CN108013885B - Radioscopy apparatus - Google Patents
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- CN108013885B CN108013885B CN201610927350.1A CN201610927350A CN108013885B CN 108013885 B CN108013885 B CN 108013885B CN 201610927350 A CN201610927350 A CN 201610927350A CN 108013885 B CN108013885 B CN 108013885B
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- 238000003384 imaging method Methods 0.000 claims abstract description 296
- 239000003550 marker Substances 0.000 claims abstract description 63
- 230000005855 radiation Effects 0.000 claims abstract description 60
- 238000001514 detection method Methods 0.000 claims abstract description 58
- 238000002594 fluoroscopy Methods 0.000 abstract description 86
- 238000001959 radiotherapy Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000001678 irradiating effect Effects 0.000 description 6
- 206010028980 Neoplasm Diseases 0.000 description 5
- 238000005338 heat storage Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 230000001225 therapeutic effect Effects 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4021—Arrangements for generating radiation specially adapted for radiation diagnosis involving movement of the focal spot
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
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Abstract
Provided is a radioscopy apparatus capable of performing radioscopy from three or more positions without moving a radiation irradiation unit and a radiation detector. The control unit (30) is provided with: a detection rate calculation unit (32) that calculates the detection rates of the positions of the markers by a first imaging system that includes a first X-ray tube (11) and a first flat panel detector (21), by a second imaging system that includes a second X-ray tube (12) and a second flat panel detector (22), by a third imaging system that includes a third X-ray tube (13) and a third flat panel detector (23), and by a fourth imaging system that includes a fourth X-ray tube (14) and a fourth flat panel detector (24), respectively; an imaging system selection unit (33) selects two imaging systems for X-ray fluoroscopy from among the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system based on the detection rate of the position of the marker calculated by the detection rate calculation unit (32).
Description
Technical Field
The present invention relates to a fluoroscopy apparatus such as an X-ray fluoroscopy apparatus that acquires an image including a marker left in a body of a subject or an image including a specific part of the subject from two directions different from each other, and detects a position of the marker or the specific part moving along with a body movement of the subject.
Background
In a radiotherapy apparatus including a head for irradiating a treatment beam and a gantry for rotating the head around a subject to perform radiotherapy by irradiating a treatment beam such as an X-ray or an electron beam to an affected part such as a tumor, it is necessary to accurately irradiate the affected part with radiation. However, not only the subject moves his body, but also the affected part itself moves. For example, a tumor in the vicinity of the lung moves largely due to respiration. Therefore, patent document 1 proposes a radiotherapy apparatus having the following structure: gold markers are arranged near the tumor, and the positions of the markers are detected by an X-ray fluoroscopy device to control the irradiation of the therapeutic radiation.
As such a radiotherapy apparatus, patent document 2 discloses an X-ray fluoroscopy apparatus for specifying a position of a marker by performing fluoroscopy on an image including the marker left in a body of a subject. In the X-ray fluoroscopy apparatus described in patent document 2, the marker embedded in the body is detected by template matching or the like using a first imaging system including a first X-ray tube for irradiating X-rays from the floor side and a first X-ray detector for detecting X-rays having passed through the subject from the ceiling side and a second imaging system including a second X-ray tube for irradiating X-rays from the floor side and a second X-ray detector for detecting X-rays having passed through the subject from the ceiling side. Then, three-dimensional position information is obtained using the two-dimensional fluoroscopic image captured by the first imaging system and the two-dimensional fluoroscopic image captured by the second imaging system. By continuously performing such an operation and calculating the three-dimensional position information of the marker in real time, the marker of the part accompanied by movement is detected with high accuracy. Further, by controlling the irradiation of the therapeutic radiation based on the position information of the marker, it is possible to perform high-precision radiation irradiation according to the movement of the tumor.
In this case, since the treatment beam needs to be irradiated toward the affected part from various directions depending on the position of the affected part of the subject, the head for irradiating the treatment beam can be rotated around the subject as described above. Therefore, in the X-ray fluoroscopy apparatus described in patent document 2, the first imaging system and the second imaging system need to perform fluoroscopy from a position where X-rays are not blocked by the head. In order to enable this operation, in the fluoroscopy apparatus described in patent document 2, the first X-ray tube, the first X-ray detector, the second X-ray tube, and the second X-ray detector are configured to be movable along the rail, so that fluoroscopy can be performed from three predetermined positions.
Patent document 1: japanese patent laid-open No. 2000-167072
Patent document 2: japanese patent laid-open No. 2014-128412
Disclosure of Invention
Problems to be solved by the invention
The X-ray fluoroscopy apparatus described in patent document 2 has an advantage in that X-ray fluoroscopy can be performed from a plurality of positions on a subject by using the first imaging system and the second imaging system each including the X-ray tube and the X-ray detector, but a moving mechanism for moving the X-ray tube and the X-ray detector is required.
The present invention has been made to solve the above-described problems, and a first object of the present invention is to provide a radioscopy apparatus capable of performing radioscopy from three or more positions without moving a radiation irradiation unit and a radiation detector.
In this case, the accuracy of detecting the marker or the specific portion that moves in accordance with the body motion of the subject may be reduced based on the position and direction of the affected part of the subject or the movement state of the affected part. Therefore, a second object of the present invention is to provide a radioscopy apparatus capable of improving the detection accuracy of a marker or a specific portion.
When radiation is continuously irradiated from the radiation irradiation unit to perform radioscopy and heat equal to or greater than a predetermined value is accumulated in the radiation irradiation unit, the irradiation of radiation needs to be temporarily stopped to cool the radiation irradiation unit. Therefore, a third object of the present invention is to provide a radioscopy apparatus capable of efficiently using a radiation irradiation section.
Means for solving the problems
The first invention is a radioscopy apparatus comprising: the radioscopy apparatus is provided with three or more imaging systems, each imaging system having a radiation irradiation unit and a radiation detector that detects radiation irradiated from the radiation irradiation unit and transmitted through a subject, and an imaging system selection unit that selects two imaging systems for radioscopy among the three or more imaging systems.
In the second aspect of the invention, the imaging system selection unit selects two imaging systems for use in fluoroscopy based on the detection rates of the positions of the marker or the specific portion calculated by the detection rate calculation unit.
In the third aspect of the invention, the imaging system selection unit selects two imaging systems for radioscopy based on the stored heat amounts of the radiation irradiation units calculated by the stored heat amount calculation unit.
The fourth invention is a radioscopy apparatus comprising: a radioscopy apparatus for detecting the position of a marker or a specific part of a subject moving along with the body movement of the subject by acquiring an image including the marker left in the subject or an image including the specific part of the subject from two directions different from each other, the radioscopy apparatus comprising: a first imaging system, a second imaging system, a third imaging system, and a fourth imaging system each having a radiation irradiation portion and a radiation detector that detects radiation irradiated from the radiation irradiation portion and transmitted through the subject; a first power supply unit configured to supply power to the radiation irradiation unit in the first imaging system and the second imaging system; a second power supply unit configured to supply power to the radiation irradiation unit in the third imaging system and the fourth imaging system; and an imaging system selection unit that selects one of the first imaging system and the second imaging system and one of the third imaging system and the fourth imaging system as an imaging system for radioscopy.
In the fifth aspect of the invention, the imaging system selection unit selects an imaging system having a high detection rate of the position of the marker or the specific portion calculated by the detection rate calculation unit from among the first imaging system and the second imaging system, and selects an imaging system having a high detection rate of the position of the marker or the specific portion calculated by the detection rate calculation unit from among the third imaging system and the fourth imaging system.
In the sixth aspect of the invention, the imaging system selection unit selects an imaging system having a small stored heat amount of the radiation irradiation unit calculated by the stored heat amount calculation unit from among the first imaging system and the second imaging system, and selects an imaging system having a small stored heat amount of the radiation irradiation unit calculated by the stored heat amount calculation unit from among the third imaging system and the fourth imaging system.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the first aspect of the invention, the operation of the imaging system selection unit that selects two imaging systems for radioscopy among three or more imaging systems enables radioscopy to be performed from three or more positions without moving the radiation irradiation unit and the radiation detector.
According to the second aspect of the invention, since the two imaging systems for radioscopy are selected based on the detection rate of the position of the marker or the specific portion calculated by the detection rate calculation unit, the detection accuracy of the marker or the specific portion can be improved.
According to the third aspect of the present invention, since the two imaging systems for radioscopy are selected based on the stored heat amount of the radiation irradiation portion calculated by the stored heat amount calculation portion, the radiation irradiation portion having a small stored heat amount can be selected and used efficiently.
According to the fourth aspect of the invention, by selecting one of the first imaging system and the second imaging system and one of the third imaging system and the fourth imaging system to function as the imaging system selection unit of the imaging system for radioscopy, radioscopy can be performed from four positions without moving the radiation irradiation unit and the radiation detector. Further, since the power supply sections, which are a pair of the first power supply section for supplying power to the radiation irradiation sections in the first imaging system and the second power supply section for supplying power to the radiation irradiation sections in the third imaging system and the fourth imaging system, can supply power to the radiation irradiation sections in the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system, the number of power supply sections can be reduced by half, and the manufacturing cost of the apparatus can be reduced.
According to the fifth aspect of the invention, the imaging system having the high detection rate of the position of the mark or the specific portion calculated by the detection rate calculating unit is selected from the first imaging system and the second imaging system, and the imaging system having the high detection rate of the position of the mark or the specific portion calculated by the detection rate calculating unit is selected from the third imaging system and the fourth imaging system.
According to the sixth aspect of the invention, the imaging system in which the stored heat amount of the radiation irradiation unit calculated by the stored heat amount calculating unit is small is selected from the first imaging system and the second imaging system, and the imaging system in which the stored heat amount of the radiation irradiation unit calculated by the stored heat amount calculating unit is small is selected from the third imaging system and the fourth imaging system.
Drawings
Fig. 1 is a schematic diagram of an X-ray fluoroscopy apparatus as a radioscopy apparatus according to the present invention.
Fig. 2 is a block diagram showing a control system of the fluoroscopy apparatus according to the first embodiment of the present invention.
Fig. 3 is a flowchart showing an operation until two imaging systems for fluoroscopy are selected and fluoroscopy is started in the fluoroscopy apparatus according to the first embodiment of the present invention.
Fig. 4 is a block diagram showing a control system of an X-ray fluoroscopic apparatus according to a second embodiment of the present invention.
Fig. 5 is a flowchart showing an operation until two imaging systems for fluoroscopy are selected and fluoroscopy is started in the fluoroscopy apparatus according to the second embodiment of the present invention.
Description of the reference numerals
10: a subject to be examined; 11: a first X-ray tube; 12: a second X-ray tube; 13: a third X-ray tube; 14: a fourth X-ray tube; 19: a mounting table; 21: a first flat panel detector; 22: a second flat panel detector; 23: a third flat panel detector; 24: a fourth flat panel detector; 28: a first power supply unit; 29: a second power supply unit; 30: a control unit; 31: a mark detection unit; 32: a detection rate calculation unit; 33: a photographing system selection unit; 34: a stored heat amount calculation unit.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a schematic diagram of an X-ray fluoroscopy apparatus as a radioscopy apparatus according to the present invention. Fig. 2 is a block diagram showing a control system of the X-ray fluoroscopy apparatus according to the first embodiment of the present invention.
The X-ray fluoroscopy apparatus is used together with a radiotherapy apparatus for performing radiotherapy by irradiating a diseased part of the subject 10 on the table 19 with radiation such as X-rays and electron beams. In such radiotherapy, it is necessary to accurately irradiate the affected part moving along with the body movement of the subject 10 with radiation. Therefore, a marker is provided near the affected part of the subject 10. Then, the marker embedded in the body of the subject 10 is continuously fluoroscopic by X-ray fluoroscopy, and three-dimensional position information of the marker is calculated, thereby performing so-called moving object tracking in which the marker is detected with high accuracy. Further, there are also cases where: instead of providing a marker near the affected part of the subject 10, label-free tracking using an image of a specific part of the subject 10 such as a tumor instead of the marker is employed.
The X-ray fluoroscopy apparatus includes a first X-ray tube 11, a second X-ray tube 12, a third X-ray tube 13, and a fourth X-ray tube 14 that function as the radiation irradiation unit according to the present invention, and a first flat panel detector 21, a second flat panel detector 22, a third flat panel detector 23, and a fourth flat panel detector 24 that function as the radiation detector according to the present invention. X-rays as radiation emitted from the first X-ray tube 11 are transmitted through the subject 10 on the table 19 and then detected by the first flat panel detector 21. The first X-ray tube 11 and the first flat panel detector 21 constitute a first imaging system according to the present invention. The X-rays emitted from the second X-ray tube 12 are transmitted through the subject 10 on the table 19 and then detected by the second flat panel detector 22. The second X-ray tube 12 and the second flat panel detector 22 constitute a second imaging system according to the present invention. The X-rays emitted from the third X-ray tube 13 are transmitted through the subject 10 on the table 19 and then detected by the third flat panel detector 23. The third X-ray tube 13 and the third flat panel detector 23 constitute a third imaging system according to the present invention. The X-rays emitted from the fourth X-ray tube 14 are transmitted through the subject 10 on the table 19 and then detected by the fourth flat panel detector 24. The fourth X-ray tube 14 and the fourth flat panel detector 24 constitute a fourth imaging system according to the present invention.
The fluoroscopy apparatus further includes a first power supply unit 28 and a second power supply unit 29. These first power supply section 28 and second power supply section 29 are also referred to as high-voltage devices. The first power supply unit 28 selectively supplies a tube voltage and a tube current necessary for X-ray irradiation to the first X-ray tube 11 or the second X-ray tube 12. The second power supply unit 29 selectively supplies a tube voltage and a tube current necessary for X-ray irradiation to the third X-ray tube 13 or the fourth X-ray tube 14.
Therefore, the first X-ray tube 11 and the second X-ray tube 12 cannot simultaneously irradiate X-rays, and the third X-ray tube 13 and the fourth X-ray tube 14 cannot simultaneously irradiate X-rays. Therefore, the first and second imaging systems cannot be used at the same time, and the third and fourth imaging systems cannot be used at the same time. On the other hand, in the moving object tracking, in order to calculate three-dimensional position information of a marker or a specific portion (hereinafter, these are collectively referred to as "marker"), it is necessary to see through the marker from two directions. Therefore, in the fluoroscopy apparatus, it is possible to perform fluoroscopy in four modes of fluoroscopy at a first position using the first imaging system and the third imaging system, fluoroscopy at a second position using the first imaging system and the fourth imaging system, fluoroscopy at a third position using the second imaging system and the third imaging system, and fluoroscopy at a fourth position using the second imaging system and the fourth imaging system.
The fluoroscopy apparatus further includes a control unit 30, and the control unit 30 includes a CPU that executes logical operations, a ROM that stores operation programs necessary for the control apparatus, a RAM that temporarily stores data and the like during control, and the like, and is used for controlling the entire apparatus. The control unit 30 is connected to the first flat panel detector 21, the second flat panel detector 22, the third flat panel detector 23, and the fourth flat panel detector 24. The control unit 30 is connected to the first power supply unit 28 and the second power supply unit 29.
The control unit 30 includes a mark detection unit 31, and the mark detection unit 31 detects a mark using two imaging systems of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system. The marker detection unit 31 calculates three-dimensional position information of the marker by, for example, template matching that compares an image including the marker left in the body of the subject 10 captured by the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system with a preset template image. The control unit 30 further includes a detection rate calculation unit 32 and an imaging system selection unit 33, wherein the detection rate calculation unit 32 calculates detection rates of the positions of the markers by the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system, respectively, as will be described later, and the imaging system selection unit 33 selects two imaging systems for X-ray fluoroscopy among the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system based on the detection rate of the position of the marker calculated by the detection rate calculation unit 32.
Next, an operation until the two imaging systems for fluoroscopy are selected by the fluoroscopy apparatus and fluoroscopy is started will be described. Fig. 3 is a flowchart showing an operation until two imaging systems for fluoroscopy are selected and fluoroscopy is started in the fluoroscopy apparatus according to the first embodiment of the present invention.
When the X-ray fluoroscopy is executed, one of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system is first designated (step S11). In this case, any one of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system may be selected and designated, or one of the imaging systems used in the immediately preceding X-ray fluoroscopy may be selected. The selection of the imaging system is automatically performed by the control unit 30. However, the operator may also perform the selection manually.
Next, an image including a marker left in the body of the subject 10 is acquired at a frame rate of about 20 to 30fps using the selected imaging system (step S12). Then, the marker placed inside the body of the subject 10 is detected by the marker detecting unit 31 shown in fig. 2 using the plurality of acquired images (step S13). For example, template matching is used for detection of the marker.
Next, the detection rate calculating unit 32 shown in fig. 2 calculates the detection rate of the position of the marker when the marker is detected by using the selected imaging system (step S14).
That is, the detection rate of the marker greatly differs depending on the direction in which the marker is subjected to fluoroscopy, based on conditions such as the position and direction of the subject 10 during fluoroscopy, and the movement of the marker accompanying the breathing of the subject 10. For example, in the case of using a mark having a linear shape, it is difficult to recognize the mark even if the mark is subjected to X-ray fluoroscopy from the axial direction of the mark. In addition, when the marker overlaps the bone portion with respect to the X-ray fluoroscopy direction, it is difficult to recognize the marker if a high dose of X-rays is not used. Therefore, the detection rates of the positions of the marks of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system are different from each other. Therefore, the X-ray fluoroscopy apparatus according to the first embodiment employs a configuration in which the detection rate of the position of the marker is calculated in advance. Two imaging systems for X-ray fluoroscopy are selected from the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system based on the calculated value of the detection rate.
In the detection rate calculating step, the detection rate of the position of the marker can be set to a ratio of images in which the marker can be detected in the marker detecting step (step S13) among the plurality of images acquired in the marker image acquiring step (step S12). However, in the case of detecting a marker by pattern matching or the like, the detection rate of the position of the marker may be calculated based on the matching rate of the pattern. Further, the detection rate of the position of the mark may be calculated using both the scale of the image in which the mark can be detected and the matching rate of the pattern.
The above operations are executed for the first, second, third, and fourth photographing systems (step S15). If the detection rates of the positions of the markers are calculated for all the imaging systems of the first, second, third, and fourth imaging systems (step S15), two imaging systems for X-ray fluoroscopy are selected from the first, second, third, and fourth imaging systems (step S16).
When this imaging system is selected, the first imaging system and the second imaging system cannot be used at the same time, and the third imaging system and the fourth imaging system cannot be used at the same time, as described above, and therefore, the imaging system having a higher detection rate of the position of the marker is selected in the first imaging system and the second imaging system, and the imaging system having a higher detection rate of the position of the marker is selected in the third imaging system and the fourth imaging system. This makes it possible to select any one of four modes, i.e., X-ray fluoroscopy at a first position using the first imaging system and the third imaging system, X-ray fluoroscopy at a second position using the first imaging system and the fourth imaging system, X-ray fluoroscopy at a third position using the second imaging system and the third imaging system, and X-ray fluoroscopy at a fourth position using the second imaging system and the fourth imaging system.
When two imaging systems for X-ray fluoroscopy are selected, X-ray fluoroscopy is started using these imaging systems (step S17). In this case, since two imaging systems having a high detection rate of the position of the marker are selected, X-ray fluoroscopy can be performed with high accuracy.
Next, another embodiment of the present invention will be described. Fig. 4 is a block diagram showing a control system of an X-ray fluoroscopic apparatus according to a second embodiment of the present invention. Note that the same members as those in the above embodiment are given the same reference numerals, and detailed description thereof is omitted.
In contrast to the X-ray fluoroscopy apparatus according to the first embodiment in which two imaging systems for X-ray fluoroscopy are selected among the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system based on the detection rate of the position of the marker calculated by the detection rate calculation unit 32, the X-ray fluoroscopy apparatus according to the second embodiment in which two imaging systems for X-ray fluoroscopy are selected among the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system based on the stored heat amount of the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14 calculated by the stored heat amount calculation unit 34.
That is, when X-ray fluoroscopy is continuously performed, heat is accumulated in the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14. When the amount of heat accumulated is not less than a fixed amount, the X-ray irradiation is stopped from the viewpoint of safety, and the X-ray irradiation is restricted before the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14 are cooled. In particular, when X-rays are irradiated at a high dose rate, the amount of heat accumulated in the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14 per unit time is larger than the amount of heat consumed for cooling the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14, so that the amount of heat accumulated increases, and X-ray fluoroscopy is restricted. Therefore, in the X-ray fluoroscopy apparatus according to the second embodiment, two imaging systems of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system are selected in consideration of the respective heat storage amounts of the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14.
As shown in fig. 4, the fluoroscopy apparatus according to the second embodiment includes a stored heat amount calculation unit 34 instead of the detection rate calculation unit 32 of the fluoroscopy apparatus according to the first embodiment. The stored heat amount calculation unit 34 has the following structure: the stored heat amount of the first X-ray tube 11 and the second X-ray tube 12 is calculated based on the tube voltage and the tube current applied to the first X-ray tube 11 and the second X-ray tube 12 by the first power supply portion 28 and the irradiation time of the X-rays irradiated from the first X-ray tube 11 and the second X-ray tube 12, and the stored heat amount of the third X-ray tube 13 and the fourth X-ray tube 14 is calculated based on the tube voltage and the tube current applied to the third X-ray tube 13 and the fourth X-ray tube 14 by the second power supply portion 29 and the irradiation time of the X-rays irradiated from the third X-ray tube 13 and the fourth X-ray tube 14.
Instead of calculating the stored heat amount from the tube current, the tube voltage, and the X-ray irradiation time, temperature sensors may be attached to the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14, respectively, and the stored heat amount of the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14 may be calculated from signals from the temperature sensors.
Next, an operation until two imaging systems for X-ray fluoroscopy are selected and X-ray fluoroscopy is started by the X-ray fluoroscopy apparatus according to the second embodiment will be described. Fig. 5 is a flowchart showing an operation until two imaging systems for fluoroscopy are selected and fluoroscopy is started in the fluoroscopy apparatus according to the second embodiment of the present invention.
In the case of performing X-ray fluoroscopy, one of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system is first designated (step S21), as in the case of the first embodiment.
Next, the stored heat amounts of the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14 are calculated (step S22). The above operations are executed for the first, second, third, and fourth photographing systems (step S23). If the stored heat amount of the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, or the fourth X-ray tube 14 is calculated for all the imaging systems of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system (step S23), it waits for a switch (not shown) for starting X-ray fluoroscopy to be pressed (step S24).
Then, if a switch for starting X-ray fluoroscopy is pressed (step S24), two imaging systems for X-ray fluoroscopy are selected from the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system (step S25).
When this imaging system is selected, the first imaging system and the second imaging system cannot be used at the same time, and the third imaging system and the fourth imaging system cannot be used at the same time, as described above, and therefore, an imaging system having a smaller heat storage amount of the X-ray tube is selected among the first imaging system and the second imaging system, and an imaging system having a smaller heat storage amount of the X-ray tube is selected among the third imaging system and the fourth imaging system. That is, the stored heat amount of the first X-ray tube 11 is compared with the stored heat amount of the second X-ray tube 12, and the first imaging system is selected when the stored heat amount of the first X-ray tube 11 is smaller, and the second imaging system is selected when the stored heat amount of the second X-ray tube 12 is smaller. Similarly, the stored heat amount of the third X-ray tube 13 is compared with the stored heat amount of the fourth X-ray tube 14, and the third imaging system is selected when the stored heat amount of the third X-ray tube 13 is smaller, and the fourth imaging system is selected when the stored heat amount of the fourth X-ray tube 14 is smaller. This makes it possible to select any one of four modes, i.e., X-ray fluoroscopy at a first position using the first imaging system and the third imaging system, X-ray fluoroscopy at a second position using the first imaging system and the fourth imaging system, X-ray fluoroscopy at a third position using the second imaging system and the third imaging system, and X-ray fluoroscopy at a fourth position using the second imaging system and the fourth imaging system.
After the selection process of selecting two imaging systems for X-ray fluoroscopy has been performed, X-ray fluoroscopy is started using these imaging systems (step S26). In this case, since two imaging systems having a smaller heat storage amount of the X-ray tube are selected, time for cooling the X-ray tube is not required, and the X-ray tube can be used more efficiently.
In the above embodiment, the imaging system includes four imaging systems, that is, the first imaging system including the first X-ray tube 11 and the first flat panel detector 21, the second imaging system including the second X-ray tube 12 and the second flat panel detector 22, the third imaging system including the third X-ray tube 13 and the third flat panel detector 23, and the fourth imaging system including the fourth X-ray tube 14 and the fourth flat panel detector 24. That is, any of the following structures may be used: the X-ray imaging apparatus includes three or more imaging systems each having an X-ray tube and a flat panel detector, and two imaging systems for X-ray fluoroscopy can be selected from the three or more imaging systems.
In the above embodiment, the following structure is adopted: the first power supply unit 28 selectively supplies a tube voltage and a tube current necessary for X-ray irradiation to the first X-ray tube 11 or the second X-ray tube 12, and the second power supply unit 29 selectively supplies a tube voltage and a tube current necessary for X-ray irradiation to the third X-ray tube 13 or the fourth X-ray tube 14. With this configuration, the number of power supply units can be reduced by half, and the manufacturing cost of the device can be reduced. However, the power supply unit may be provided for each of the first X-ray tube 11, the second X-ray tube 12, the third X-ray tube 13, and the fourth X-ray tube 14. In the case of adopting such a configuration, it is possible to select any two imaging systems from among the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system and perform X-ray fluoroscopy.
In the above-described embodiment, the imaging system is selected based on the detection rate of the position of the mark or the stored heat amount, but the imaging system may be selected based on both of them. In addition, when there is an imaging system that cannot be used due to a failure or the like, an imaging system for X-ray fluoroscopy may be selected without the imaging system.
Further, as the above-described embodiment, a flat panel detector is used as the X-ray detector functioning as a radiation detector according to the present invention, but an X-ray detector such as an image intensifier (I.I) or another radiation detector may be used.
Claims (6)
1. A radioscopy apparatus for detecting the position of a marker or a specific part of a subject moving with the body movement of the subject by acquiring images including the marker left in the subject or images including the specific part of the subject from two directions different from each other,
includes three or more imaging systems, each imaging system including a radiation irradiation section and a radiation detector for detecting radiation irradiated from the radiation irradiation section and transmitted through the subject,
and an imaging system selection unit for selecting two imaging systems for radioscopy from the three or more imaging systems, an
The imaging apparatus includes a detection unit that detects a position of a marker or a specific part of the subject that moves in accordance with body movement of the subject from an image including the marker or the specific part left in the subject acquired by radioscopy using the selected two imaging systems.
2. The radioscopy apparatus according to claim 1,
a detection rate calculation unit for calculating the detection rates of the three or more imaging systems for the positions of the marker or the specific portion,
the imaging system selection unit selects two imaging systems for radioscopy based on the detection rate of the position of the marker or the specific portion calculated by the detection rate calculation unit.
3. The radioscopy apparatus according to claim 1,
a stored heat calculation unit for calculating stored heat of the radiation irradiation unit in each of the three or more imaging systems,
the imaging system selection unit selects two imaging systems for radioscopy based on the stored heat amount of the radiation irradiation unit calculated by the stored heat amount calculation unit.
4. A radioscopy apparatus for detecting a position of a marker or a specific part of a subject moving along with a body movement of the subject by acquiring an image including the marker left in the subject or an image including the specific part of the subject from two directions different from each other, the radioscopy apparatus comprising:
a first imaging system, a second imaging system, a third imaging system, and a fourth imaging system each having a radiation irradiation portion and a radiation detector that detects radiation irradiated from the radiation irradiation portion and transmitted through the subject;
a first power supply unit configured to supply power to the radiation irradiation unit in the first imaging system and the second imaging system;
a second power supply unit configured to supply power to the radiation irradiation unit in the third imaging system and the fourth imaging system; and
and an imaging system selection unit that selects one of the first imaging system and the second imaging system and one of the third imaging system and the fourth imaging system as an imaging system for radioscopy.
5. The radioscopy apparatus according to claim 4,
a detection rate calculation unit that calculates detection rates of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system with respect to the position of the mark or the specific portion, respectively,
the imaging system selection unit selects an imaging system having a high detection rate of the position of the marker or the specific portion calculated by the detection rate calculation unit from among the first imaging system and the second imaging system, and selects an imaging system having a high detection rate of the position of the marker or the specific portion calculated by the detection rate calculation unit from among the third imaging system and the fourth imaging system.
6. The radioscopy apparatus according to claim 4,
a stored heat calculation unit that calculates stored heat amounts of the radiation irradiation unit in each of the first imaging system, the second imaging system, the third imaging system, and the fourth imaging system,
the imaging system selection unit selects an imaging system having a small stored heat amount of the radiation irradiator calculated by the stored heat amount calculation unit from among the first imaging system and the second imaging system, and selects an imaging system having a small stored heat amount of the radiation irradiator calculated by the stored heat amount calculation unit from among the third imaging system and the fourth imaging system.
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| CN201610927350.1A CN108013885B (en) | 2016-10-31 | 2016-10-31 | Radioscopy apparatus |
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| CN201610927350.1A CN108013885B (en) | 2016-10-31 | 2016-10-31 | Radioscopy apparatus |
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| US8891726B2 (en) * | 2008-02-14 | 2014-11-18 | Koninklijke Philips N.V. | Multiple-source imaging system with flat-panel detector |
| WO2009115982A1 (en) * | 2008-03-21 | 2009-09-24 | Koninklijke Philips Electronics N.V. | Computed tomography scanner apparatus and method for ct-based image acquisition based on spatially distributed x-ray microsources of the cone-beam type |
| JP5460106B2 (en) * | 2009-04-03 | 2014-04-02 | キヤノン株式会社 | X-ray imaging apparatus, control method therefor, and computer program |
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