing or avoiding an amount of absorbed radiation.
7. The radiation-absorbing amount management apparatus according to claim 1,
the imaging conditions include scan parameters and information about the patient.
8. The radiation-absorbing amount management apparatus according to claim 1,
the radiation amount spatial distribution correction device further includes a correction unit that corrects the radiation amount spatial distribution based on a correction factor obtained by the imaging unit, the correction factor including at least one of information relating to a medical staff and information relating to a patient.
9. The radiation-absorbing amount management apparatus according to claim 1,
the imaging device further comprises an alarm unit for generating an alarm by displaying or presenting an alarm by sound on the display unit when the amount of radiation received after the start of imaging exceeds a predetermined threshold.
10. The radiation-absorbing amount management apparatus according to claim 6,
the guidance information output unit outputs guidance information when the amount of radiation received after the start of imaging exceeds a preset threshold.
11. The radiation-absorbing amount management apparatus according to claim 1,
the display unit displays the cumulative radiation dose of a plurality of vital organs in each operation.
12. The radiation-absorbing amount management device according to claim 6 or 10,
the display unit displays the guidance information provided to the medical staff.
13. The radiation-absorbing amount management apparatus according to claim 1,
the medical image processing apparatus further includes a storage unit for storing a plurality of image information related to the movement of the medical staff.
14. The radiation-absorbing amount management apparatus according to claim 11,
the display unit highlights the detected vital organ based on a detection result of the position detection.
15. The radiation-absorbing amount management apparatus according to claim 1,
the display unit displays the real-time spatial distribution of the radiation amount and the position of the medical staff with the vital organs highlighted on the plurality of image data, and guides the medical staff to a safe working position.
16. The radiation-absorbing amount management apparatus according to claim 1,
further provided with:
a radiation amount simulation unit that generates a three-dimensional simulation diagram of spatial distribution of the amount of radiation in the room;
a storage unit that stores moving image data relating to the movement of the medical staff and the amount of radiation received by the part; and
and a video stream generating unit that generates a video stream in which the moving image data and the three-dimensional simulation diagram are combined.
17. The radiation-absorbing amount management apparatus according to claim 16,
the display unit displays the video stream so as to guide medical staff to a safe position.
18. A method for managing an amount of absorbed radiation, wherein,
the method comprises the following steps:
a radiation amount spatial distribution information acquisition step of acquiring information on a radiation amount spatial distribution calculated based on imaging conditions corresponding to imaging performed by the radiographic image diagnostic apparatus;
a position information acquisition step of acquiring position information of a part of a medical staff around the radiographic image diagnostic apparatus in the radiation dose spatial distribution;
a radiation amount information acquisition step of acquiring information relating to the amount of radiation received by the part based on the positional information; and
and a display control step of controlling the display unit to display information relating to the radiation amount.
Technical Field
The present invention relates to an absorbed radiation amount management device and an absorbed radiation amount management method, and more particularly, to an absorbed radiation amount management device and an absorbed radiation amount management method capable of reducing or avoiding an amount of radiation absorbed by medical staff.
Background
In a medical field where radiography is performed, it is known that radiation exposure is given to a patient by radiography. In recent years, attention has been paid to the management of the radiation dose of a patient. Therefore, it is necessary to store the radiation dose received by the patient due to radiography, and to grasp and manage the accumulated radiation dose of the patient.
As a method of measuring the radiation dose received by a patient, for example, a method of providing an area dose to a radiation source that emits radiation and obtaining the radiation dose of the patient based on a value measured by the dose, and a method of acquiring the radiation dose of the patient using an image signal detected by a radiation image detector that detects a radiation image of the patient are proposed (for example, see patent document 1).
However, there are also medical staff who are present in the medical field as with the patient and who perform the interventional procedure. Therefore, protection of medical personnel is also beginning to be valued.
As a method for protecting medical staff, a method of displaying a spatial distribution of an amount of radiation in a room and a position where the medical staff is located during angiography on a display in order to improve vigilance of the medical staff (for example, see patent document 2), and a method of detecting an entire dose rate of an individual using a dose sensor (for example, see patent document 3) have been proposed.
However, the above method has a problem that organs such as eyes and thyroid of medical staff are sensitive to the amount of radiation, and the threshold set for these organs is lower than the overall threshold. Therefore, even if the total amount of radiation does not exceed the threshold, the organ may be exposed to radiation that exceeds its own safety threshold. Thus, merely displaying the location of medical personnel or estimating the overall dosage rate of an individual may not accurately account for the risk of being irradiated.
In contrast, patent document 4 mentions that the amount of radiation is analyzed for an important organ. However, in patent document 4, the spatial distribution of the radiation amount is not measured in real time, but a spatial distribution model of the radiation amount stored in advance is retrieved from a database, and the radiation amount of each organ is calculated based on the spatial distribution model of the radiation amount stored in advance.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and provides an absorbed radiation amount management apparatus and an absorbed radiation amount management method that can display the amount of radiation that each vital organ receives while a medical staff is operating a radiographic image diagnostic apparatus, and that can guide the medical staff to reduce the amount of radiation based on imaging conditions of the radiographic image diagnostic apparatus and the like.
An absorbed radiation amount management device according to an aspect includes: a radiation amount spatial distribution information acquisition unit that acquires information relating to a radiation amount spatial distribution calculated based on imaging conditions corresponding to imaging performed by the radiographic image diagnostic device; a position information acquiring unit that acquires position information of a part of a medical staff near the radiographic image diagnostic apparatus in the radiation dose spatial distribution; a radiation amount information acquiring unit that acquires information relating to an amount of radiation received by the part, based on the positional information; and a display control unit that controls the display unit to display information relating to the radiation amount.
With the above configuration, the spatial distribution of the radiation dose can be calculated in real time based on the imaging conditions corresponding to the diagnostic process performed by the radiographic image diagnostic apparatus, such as the scan parameters, the body size and the body position of the patient, the radiation dose to which the vital organ of the medical staff is exposed can be specified according to the specific position of the vital organ in the spatial distribution, and the radiation dose can be displayed on the display, so that the medical staff can grasp the radiation exposure level of the vital organ of the medical staff in time during the operation of the radiographic image diagnostic apparatus, thereby managing the radiation dose for the vital organ. The radiation quantity of the specific organ can be measured and displayed in real time, so that medical personnel can intuitively feel and remind the medical personnel, and the specific organ is prevented from being influenced by excessive radiation.
In the radiation absorption amount management device, the position information acquisition unit may acquire position information of the part of the medical staff in the radiation amount spatial distribution based on posture information of the medical staff in the radiation amount spatial distribution.
In the absorbed radiation dose management apparatus, the position information acquisition unit may acquire posture information of the spatial distribution of the radiation dose of the medical staff by a motion detection mechanism, and acquire position information of the part of the medical staff in the spatial distribution of the radiation dose based on the posture information.
In the radiation absorption amount management device, the position information acquisition unit may further acquire position information of a part of the medical staff in the radiation amount spatial distribution based on anatomical position information corresponding to the medical staff.
In the radiation absorption amount management device, the position information acquisition unit may track the medical staff moving during the examination to acquire the position information of the medical staff.
The radiation absorption amount management device may further include a guidance information output unit that provides guidance information to the medical staff based on imaging conditions before the start of imaging, thereby reducing or avoiding the amount of absorbed radiation.
With the above configuration, it is possible to provide guidance information such as changing a station, wearing a protector, and the like to the medical staff in accordance with imaging conditions such as scan parameters in an input scan protocol before radiation is released, and it is possible to effectively avoid or reduce the radiation amount of radiation received by the medical staff during an interventional operation.
In the radiation absorption amount management apparatus, the imaging conditions may include scan parameters and information on a patient.
With the above configuration, guidance information can be provided to medical staff while comprehensively considering the scan parameters and patient information relating to the body shape, body position, and the like of the patient.
The absorption radiation amount management device may further include a correction unit that corrects the radiation amount spatial distribution based on a correction factor obtained by the imaging unit, the correction factor including at least one of information relating to a medical staff and information relating to a patient.
With the above configuration, the spatial distribution of the radiation dose can be corrected in real time based on the information on the medical staff and the patient obtained by the camera, for example, the number of the medical staff, the relative positional relationship of the medical staff with respect to the X-ray emitter, the use condition of the medical staff's protective equipment, the body type of the patient, and other environmental information, and the radiation dose of the radiation to which the specific organ has been subjected can be obtained more accurately than in the case where the correction model is simply called from the database in the related art.
The radiation absorption amount management device may further include an alarm unit that generates an alarm by displaying or presenting an alarm by sound on the display unit when the amount of radiation received after the start of the imaging exceeds a predetermined threshold. In the absorbed radiation amount management apparatus, the guidance information output unit may output the guidance information when the amount of radiation received after the start of the imaging exceeds a preset threshold.
Through the structure, whether the radiation quantity received by the medical staff exceeds the preset safety range can be judged, and the medical staff can be reminded when the radiation quantity exceeds the safety range, so that the medical staff can play a role in reminding even if the medical staff neglects the management of the radiation quantity. When the amount of radiation received exceeds the safe range, the guidance information output by the guidance information output unit may be guidance information having the same level of protection as the initial guidance information output before the start of shooting, or guidance information subsequent to the initial guidance information and having a higher level of protection than the initial guidance information.
In the absorbed radiation dose management apparatus, the display unit may display a cumulative radiation dose of the plurality of vital organs in each operation. The display unit may display the guidance information provided to the medical staff. The display unit may highlight the detected vital organ based on a detection result of the position detection. The display unit may display the real-time spatial distribution of the radiation amount and the position of the medical staff with the vital organs highlighted on the plurality of image data, and guide the medical staff to a safe working position.
With the above configuration, by highlighting the vital organs and the cumulative radiation amount received by the vital organs, it is possible to quickly grasp the magnitude of the radiation amount received by each of the vital organs, and to take preventive measures with pertinence.
The radiation absorption amount management device may further include a storage unit that stores a plurality of pieces of image information related to movement of the medical staff. The storage unit stores the image related to the movement of the medical staff captured by the imaging unit, and the stored dynamic information related to the medical staff can be displayed on the display unit in combination with the spatial distribution of the radiation amount.
The radiation absorption amount management device may further include: a radiation amount simulation unit that generates a three-dimensional simulation diagram of spatial distribution of the amount of radiation in the room; a storage unit that stores moving image data relating to the movement of the medical staff and the amount of radiation received by the part; and a video stream generating unit that generates a video stream in which the moving image data and the three-dimensional simulation diagram are combined.
During the scanning by the radiographic image diagnostic apparatus, the entire operation procedure in the room is captured by the camera, the captured moving image concerning the movement of the medical staff is stored, the medical staff as the target object is extracted from the moving image, the radiation dose of the specific organ calculated by the radiation dose information acquiring unit is applied to the extracted moving image, and then the position of the medical staff and the radiation dose received by the organ are displayed on the three-dimensional simulated view of the radiation dose. Through the structure, not only can medical staff visually see the cross relation between each important organ and the radiation volume space distribution information and the radiation volume received by each important organ in the interventional operation process, thereby improving the safety awareness of the medical staff to the medical staff, but also can use the generated video stream for safety training after the operation.
In the radiation absorption amount management apparatus, the display unit may display the video stream so as to guide the medical staff to a safe position.
With the above configuration, medical staff involved in a surgery or inexperienced staff attending training can select a safe position based on the display of the display unit.
The technical scheme relates to a radiation absorption management method which comprises the following steps: a radiation amount spatial distribution information acquisition step of acquiring information on a radiation amount spatial distribution calculated based on imaging conditions corresponding to imaging performed by the radiographic image diagnostic apparatus; a position information acquisition step of acquiring position information of a part of a medical staff around the radiographic image diagnostic apparatus in the radiation dose spatial distribution; a radiation amount information acquisition step of acquiring information relating to the amount of radiation received by the part based on the positional information; and a display control step of controlling the display unit to display information relating to the radiation amount.
Drawings
Fig. 1 is a schematic diagram showing an absorbed radiation amount management system including an absorbed radiation amount management device according to
Fig. 2 is a schematic diagram showing the amount of radiation of the medical staff displayed on the display unit.
Fig. 3 is a flowchart showing a management flow of the absorbed radiation amount management apparatus according to
FIG. 4 illustrates a method of capturing gesture information of a moving object by loading a model to capture a motion trajectory.
Fig. 5 is a schematic diagram showing an absorbed radiation amount management system including an absorbed radiation amount management device according to
Fig. 6 is a schematic diagram showing an absorbed radiation amount management system including an absorbed radiation amount management device according to embodiment 3 of the present invention.
Fig. 7A schematically shows a moving image stored in the storage unit according to embodiment 3 of the present invention. Fig. 7B is a diagram showing a video stream generated by the video stream generating unit according to embodiment 3 of the present invention.
Fig. 8 is a schematic diagram showing the simultaneous display of the amount of radiation to which an important organ is subjected and the video stream generated by the video stream generating section.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings. The embodiments described in the present invention are merely examples, and are not limited to the configurations described in the embodiments.
In the following embodiments, a case where X-rays are emitted during an interventional operation is described as an example, and the present invention can be applied to, for example, cardiac angiography and treatment, imaging of the digestive system, joint imaging, biopsy, and the like. However, the above description is merely exemplary and is not intended to limit the scope of the present invention. The present invention is intended to cover any medical staff who may be affected by radiation.
(embodiment mode 1)
Fig. 1 is a schematic diagram showing an absorbed radiation amount management system including an absorbed radiation amount management device according to
As shown in fig. 1, the absorbed radiation amount management system 1000 includes a radiographic imaging device (radiographic image diagnostic device) 200 that images a patient, and an absorbed radiation
As the configuration of the
The
The
The absorbed radiation
The positional
The radiation dose
The
Fig. 2 is a schematic diagram showing the amount of radiation of the medical staff displayed on the display unit. In the present embodiment, the position
In fig. 2, the parts marked with the patterns represent vital organs of medical staff. The right pattern mark indicates the intensity of the radiation from the top to the bottom, and different patterns are used as marks in fig. 2 for convenience of explanation, and actually, the colors can be indicated from dark to light in order to make the medical staff clearly know the intensity of the radiation received by the staff. The right-hand medical staff (sector 1) is closer to the operating table in the figure and therefore receives more radiation than the left-hand medical staff (sector 2). By displaying the radiation amount of an important organ on a display unit such as a display in real time during the operation, medical staff can be given sufficient attention to avoid or reduce the radiation amount.
The absorbed radiation
The guidance
In addition to the above-described scan parameters, the guidance
The database is created by an expert based on past historical data. When the database is manufactured, the expert screens out the scanning parameters which have great influence on the received radiation amount from the plurality of scanning parameters and stores the scanning parameters as labels. In addition, the database stores a correspondence table in which scanning parameters (labels) that have a large influence on the amount of radiation received are associated with guidance information that can reduce or avoid the amount of radiation, and a guidance information label in which the labels and the guidance information are matched and combined one by one.
In addition to the scan parameters, the database may also store the patient information as a label, store the correspondence between the patient information and the guidance information as a label, and create a corresponding guidance information label.
For example, when the scan parameter set by the scan
The
The absorbed radiation
Next, a management flow of the radiation absorption amount management device according to the present embodiment will be described with reference to fig. 3.
First, in step S101, a user, i.e., a medical staff, selects a desired scan protocol according to an examination item, and specifies scan parameters corresponding to the scan protocol, which may be initial scan parameters defined in advance or adjusted by the user according to actual conditions, for example, the body type of a patient, and the adjusted scan parameters are stored in a storage unit, not shown. The scan parameter mentioned above may include a name of the scan parameter and a numerical size of the scan parameter, and is abbreviated herein as the scan parameter for convenience of description.
Next, in step S102, after the scan parameter specified in step S101 is input to the guidance
The scan parameters described in the correspondence table may be scan parameters of a part or all of the scan protocols selected by the user, the scan parameters being scan parameters that are selected by experts based on past historical data and easily affect vital organs of the user (medical staff), and each scan parameter corresponds to at least one guidance information that can avoid or reduce the amount of radiation. In addition, each scan parameter may also correspond to a determination criterion in the correspondence table, and when the scan parameter satisfies the determination criterion, the scan parameter may be presented to the user (medical staff) together with the corresponding guidance information.
TABLE 1
Table 1 lists several parameters that are susceptible to radiation effects on vital organs, including mainly: c-arm angle, special scanning procedures (DSA, etc.), time, patient size, and patient position. When the C-arm is used, because the radiation received by the medical staff is mainly from the scattering of the X-ray of the patient, the information user can be guided to stand on the detector side away from the X-ray generator side and lead protection is used according to the rotation angle of the C-arm, and when DSA (digital subtraction angiography) is included in the operation, because the radiation intensity near the operation table is high, the information user can be guided to move one step away from the operation table, and when the operation time is longer, the information user can be guided to use the lead protection, in addition, the radiation of the medical staff is mainly from the scattering of the X-ray of the patient, if the size of the patient is larger, the radiation received by the medical staff is larger, so the information medical staff can be guided to be away from the operation table or use the lead protection as far as possible according to the size of the patient, and if the operation has special requirements on the body position of the patient, the radiation received by the medical staff is also influenced by the difference of the standing positions of the medical staff, so that the information medical staff can be guided to stand at the position with less radiation as much as possible according to the body position of the patient.
In the above description, only a part of the guidance information is listed, and the actual guidance information is not limited to the above example, and other protection methods such as protective glasses, protective vests, and the like may be adopted as necessary.
Next, the procedure of selecting the guidance information will be described by taking the scanning parameters shown in table 1 as an example.
For example, when a plurality of scanning parameters of the scanning protocol include a scanning parameter related to the rotation angle of the C-arm, a tag meeting the conditions is searched in a database in which a plurality of kinds of guiding information are already stored, and if the tag meeting the conditions is found, the guiding information corresponding to the tag is extracted, and "far away from the x-ray generator side, standing on the detector side and using lead protection" is suggested to medical staff, for example, "XX degrees of the C-arm angle: please leave the x-ray generator side, stand on the detector side and use lead shielding "as a guide information label.
For example, when a special scanning procedure as a scanning parameter is included in a plurality of scanning parameters of the scanning protocol, DSA is included in the plurality of scanning parameters, it is determined whether or not the scanning parameter meets a determination criterion in the correspondence table, and if the determination criterion is met, the "one-step movement in a direction away from the operating table" information is guided to the medical staff, and for example, "the special scanning procedure DSA: please move one step away from the operating table "as a guiding information label.
The guidance information labels are selected in the same manner for other scanning parameters, and a repetitive description thereof is omitted here.
Although the case where step S102 is executed after step S101 has been described above, the operation of step S102 may not be performed and the scanning may be started directly before the radiographic image diagnostic apparatus performs imaging (step S103). Although the guidance information cannot be obtained in advance, medical staff can adopt different corresponding methods according to the degree of radiation of the important organ obtained in real time in the subsequent step, so that the aim of managing the radiation quantity can be fulfilled.
In step S103, after the scanning is started, the process proceeds to step S104.
In step S104, first, the movement of the medical staff in the operating room, for example, the operating room is imaged by a plurality of cameras installed indoors, and a plurality of moving images relating to the movement of the medical staff are stored. Then, the position of the medical staff in the operating room is recognized from the plurality of stored dynamic images by the motion detection means by the motion capture method in the related art, and the position information of the medical staff is obtained.
In step S104, the posture and position of the medical staff may be recognized by the plurality of cameras to determine the number of medical staff and the position of the medical staff relative to the X-ray emitter (for example, the medical staff is facing the X-ray emitter, the medical staff is facing away from the X-ray emitter, or the medical staff is present in the operating room and the relative positions of the plurality of medical staff and the X-ray emitter), and the spatial distribution of the dose, which will be described later, may be corrected based on the recognition result.
Fig. 4 shows a method for capturing posture information of a moving object by loading a model to capture a motion trajectory, for example, loading a human body model, setting constraints on the model and the motion, wherein the constraints can be a plurality of points related to joints of the human body, and tracking the points to capture the overall motion trajectory. However, this method is only an example, and is not limited thereto, and other methods may be used as long as the object of the present invention can be achieved.
In step S105, the radiation dose spatial distribution
Next, in step S106, the radiation dose
Then, in step S107, the radiation level risk determination unit determines whether or not the radiation level received by the vital organ exceeds a predetermined threshold. If the threshold value is exceeded, the process proceeds to step S108, and after providing the medical staff with the warning or guidance information, the process returns to step S106, and the information on the amount of radiation to which the vital organ is exposed is continuously displayed. If the threshold is not exceeded, the process returns to step S106. The radiation amount risk judging unit is a part of the absorbed radiation
By executing the steps S101, S103 to S106 of the present embodiment, it is possible to display the positional information of the vital organs of the medical staff in the spatial distribution of the radiation amount and the information on the radiation amount received by the vital organs in real time, and therefore, the calculation result of the radiation amount is more realistic and accurate than the case of using the radiation amount spatial distribution model, and further, the subject of the present embodiment is the vital organs of the human body, and therefore, it is possible to allow the medical staff to manage the radiation amount received by each part of the medical staff more specifically than the case of managing the radiation amount for the entire human body.
Step S102 is a preferable step in the present embodiment, and guidance information can be provided to medical staff in advance before the start of scanning, thereby reducing the possibility of exposure to radiation.
Steps S107 and S108 are also preferable steps in the present embodiment. By executing steps S107 and S108 of the present embodiment, it is possible to determine whether the radiation level reaches a dangerous level during the scanning process, and if there is a possibility of damage to an important organ, further provide an alarm and/or guidance information to avoid the radiation level exceeding the standard.
In the present embodiment, the medical staff can see the radiation amount of the body organ on the display or the like as the display unit while performing the operation, and can obtain guidance information for reducing the radiation amount on the display before and after the start of the scanning and when the radiation amount exceeds the threshold value, thereby making it possible to manage the absorbed radiation amount favorably.
(embodiment mode 2)
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