X-ray diagnostic apparatus, x-ray diagnostic system, and method for controlling x-ray diagnostic apparatus

Abstract

To reduce a risk of developing embolism due to gas mix.SOLUTION: An X-ray diagnostic apparatus includes: a detector for detecting that a gas enters the blood vessel of a subject; and a bed control part that, when the detector detects that the gas is mixed, controls the bed to incline the bed so as to avoid the gas from mixing into the head part of the subject.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The embodiments disclosed in this specification and the drawings relate to an X-ray diagnostic apparatus, an X-ray diagnostic system, and a control method for an X-ray diagnostic apparatus.

Background Art

[0002] Conventionally, in an X-ray diagnostic apparatus, contrast imaging has been performed in which a catheter is inserted into a blood vessel of a subject, and a contrast agent is injected into the blood vessel through the catheter to collect an X-ray image. In such contrast imaging, when injecting the contrast agent into the blood vessel, if a gas such as air is injected into the blood vessel together with the contrast agent, the subject may develop embolism.

[0003] In order to prevent gas from entering the blood vessel in such contrast imaging, the operator checks the syringe filled with the contrast agent before injecting the contrast agent, and removes bubbles if there are bubbles in the syringe. However, it may be difficult to completely remove the bubbles from the syringe, and there are cases where gas enters the blood vessel of the subject.

[0004] Therefore, when gas enters the blood vessel of the subject, in order to avoid the onset of embolism, the operator stops injecting the contrast agent, observes the subject's condition, or, if necessary, places the subject in the left lateral decubitus position to send gas to the heart, making it easier for the gas to be sent from the heart to the pulmonary artery so that the gas is absorbed from the pulmonary artery, or places the patient in a position with the head lowered to prevent the onset of embolism in the cerebral blood vessels. However, since such measures to avoid the onset of embolism are carried out by the operator manually operating the hospital bed, the burden on the operator is increasing. Therefore, it is desired to reduce the risk of the onset of embolism associated with gas mixing by assisting the operator so that the response after gas mixing into the blood vessel can be carried out smoothly.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0006] One of the problems to be solved by the embodiments disclosed in this specification and the drawings is to reduce the risk of embolism caused by gas entrainment. However, the problems to be solved by the embodiments disclosed in this specification and the drawings are not limited to the above problems. The problems corresponding to the respective effects of each configuration shown in the embodiments described later can also be regarded as other problems.

Means for Solving the Problems

[0007] The X-ray diagnostic apparatus according to the embodiment includes a detection unit that detects that gas has entered the blood vessel of a subject, and a bed control unit that, when it detects that gas has entered, controls the bed to tilt the bed so as to avoid gas entrainment in the head of the subject.

Brief Description of the Drawings

[0008]

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Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of an X-ray diagnostic apparatus, an X-ray diagnostic system, and a control method of the X-ray diagnostic apparatus will be described with reference to the drawings. In the following description, components having substantially the same functions and configurations will be denoted by the same reference numerals, and duplicate explanations will be made only when necessary.

[0010] 〔First Embodiment〕 Using FIGS. 1 and 2, a configuration example of the X-ray diagnostic system according to the first embodiment will be described. FIG. 1 is a schematic diagram showing the appearance of the X-ray diagnostic system according to the first embodiment. FIG. 2 is a block diagram showing a configuration example of the X-ray diagnostic system according to the first embodiment. As shown in FIGS. 1 and 2, the X-ray diagnostic system 1 according to the first embodiment includes an X-ray diagnostic apparatus 10 and an injector 30.

[0011] The X-ray diagnostic apparatus 10 performs imaging on the subject P and collects X-ray images from the subject P. Here, imaging includes "fluoroscopy" in which a low-dose X-ray is irradiated to obtain a plurality of time-series X-ray images (moving images), and "radiography" in which a high-dose X-ray is irradiated to obtain a plurality of time-series X-ray images (moving images) or a still X-ray image. Note that "fluoroscopy" may be appropriately read as "fluoroscopic irradiation" or "X-ray fluoroscopy", etc. In the following, for the sake of specific description, the case where the X-ray diagnostic apparatus 10 is a cardiovascular X-ray diagnostic apparatus having two imaging systems with a biplane structure will be described as an example.

[0012] As shown in FIGS. 1 and 2, the X-ray diagnostic apparatus 10 according to the present embodiment includes an X-ray high-voltage apparatus 11, a first X-ray tube 12, a first X-ray collimator 13, a first X-ray detector 14, a first arm 15, a first arm support portion 16, a second X-ray tube 17, a second X-ray collimator 18, a second X-ray detector 19, a second arm 20, a second arm support portion 21, an arm drive portion 22, a couch 23, a first display 24, a memory 25, an input interface 26, a second display 27, and a processing circuit 28.

[0013] The X-ray high voltage device 11 supplies high voltage to the first X-ray tube 12 and the second X-ray tube 17 under the control of the processing circuit 28. For example, the X-ray high voltage device 11 has electric circuits such as a transformer and a rectifier, and includes a high voltage generating device that generates the high voltage applied to the first X-ray tube 12 and the second X-ray tube 17, and an X-ray control device that controls the output voltage according to the X-rays irradiated by the first X-ray tube 12 and the second X-ray tube 17. Note that the high voltage generating device may be of a transformer type or an inverter type.

[0014] The first X-ray tube 12 and the second X-ray tube 17 are vacuum tubes having a cathode (filament) that generates thermoelectrons and an anode (target) that generates X-rays upon receiving the collision of thermoelectrons. The first X-ray tube 12 and the second X-ray tube 17 generate X-rays by irradiating thermoelectrons from the cathode toward the anode using the high voltage supplied from the X-ray high voltage device 11. For example, the first X-ray tube 12 and the second X-ray tube 17 include rotating anode type X-ray tubes that generate X-rays by irradiating thermoelectrons onto a rotating anode.

[0015] The first X-ray collimator 13 and the second X-ray collimator 18 are composed of a metal plate such as a lead plate. The first X-ray collimator 13 collimates the X-rays generated by the first X-ray tube 12 and controls the range of the X-rays irradiated on the subject P. Similarly, the second X-ray collimator 18 collimates the X-rays generated by the second X-ray tube 17 and controls the range of the X-rays irradiated on the subject P. That is, by narrowing the apertures of the first X-ray collimator 13 and the second X-ray collimator 18, the irradiation range of the X-rays can be narrowed, and conversely, by opening the apertures of the first X-ray collimator 13 and the second X-ray collimator 18, the irradiation range of the X-rays can be widened. Note that the first X-ray collimator 13 and the second X-ray collimator 18 may also be called collimators.

[0016] The first X-ray detector 14 and the second X-ray detector 19 are, for example, X-ray flat panel detectors (FPDs) having detection elements arranged in a matrix. The first X-ray detector 14 detects the X-rays irradiated from the first X-ray tube 12 and transmitted through the subject P, and outputs a detection signal corresponding to the detected X-ray dose to the processing circuit 28. Similarly, the second X-ray detector 19 detects the X-rays irradiated from the second X-ray tube 17 and transmitted through the subject P, and outputs a detection signal corresponding to the detected X-ray dose to the processing circuit 28. Note that the first X-ray detector 14 and the second X-ray detector 19 may be indirect conversion type detectors having a grid, a scintillator array, and an optical sensor array, or may be direct conversion type detectors having semiconductor elements that convert the incident X-rays into electrical signals.

[0017] The first arm 15 holds the first X-ray tube 12, the first X-ray collimator 13, and the first X-ray detector 14. Specifically, the first arm 15 holds the first X-ray tube 12 and the first X-ray collimator 13 and the first X-ray detector 14 so as to face each other with the subject P therebetween. The first arm 15 is also called a C-arm or a C-shaped arm. For example, the first arm 15 rotates and moves under the control of the processing circuit 28.

[0018] The first arm support portion 16 rotatably and / or slidably supports the first arm 15. As shown in FIG. 1, the first arm support portion 16 includes a first arm holder 161, a first support column portion 162, and a floor swivel portion 163. The first arm holder 161 slidably holds the first arm 15 in the arc direction of the first arm 15, that is, in the direction of arrow a1 shown in FIG. 1. Further, the first arm holder 161 is attached to the first support column portion 162 so as to be rotatable about a rotation axis a2 that is, for example, an axis parallel to the Z-axis. Note that as the first arm holder 161 rotates around the rotation axis a2, the first arm 15 also rotates around the rotation axis a2.

[0019] The first support part 162 is attached to the floor turning part 163 so as to be rotatable about a rotation axis a3 which is, for example, an axis parallel to the Y-axis. The floor turning part 163 is attached to the floor surface so as to be rotatable about a rotation axis a4 which is, for example, an axis parallel to the Y-axis at one end. The floor turning part 163 supports the first support part 162 at the other end.

[0020] The second arm 20 holds the second X-ray tube 17, the second X-ray collimator 18, and the second X-ray detector 19. Specifically, the second arm 20 holds the second X-ray tube 17 and the second X-ray collimator 18 and the second X-ray detector 19 so as to face each other with the subject P therebetween. The second arm 20 is also called an Ω arm or an Ω-shaped arm. For example, the second arm 20 rotates and moves under the control of the processing circuit 28.

[0021] The second arm support part 21 supports the second arm 20 so as to be rotatable and / or slidable. As shown in FIG. 1, the second arm support part 21 includes a second arm holder 211 and a second support part 212. The second arm holder 211 holds the second arm 20 so as to be slidable in the arc direction of the second arm 20, that is, in the direction of arrow a5 shown in FIG. 1. Further, the second arm holder 211 is attached to the second support part 212 so as to be slidable in the X-axis direction via, for example, a rail r1. Note that as the second arm holder 211 slides in the X-axis direction, the second arm 20 also slides in the X-axis direction.

[0022] The second support part 212 is slidably attached in the Z-axis direction via a rail r2 attached to the ceiling surface. Note that as the second support part 212 moves in the Z-axis direction, the second arm 20 and the second arm holder 211 also move in the Z-axis direction.

[0023] The arm drive unit 22 reads the drive signal from the processing circuit 28 and is composed of a motor, an actuator, or the like that rotationally drives or slides the first arm 15 and the second arm 20 via the first arm support portion 16 and the second arm support portion 21.

[0024] The bed 23 is a bed on which the subject P is placed. Note that the subject P is not included in the X-ray diagnostic apparatus 10. This bed 23 includes a base 231, a bed drive unit 232, a top plate 233, and a support frame 234.

[0025] The base 231 supports the top plate 233 and the support frame 234 so as to be movable in the vertical direction. Specifically, the base 231 supports the top plate 233 and the support frame 234 so as to be movable along the Y-axis direction. Further, the base 231 supports the top plate 233 and the support frame 234 so as to be rotatable about a rotation axis a6 parallel to the Z-axis. Further, the base 231 supports the top plate 233 and the support frame 234 so as to be rotatable about a rotation axis a7 parallel to the X-axis.

[0026] The bed drive unit 232 is a motor or an actuator that moves the top plate 233 and the support frame 234 in the vertical direction, supports the top plate 233 and the support frame 234 so as to be tiltable about a rotation axis a6 parallel to the Z-axis, that is, so as to be tiltable with respect to the rotation axis a6 parallel to the Z-axis, supports the top plate 233 and the support frame 234 so as to be tiltable about a rotation axis a7 parallel to the X-axis, that is, so as to be tiltable with respect to the rotation axis a7 parallel to the X-axis, or moves the top plate 233 on which the subject P is placed along the Z-axis direction, which is the major axis direction of the top plate 233. Note that the bed drive unit 232 may move the support frame 234 in the major axis direction of the top plate 233 in addition to the top plate 233.

[0027] The top plate 233 is provided on the upper surface of the support frame 234 and is a plate on which the subject P is placed. The support frame 234 supports the top plate 233 so as to be movable along the Z-axis direction.

[0028] The first display 24 is composed of one or more display areas and displays various types of information such as X-ray images generated by the processing circuit 28. For example, the first display 24 displays X-ray images (moving images) taken by fluoroscopy and X-ray images (still images) taken by radiography. This first display 24 is arranged at a position visible to the operator in the examination room and is composed of a general display output device such as a liquid crystal display or an OLED (Organic Light Emitting Diode) display.

[0029] The memory 25 is realized by, for example, semiconductor memory elements such as RAM (Random Access Memory) and flash memory, hard disks, optical disks, etc. In the present embodiment, for example, the memory 25 stores programs and the like executed by the processing circuit 28 included in the X-ray diagnostic apparatus 10.

[0030] The input interface 26 receives various input operations from the operator, for example, converts the received input operations into electrical signals and outputs them to the processing circuit 28. For example, the input interface 26 receives input of information regarding the subject P, imaging conditions when imaging the subject P, injection conditions such as the injection speed and injection rate of the injector 30, injection start and injection stop of the contrast agent, etc. This input interface 26 is realized by, for example, a mouse, keyboard, trackball, manual switch, foot switch, button, joystick, etc. The input interface 26 according to the present embodiment is provided in the examination room. Note that the input interface 26 may be provided both inside and outside the examination room, or may be provided only outside the examination room. Also, the input interface 26 may be configured by a tablet terminal or the like capable of wireless communication with the X-ray diagnostic apparatus 10 main body.

[0031] The second display 27 displays various types of information such as images generated by the processing circuit 28. The second display 27 is arranged outside the examination room and is constituted by a general display output device such as a liquid crystal display or an OLED (Organic Light Emitting Diode) display.

[0032] The processing circuit 28 is a control circuit that performs overall control of this X-ray diagnostic apparatus 10 and is also an arithmetic circuit that performs various calculations. For example, the processing circuit 28 according to the present embodiment has a detection function 281, a bed control function 282, a notification function 283, a transmission function 284, an imaging control function 285, and an image generation function 286. The detection function 281 corresponds to the detection unit according to the present embodiment, the bed control function 282 corresponds to the bed control unit according to the present embodiment, the notification function 283 corresponds to the notification unit according to the present embodiment, the transmission function 284 corresponds to the transmission unit according to the present embodiment, the imaging control function 285 corresponds to the imaging control unit according to the present embodiment, and the image generation function 286 corresponds to the image generation unit according to the present embodiment.

[0033] In the embodiment shown in FIG. 2, each processing function performed by the detection function 281, the bed control function 282, the notification function 283, the transmission function 284, the imaging control function 285, and the image generation function 286 is stored in the memory 25 in the form of a program executable by a computer. The processing circuit 28 is a processor that reads out and executes the program from the memory 25 to realize the functions corresponding to the respective programs. In FIG. 2, although it has been described that the detection function 281, the bed control function 282, the notification function 283, the transmission function 284, the imaging control function 285, and the image generation function 286 are realized by a single processing circuit 28, it is also possible to configure the processing circuit 28 by combining a plurality of independent processors and have each processor execute a program to realize these functions.

[0034] The detection function 281 is a function for detecting that gas has entered the blood vessels of the subject P. Since the X-ray diagnostic system 1 according to the present embodiment includes the injector 30, the detection function 281 according to the present embodiment detects that gas has entered the blood vessels of the subject P when a contrast agent is injected into the blood vessels of the subject P by the injector 30. Further, the detection function 281 according to the present embodiment detects that gas has entered by receiving a gas mixture notification, which is a notification regarding the entry of gas into the blood vessels of the subject P, from the injector 30. The bed control function 282 is a function for controlling the bed 23 to tilt the bed 23 so as to avoid gas mixture into the head of the subject P when the detection function 281 detects that gas has entered.

[0035] Here, with reference to FIGS. 3 and 4, the bed control for avoiding gas mixture into the head of the subject P will be described. FIG. 3 is a diagram showing an example of bed control for avoiding gas mixture into the head of the subject P in the X-ray diagnostic apparatus 10 according to the first embodiment. FIG. 4 is a diagram showing another example of bed control for avoiding gas mixture into the head of the subject P in the X-ray diagnostic apparatus 10 according to the first embodiment.

[0036] First, in explaining the bed control for avoiding gas mixture into the head of the subject P, an example of the posture of the subject P for avoiding gas mixture into the head of the subject P will be described. If gas enters the blood vessels of the subject P, in order to avoid gas mixture into the head of the subject P, the operator places the subject P in the left lateral position. Thereby, it is possible to send air to the heart, make it easier to send air from the heart into the pulmonary artery, and cause the air to be absorbed from the pulmonary artery.

[0037] Therefore, as shown in FIG. 3, as a bed control for avoiding gas intrusion into the head of the subject P, the bed control function 282 controls the bed 23 to tilt the bed 23 about the rotation axis a6 so that the posture of the subject P becomes the left lateral position. That is, the bed control function 282 controls the bed 23 to tilt the bed 23 so that the left half of the subject P is lower than the right half of the subject P. At this time, the tilting angle θ1 of the bed 23 shown in FIG. 3 is an angle such that the subject P does not fall from the top plate 233 of the bed 23, and is, for example, 5° to 10°.

[0038] Note that the posture of the subject P for avoiding gas intrusion into the head of the subject P is not limited to the left lateral position. The operator may take a posture in which the feet of the subject P are raised and the head of the subject P is lowered in order to avoid gas intrusion into the head of the subject P and prevent the occurrence of air embolism in the cerebral blood vessels. Thereby, gas is likely to collect in the feet of the subject P, and gas is less likely to enter the head of the subject P.

[0039] Therefore, as shown in FIG. 4, as a bed control for avoiding gas intrusion into the head of the subject P, the bed control function 282 controls the bed 23 to tilt the bed 23 about the rotation axis a7 so that the posture of the subject P becomes a posture in which the feet of the subject P are raised and the head of the subject P is lowered. That is, the bed control function 282 controls the bed 23 to tilt the bed 23 so that the head of the subject P is lower than the feet of the subject P. At this time, the tilting angle θ2 of the bed 23 shown in FIG. 4 is an angle such that the subject P does not fall from the top plate 233 of the bed 23, and is, for example, 5° to 10°.

[0040] The angles θ1 and θ2 for tilting these beds 23 are respectively set by the operator. Therefore, the angles θ1 and θ2 for tilting the bed 23 are not limited to 5° - 10°. That is, the angle for tilting the bed 23 is arbitrary. For example, it may be 5° or less, or may be 10° or more. The value of this set angle is stored in the memory 25. Then, when the operator inputs an execution instruction for auto-positioning of the bed 23 via the input interface 26 to make the posture of the subject P such that the feet of the subject P are raised and the head of the subject P is lowered, and / or to make the left lateral decubitus position, the bed control function 282 controls the bed 23 to tilt the bed 23 according to the set angle.

[0041] Note that the posture of the subject P to avoid gas mixing into the head of the subject P is not limited to either the case where the subject P is in the left lateral decubitus position or the case where the posture of the subject P is such that the feet of the subject P are raised and the head of the subject P is lowered. That is, as a posture of the subject P to avoid gas mixing into the head of the subject P, while the subject P is in the left lateral decubitus position, the posture of the subject P may be such that the feet of the subject P are raised and the head of the subject P is lowered.

[0042] The notification function 283 is a function that notifies information indicating that gas has entered the blood vessel of the subject P when the detection function 281 detects that gas has entered the blood vessel of the subject P. Here, the information indicating that gas has entered the blood vessel of the subject P is a message or the like indicating that gas has entered the blood vessel of the subject P. For example, the transmitter function 284 is a function that transmits a stop signal for stopping the injection of the contrast agent to the injector 30 when the detection function 281 detects that gas has entered the blood vessel of the subject P.

[0043] The imaging control function 285 is a function that controls the X-ray high voltage device 11 according to the imaging conditions input via the input interface 26. Further, the imaging control function 285 controls the arm drive unit 22 according to the imaging conditions to perform X-ray imaging such as fluoroscopy or radiography. The image generation function 286 is a function that generates an X-ray image based on the projection data output from the first X-ray detector 14 and the second X-ray detector 19.

[0044] The injector 30 is a device that controls the injection of a contrast agent into the subject P. Specifically, for example, before acquiring an angiogram by fluoroscopy or radiography, the injector 30 starts or stops the injection of the contrast agent into the subject P according to the injection conditions such as the injection volume and injection rate transmitted from the processing circuit 28 of the X-ray diagnostic apparatus 10, and signals for injection start and injection stop. This injector 30 corresponds to the injection control device in the present embodiment. Note that the type of the contrast agent injected into the subject P is not particularly limited, and it may be a positive contrast agent mainly composed of iodine, barium sulfate, or the like, or a gas contrast agent such as carbon dioxide.

[0045] As shown in FIG. 1, the injector 30 according to the present embodiment includes an injector main body 31, a syringe 32, and an extension tube 33. The injector main body 31 controls the injection of the contrast agent filled in the syringe 32. This injector main body 31 is held by an arm suspended from the ceiling. The syringe 32 is filled with the contrast agent. One end of the extension tube 33 is attached to the syringe 32, and the other end is attached to a needle or the like inserted into the subject P. Note that the injector main body 31 may be held by a floor-standing stand instead of an arm suspended from the ceiling.

[0046] Also, as shown in FIG. 2, the injector 30 according to the present embodiment includes a gas mixture detection unit 34. The gas mixture detection unit 34 detects whether gas is mixed in the syringe 32 or the extension tube 33. The gas mixture detection unit 34 is composed of, for example, a light emitting element such as a laser diode and a light receiving element such as a photosensor. These light emitting element and light receiving element are provided on the outer peripheral surface of the syringe 32 and / or the extension tube 33. And when gas is mixed in the syringe 32 and / or the extension tube 33, the gas mixture detection unit 34 detects the gas by the fact that the beam irradiated from the light emitting element is blocked by the gas or liquid in the syringe 32 and / or the extension tube 33, and the light receiving element outputs a reception signal of the blocked beam. When the gas mixture detection unit 34 detects gas, it transmits the detection result to the X-ray diagnostic apparatus 10 as a gas mixture notification which is a notification regarding that gas has entered the blood vessel of the subject P.

[0047] FIG. 5 is a diagram for explaining the installation position of the gas mixture detection unit 34 in the injector 30 according to the first embodiment. As shown in FIG. 5, the gas mixture detection unit 34 according to the present embodiment is installed, for example, at a position close to the subject P in the extension tube 33.

[0048] Note that although the gas mixture detection unit 34 according to the present embodiment described above is configured by a photoelectric sensor including a light emitting element and a light receiving element, the configuration of the gas mixture detection unit 34 is not limited to this. That is, the configuration of the gas mixture detection unit 34 is arbitrary. For example, the gas mixture detection unit 34 may be configured by a capacitance sensor, an ultrasonic sensor composed of a transducer, or the like.

[0049] FIG. 6 is a flowchart for explaining the content of the bed control process executed by the X-ray diagnostic apparatus 10 of the X-ray diagnostic system 1 according to the first embodiment. In the bed control process according to the present embodiment, when X-ray imaging using a contrast agent is performed, if it is detected that gas has entered the blood vessels of the subject P, information indicating that gas has entered is notified, or information for confirming whether to execute control to tilt the bed is displayed, the injection of the contrast agent is stopped, or control to tilt the bed is executed. For example, this bed control process is a process executed when it is detected that gas has entered the blood vessels of the subject P.

[0050] As shown in FIG. 6, first, the X-ray diagnostic apparatus 10 determines whether it has detected that gas has entered the blood vessels of the subject P (step S11). The process of determining whether it has detected that gas has entered the blood vessels of the subject P is realized by the detection function 281 in the processing circuit 28. Specifically, the detection function 281 according to the present embodiment detects that gas has entered the blood vessels of the subject P by receiving a gas mixture notification from the injector 30. Therefore, the X-ray diagnostic apparatus 10 determines whether it has detected that gas has entered the blood vessels of the subject P by determining whether it has received a gas mixture notification from the injector 30. More specifically, the detection function 281 determines whether it has detected that gas has entered the blood vessels of the subject P by determining whether it has received the detection result of the gas mixture detection unit 34 as a gas mixture notification from the injector 30. And in step S11, when the X-ray diagnostic apparatus 10 has not detected that gas has entered the blood vessels of the subject P (step S11: No), the process of step S11 is repeated and the apparatus waits until it detects that gas has entered the blood vessels of the subject P.

[0051] On the one hand, in step S11, when it is detected that gas has entered (step S11: Yes), the X-ray diagnostic apparatus 10 notifies information indicating that gas has entered the blood vessel of the subject P (step S13). The process of notifying the information indicating that gas has entered the blood vessel of the subject P is realized by the notification function 283 in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 notifies information indicating that gas has entered the blood vessel of the subject P via the first display 24.

[0052] Next, as shown in FIG. 6, the X-ray diagnostic apparatus 10 notifies information for confirming whether to execute control to tilt the hospital bed 23 (step S15). The process of notifying the information for confirming whether to execute control to tilt the hospital bed 23 is realized by the notification function 283 in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 notifies information for confirming whether to execute control to tilt the hospital bed 23 via the first display 24. That is, in steps S13 and S15, the notification function 283 notifies the information indicating that gas has entered the blood vessel of the subject P and also notifies the information for confirming whether to execute control to tilt the hospital bed 23.

[0053] FIG. 7 is a diagram showing an example of the notification mode of the X-ray diagnostic apparatus 10 according to the first embodiment. As shown in FIG. 7, the notification function 283 notifies, via the first display 24, a message M1 of "Gas entry detected" as the information indicating that gas has entered the blood vessel of the subject P. Further, together with this message M1, the notification function 283 notifies, via the first display 24, a confirmation dialog D1 as the information for confirming whether to execute control to tilt the hospital bed 23. As shown in FIG. 7, this confirmation dialog D1 includes a message of "Do you want to tilt the hospital bed?", a button B1, and a button B2.

[0054] In the example shown in FIG. 7, the confirmation dialog D1 is notified as information for confirming whether or not to execute the control for tilting the hospital bed 23. However, the information for confirming whether or not to execute the control for tilting the hospital bed 23 notified to the operator is not limited to the confirmation dialog D1. That is, the content of the information for confirming whether or not to execute the control for tilting the hospital bed 23 is arbitrary. For example, the notification function 283 may notify a message as information for confirming whether or not to execute the control for tilting the hospital bed 23.

[0055] Next, as shown in FIG. 6, the X-ray diagnostic apparatus 10 transmits a stop signal (step S17). This process of transmitting the stop signal is realized by the transmission function 284 in the processing circuit 28. Specifically, when the X-ray diagnostic apparatus 10 detects that gas has entered in step S11, it transmits a stop signal for stopping the injection of the contrast agent to the injector 30. Then, the injector 30 that has received the stop signal stops the injection of the contrast agent.

[0056] Next, as shown in FIG. 6, the X-ray diagnostic apparatus 10 determines whether or not to execute the control for tilting the hospital bed 23 (step S19). This process of determining whether or not to execute the control for tilting the hospital bed 23 is realized by the hospital bed control function 282 in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 determines whether or not to execute the control for tilting the hospital bed 23 by determining whether or not it has received an input operation for executing the control for tilting the hospital bed 23 from the operator via the input interface 26. More specifically, in the example shown in FIG. 7, the hospital bed control function 282 determines whether or not to execute the control for tilting the hospital bed 23 by receiving an input operation from the operator for the button B1 or the button B2 in the confirmation dialog D1 displayed on the first display 24 via the input interface 26.

[0057] And, in step S19, when the control to tilt the hospital bed 23 is not executed (step S19: No), the X-ray diagnostic apparatus 10 transmits a start signal (step S21). This process of transmitting the start signal is realized by the transmission function 284 in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 transmits a start signal for restarting the injection of the contrast agent to the injector 30. Then, the injector 30 that has received the start signal restarts the injection of the contrast agent and restarts imaging such as fluoroscopy.

[0058] On the other hand, in step S19, when the control to tilt the hospital bed 23 is executed (step S19: Yes), the X-ray diagnostic apparatus 10 tilts the hospital bed 23 so as to avoid gas mixing into the head of the subject P (step S23). This process of tilting the hospital bed 23 is realized by the hospital bed control function 282 in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 controls the hospital bed 23 to tilt the hospital bed 23 so that at least the left side of the head of the subject P is lower than the right foot of the subject P. More specifically, the hospital bed control function 282 controls the hospital bed 23 according to the set angle stored in the memory 25 so as to raise the feet of the subject P and lower the head of the subject P, and / or to tilt the hospital bed 23 so as to be in the left lateral decubitus position.

[0059] By executing this step S21 or step S23, the hospital bed control process according to the present embodiment is terminated.

[0060] As described above, in the X-ray diagnostic system 1 according to the present embodiment, when the X-ray diagnostic apparatus 10 detects that gas has entered the blood vessel of the subject P by receiving a gas mixing notification from the injector 30, it notifies information indicating that gas has entered, transmits a stop signal to the injector 30, and when executing the control to tilt the hospital bed 23, it tilts the hospital bed 23. Therefore, it supports the operator so that the response after gas mixing can be smoothly implemented, and the risk of onset of embolism associated with gas mixing can be reduced.

[0061] In the above-described first embodiment, the injector 30 automatically injects the contrast agent according to the injection conditions. However, the injection of the contrast agent may also be manually performed by a doctor operating the injector 30.

[0062] 〔Second Embodiment〕 In the X-ray diagnostic system 1 according to the above-described first embodiment, the detection function 281 of the X-ray diagnostic apparatus 10 detects that gas has entered the blood vessel of the subject P by receiving the detection result of the gas mixture detection unit 34 from the injector 30 as a gas mixture notification. However, the method of detecting that gas has entered the blood vessel of the subject P is not limited to this. In the second embodiment, the detection function may detect that gas has entered the blood vessel of the subject P using the X-ray image of the subject P. Hereinafter, the parts different from the above-described first embodiment will be described. Note that since the appearance of the X-ray diagnostic system 1 is the same as that of FIG. 1 in the above-described first embodiment, the description thereof will be omitted.

[0063] FIG. 8 is a block diagram showing a configuration example of the X-ray diagnostic system 1 according to the second embodiment, and is a diagram corresponding to FIG. 2 in the above-described first embodiment. As shown in this FIG. 8, since the function of the detection function and the configuration of the injector are different from those in the first embodiment, in this embodiment, they are denoted as the detection function 281a and the injector 30a. Note that the configurations and functions other than the detection function 281a and the injector 30a are the same as those in FIG. 2 in the above-described first embodiment, and thus the description thereof will be omitted.

[0064] The detection function 281a is a function for detecting that gas has entered the blood vessels of the subject P. Since the X-ray diagnostic system 1 according to the present embodiment also includes the injector 30, the detection function 281 according to the present embodiment also detects that gas has entered the blood vessels of the subject P when a contrast agent is injected into the blood vessels of the subject P by the injector 30. In the present embodiment, the detection function 281a detects that gas has entered the blood vessels of the subject P by detecting the gas depicted on the contrast X-ray image of the subject P. Specifically, the detection function 281a performs image analysis on the contrast X-ray image generated by the image generation function 286, and detects the gas depicted on the contrast X-ray image of the subject P, thereby detecting that gas has entered the blood vessels of the subject P. Here, the contrast X-ray image is an X-ray image collected under contrast, and includes a fluoroscopic image and a radiographic image collected under contrast.

[0065] FIG. 9 is a diagram showing an example of a contrast X-ray image generated in the X-ray diagnostic apparatus 10 in the X-ray diagnostic system 1 according to the second embodiment. FIG. 9(a) is a contrast X-ray image before gas enters the blood vessels of the subject P, and FIG. 9(b) is a contrast X-ray image when gas has entered the blood vessels of the subject P. In the example shown in FIG. 9, each contrast X-ray image is a fluoroscopic image obtained by injecting a contrast agent into the subject P and performing contrast imaging. The dot hatching in the fluoroscopic image indicates the contrast agent CON injected into the blood vessels, and the diagonal hatching in FIG. 9(b) indicates the gas A1 contained in the contrast agent CON. Also, in the example shown in FIG. 9, the catheter C1 is included in the fluoroscopic image. As shown in FIG. 9, the pixel values of the contrast agent CON and the gas A1 in the contrast X-ray image are different. Therefore, the detection function 281a performs image analysis on the contrast X-ray image, and when the pixel value different from the pixel value of the contrast agent CON is included in the contrast agent CON injected into the blood vessels, it is assumed that the gas A1 is included in the contrast agent CON, and the gas A1 depicted on the contrast X-ray image of the subject P is detected, and it is detected that the gas A1 has entered the blood vessels of the subject P.

[0066] The injector 30a according to this embodiment is different from the injector 30 according to the first embodiment described above in that it does not include a gas mixture detection unit 34. Instead, the injector 30a according to this embodiment controls the injection of the contrast agent CON into the subject P without detecting whether or not the gas A1 is mixed in the syringe 32 or the extension tube 33. This is because the detection function 281a detects the gas A1 depicted on the contrast X-ray image of the subject P, thereby detecting that the gas A1 has entered the blood vessel of the subject P.

[0067] FIG. 10 is a flowchart for explaining the content of the bed control process executed by the X-ray diagnostic apparatus 10 of the X-ray diagnostic system 1 according to the second embodiment, and corresponds to FIG. 6 in the first embodiment described above. In the bed control process according to this embodiment, when X-ray imaging using the contrast agent CON is executed, if it is detected that the gas A1 has entered the blood vessel of the subject P, information indicating that the gas A1 has entered is notified, or information for confirming whether or not to execute control to tilt the bed 23 is notified, the injection of the contrast agent CON is stopped, or the bed 23 is tilted. For example, this bed control process is a process executed when it is detected that the gas A1 has entered the blood vessel of the subject P.

[0068] As shown in FIG. 10, first, the X-ray diagnostic apparatus 10 determines whether or not it has detected that the gas A1 has entered the blood vessel of the subject P (step S31). The process of determining whether or not the gas A1 has entered the blood vessel of the subject P is realized by the detection function 281a in the processing circuit 28. Specifically, the detection function 281a according to the present embodiment detects the gas A1 drawn on the contrast X-ray image of the subject P, so as to detect that the gas A1 has entered the blood vessel of the subject P. Therefore, the X-ray diagnostic apparatus 10 determines whether or not it has detected the gas A1 drawn on the contrast X-ray image of the subject P, thereby determining whether or not the gas A1 has entered the blood vessel of the subject P. Then, in step S11, when it has not detected that the gas A1 has entered the blood vessel of the subject P (step S31: No), the process of step S11 is repeated and the apparatus waits until it detects that the gas A1 has entered the blood vessel of the subject P. Since the processes from step S13 to step S23 after step S31 are the same as the processes from step S13 to step S23 in FIG. 6 in the above-described first embodiment, the description thereof is omitted.

[0069] As described above, in the X-ray diagnostic system 1 according to the present embodiment, when the X-ray diagnostic apparatus 10 detects that the gas A1 has entered the blood vessel of the subject P by detecting the gas A1 drawn on the contrast X-ray image of the subject P, it notifies the information indicating that the gas A1 has entered, transmits a stop signal, and when executing the control to tilt the hospital bed 23, it is set to tilt the hospital bed 23. Thus, similar to the first embodiment described above, it supports the operator so that the response after gas mixing can be smoothly performed, and the risk of onset of embolism associated with gas mixing can be reduced.

[0070] In the above-described second embodiment, the operator automatically injects the contrast agent CON using the injector 30. However, the injection of the contrast agent CON may be manually performed by a doctor operating the injector 30, or may be manually performed by an operator such as a doctor using a syringe filled with the contrast agent CON without using the injector 30. That is, in the above-described second embodiment, the injector 30 is not necessarily provided.

[0071] 〔Third Embodiment〕 In the X-ray diagnostic system 1 according to the first and second embodiments described above, when the X-ray diagnostic apparatus 10 detects that gas A1 has entered the blood vessel of the subject, as information for confirming whether to execute the control of tilting the hospital bed 23, a confirmation dialog D1 is notified, and according to the input operation of the operator, it is determined whether to execute the control of tilting the hospital bed 23, and when executing the control of tilting the hospital bed 23, the hospital bed 23 is tilted. However, the present invention is not limited to this. In the third embodiment, when the X-ray diagnostic apparatus 10 detects that gas A1 has entered and the urgency is high, information indicating that the control of tilting the hospital bed 23 is to be executed may be notified, and the hospital bed 23 may be tilted. Hereinafter, the parts different from the first embodiment described above will be described. Since the appearance of the X-ray diagnostic system 1 is the same as that of FIG. 1 in the first embodiment described above, the description thereof is omitted.

[0072] FIG. 11 is a block diagram showing a configuration example of the X-ray diagnostic system 1 according to the third embodiment, and corresponds to FIG. 2 in the above-described first embodiment. As shown in this FIG. 11, since the bed control function and the notification function are different from those in the first embodiment, in this embodiment, they are denoted as the bed control function 282a and the notification function 283a. Further, as shown in FIG. 11, the X-ray diagnostic apparatus 10 according to the present embodiment is configured by adding a derivation function 287 to the processing circuit 28 with respect to the X-ray diagnostic apparatus 10 according to the above-described first embodiment. The derivation function 287 corresponds to the derivation unit according to the present embodiment. In addition, the configurations and functions other than the bed control function 282a, the notification function 283a, and the derivation function 287 are the same as those in FIG. 2 in the above-described first embodiment, and thus the description thereof is omitted.

[0073] The bed control function 282a according to the present embodiment is a function of controlling the bed 23 to tilt the bed 23 so as to avoid gas mixing into the head of the subject P when the detection function 281 detects that the gas A1 has entered. Further, the bed control function 282a according to the present embodiment determines whether or not the urgency of tilting the bed 23 is high based on the time until the bed 23 is tilted, which is derived by the derivation function 287. The time until the bed 23 is tilted, which is derived by the derivation function 287, is, for example, the time until the gas A1 that has entered the blood vessel of the subject P reaches the head. Therefore, the bed control function 282a can reduce the risk of gas mixing into the head of the subject P by tilting the bed 23 so as to avoid gas mixing into the head of the subject P within the time until the bed 23 is tilted, which is derived by the derivation function 287.

[0074] When the detection function 281 detects that the gas A1 has entered, and the urgency to tilt the hospital bed 23 is not high, the notification function 283a according to the present embodiment notifies information indicating that the gas A1 has entered the blood vessel of the subject P, and notifies information for confirming whether to execute the control to tilt the hospital bed 23. Further, when the detection function 281 detects that the gas A1 has entered the blood vessel of the subject P and the urgency to tilt the hospital bed 23 is high, the notification function 283a according to the present embodiment notifies information indicating that the gas A1 has entered the blood vessel of the subject P, and notifies information indicating that the control to tilt the hospital bed 23 is to be executed.

[0075] The derivation function 287 derives the time until the hospital bed 23 is tilted based on at least one of the flow rate of the contrast agent CON and the distance from the injection position of the contrast agent CON to the head of the subject P. Here, the flow rate of the contrast agent CON is the speed at which the contrast agent CON flows. For example, it is the injection speed of the contrast agent CON included in the injection conditions, the injection speed of the contrast agent CON derived by analyzing the contrast X-ray image, the injection speed of the contrast agent CON derived by detection with a sensor, and the like. The distance from the injection position of the contrast agent CON to the head is, for example, the shortest distance from the injection position of the contrast agent CON to the head.

[0076] FIG. 12 is a flowchart for explaining the content of the bed control process executed by the X-ray diagnostic apparatus 10 of the X-ray diagnostic system 1 according to the third embodiment. In the bed control process according to the present embodiment, when X-ray imaging using the contrast agent CON is executed and it is detected that the gas A1 has entered the blood vessel of the subject P, at least any one of the flow rate of the contrast agent CON and the distance from the injection position to the head of the subject P is acquired, the time until the bed 23 is tilted is derived, it is determined whether the urgency is high, information indicating that the gas A1 has entered is notified, information for confirming whether to execute the control of tilting the bed is displayed, information indicating that the control of tilting the bed 23 is to be executed is notified, the injection of the contrast agent CON is stopped, or the control of tilting the bed 23 is executed. For example, this bed control process is a process executed when it is detected that the gas A1 has entered the blood vessel of the subject P. Note that the process of step S11 is the same as the process of step S11 in FIG. 6 in the first embodiment described above, and thus the description thereof is omitted.

[0077] Then, in step S11, when it is detected that the gas A1 has entered (step S11: Yes), the X-ray diagnostic apparatus 10 acquires at least any one of the flow rate of the contrast agent CON and the distance to the head (step S41). The process of acquiring at least any one of the flow rate of the contrast agent CON and the distance to the head is realized by the derivation function 287 in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 according to the present embodiment acquires the injection rate in the injection conditions of the contrast agent CON as the flow rate of the contrast agent CON. Further, the X-ray diagnostic apparatus 10 according to the present embodiment acquires the distance from the injection position of the contrast agent CON to the head by analyzing an optical image captured by a camera (not shown) or the like. Note that the method of acquiring the distance from the injection position of the contrast agent CON to the head is not limited to the case of analyzing an optical image captured by a camera (not shown) or the like. That is, the method of acquiring the distance from the injection position of the contrast agent CON to the head is arbitrary. For example, the injection site of the contrast agent CON and the height of the patient may be acquired, and the distance from the injection position of the contrast agent CON to the head may be derived based on the injection site of the contrast agent CON and the height of the patient.

[0078] Next, as shown in FIG. 12, the X-ray diagnostic apparatus 10 calculates the time until the hospital bed 23 is tilted (step S43). The process of calculating the time until the hospital bed is tilted is realized by the derivation function 287 in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 derives the time until the hospital bed 23 is tilted based on at least either the flow rate of the contrast agent CON acquired in step S41 or the distance from the injection position of the contrast agent CON to the head of the subject P. More specifically, the X-ray diagnostic apparatus 10 uses a predetermined calculation formula for deriving the time until the hospital bed 23 is tilted based on at least either the flow rate of the contrast agent CON or the distance from the injection position of the contrast agent CON to the head of the subject P, thereby deriving the time until the hospital bed 23 is tilted.

[0079] Note that the method of deriving the time until the hospital bed 23 is tilted is not limited to using a predetermined calculation formula. That is, the method of deriving the time until the hospital bed 23 is tilted is arbitrary. For example, a table associating at least either the flow rate of the contrast agent CON or the distance from the injection position of the contrast agent CON to the head of the subject P with the time until the hospital bed 23 is tilted is stored in the memory 25, and the derivation function 287 may derive the time until the hospital bed 23 is tilted by referring to the table based on at least either the flow rate of the contrast agent CON or the distance from the injection position of the contrast agent CON to the head of the subject P.

[0080] Next, as shown in FIG. 12, the X-ray diagnostic apparatus 10 determines whether the urgency is high (step S45). This process of determining whether the urgency is high is realized by the hospital bed control function 282a in the processing circuit 28. Specifically, the hospital bed control function 282a determines whether the urgency is high by determining whether the time for tilting the hospital bed 23 derived in step S43 exceeds a predetermined threshold value stored in the memory 25. And when the urgency is not high in step S45 (step S45: No), the X-ray diagnostic apparatus 10 notifies information indicating that the gas A1 has entered (step S13). The processes from step S13 to step S23 after this step S13 are the same as the processes from step S13 to step S23 in FIG. 6 in the above-described first embodiment, and thus the description thereof is omitted.

[0081] On the other hand, when it is determined in step S45 that the urgency is high (step S45: Yes), the X-ray diagnostic apparatus 10 notifies information indicating that the gas A1 has entered the blood vessel of the subject P (step S47). This process of notifying information indicating that the gas A1 has entered the blood vessel of the subject P is realized by the notification function 283a in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 notifies information indicating that the gas A1 has entered the blood vessel of the subject P via the first display 24.

[0082] Next, as shown in FIG. 12, the X-ray diagnostic apparatus 10 notifies information indicating that control for tilting the hospital bed 23 is to be executed (step S49). This process of notifying information indicating that control for tilting the hospital bed 23 is to be executed is realized by the notification function 283a in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 notifies information indicating that control for tilting the hospital bed 23 is to be executed via the first display 24. That is, in step S47 and step S49, the notification function 283a notifies information indicating that the gas A1 has entered the blood vessel of the subject P and notifies information indicating that control for tilting the hospital bed 23 is to be executed.

[0083] FIG. 13 is a diagram showing an example of the notification mode of the X-ray diagnostic apparatus 10 according to the third embodiment, and corresponds to FIG. 7 in the above-described first embodiment. As shown in FIG. 13, the notification function 283a notifies, via the first display 24, a message M1 of "Gas entry detected" as information indicating that the gas A1 has entered the blood vessel of the subject P. Further, the notification function 283 notifies, together with this message M1 and via the first display 24, a message M2 of "Tilt the hospital bed." as information indicating that control for tilting the hospital bed 23 is to be executed.

[0084] In the example shown in FIG. 13, the notification function 283a may notify, via the first display 24, together with the message M1 and the message M2, the time until the hospital bed 23 is tilted as information indicating that control for tilting the hospital bed 23 is to be executed, which is derived in step S43. Further, the notification function 283a may notify, via the first display 24, instead of the message M2, the time until the hospital bed 23 is tilted as information indicating that control for tilting the hospital bed 23 is to be executed, which is derived in step S43.

[0085] Next, as shown in FIG. 12, the X-ray diagnostic apparatus 10 transmits a stop signal (step S51). This process of transmitting the stop signal is realized by the transmission function 284 in the processing circuit 28. Specifically, when the X-ray diagnostic apparatus 10 detects that the gas A1 has entered in step S11, it transmits a stop signal for stopping the injection of the contrast agent CON to the injector 30. Then, the injector 30 that has received the stop signal stops the injection of the contrast agent CON.

[0086] Next, as shown in FIG. 12, the X-ray diagnostic apparatus 10 tilts the examination table 23 so as to avoid gas from entering the head of the subject P (step S53). This process of tilting the examination table 23 is realized by the examination table control function 282a in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 controls the examination table 23 to tilt the examination table 23 so that at least the left side of the head of the subject P is lower than the right foot of the subject P. More specifically, the examination table control function 282a controls the examination table 23 according to the set angle stored in the memory 25, so as to raise the feet of the subject P and lower the head of the subject P, and / or to make the subject P lie on the left side, and tilt the examination table 23.

[0087] Also, in this step S53, the examination table control function 282a according to the present embodiment changes the tilting speed of the examination table 23 based on the time for tilting the examination table 23 derived in step S43, and tilts the examination table 23. Thereby, the examination table control function 282a can complete the control of tilting the examination table 23 within the time for tilting the examination table 23 derived in step S43.

[0088] Then, by executing step S21, step S23 or step S53, the examination table control process according to the present embodiment is terminated.

[0089] As described above, in the X-ray diagnostic system 1 according to the present embodiment, when the X-ray diagnostic apparatus 10 detects that gas A1 has entered the blood vessel of the subject P by receiving a gas mixture notification from the injector 30, the X-ray diagnostic apparatus 10 notifies information indicating that gas A1 has entered, transmits a stop signal, and when executing the control to tilt the examination table 23, tilts the examination table 23. Therefore, similar to the first embodiment described above, the operator can be assisted to smoothly perform the response after gas mixture, and the risk of embolism caused by gas mixture can be reduced.

[0090] In the X-ray diagnostic system 1 according to the present embodiment, the X-ray diagnostic apparatus 10 acquires at least one of the flow rate of the contrast agent CON and the distance to the head, derives the time until the hospital bed 23 is tilted, and when the urgency is high, notifies information indicating that control to tilt the hospital bed 23 is to be executed, and tilts the hospital bed 23 without confirmation by the operator, so that the risk of developing embolism due to gas entrainment can be further reduced.

[0091] In the above-described third embodiment, the information for confirming whether or not to execute the control to tilt the hospital bed 23 may include the time until the hospital bed 23 is tilted, which is derived in step S43 shown in FIG. 12. That is, in step S15 shown in FIG. 12, the notification function 283a may notify the time until the hospital bed 23 is tilted, which is derived in step S43, together with the confirmation dialog D1 shown in FIG. 7, as information for confirming whether or not to execute the control to tilt the hospital bed.

[0092] Also, in step S21 shown in FIG. 12, the hospital bed control function 282a may change the speed at which the hospital bed 23 is tilted based on the time until the hospital bed 23 is tilted, which is derived in step S43, and tilt the hospital bed 23.

[0093] Furthermore, the description of the above-described third embodiment is an explanation when applied to the first embodiment, but it is obvious that the third embodiment is also applicable to the second embodiment.

[0094] 〔Fourth Embodiment〕 In the X-ray diagnostic system 1 according to the first to third embodiments described above, when the X-ray diagnostic apparatus 10 detects that the gas A1 has entered the blood vessel of the subject P, the injector 30 is caused to stop injecting the contrast agent CON by transmitting a stop signal to the injector 30. However, the present invention is not limited to this. In the fourth embodiment, the X-ray diagnostic apparatus 10 may notify information prompting the stop of the injection of the contrast agent CON into the subject P. Hereinafter, the parts different from the first embodiment described above will be described. Note that since the appearance of the X-ray diagnostic system 1 is the same as that of FIG. 1 in the first embodiment described above, the description thereof will be omitted.

[0095] FIG. 14 is a block diagram showing a configuration example of the X-ray diagnostic system 1 according to the fourth embodiment, and corresponds to FIG. 2 in the first embodiment described above. As shown in this FIG. 14, since the notification function is different from that in the first embodiment, in this embodiment, it is denoted as the notification function 283b. Further, as shown in FIG. 14, the X-ray diagnostic apparatus 10 according to the present embodiment is different from the X-ray diagnostic apparatus 10 according to the first embodiment described above in that the processing circuit 28 does not include the transmission function 284. Note that the configurations and functions other than the notification function 283b and the transmission function 284 are the same as those in FIG. 2 in the first embodiment described above, and thus the description thereof will be omitted.

[0096] The notification function 283b according to the present embodiment notifies information prompting the stop of the injection of the contrast agent CON into the subject P.

[0097] FIG. 15 is a flowchart for explaining the content of the bed control process executed by the X-ray diagnostic apparatus 10 of the X-ray diagnostic system 1 according to the fourth embodiment, and is a figure corresponding to FIG. 6 in the above-described first embodiment. In the bed control process according to the present embodiment, when X-ray imaging using the contrast agent CON is executed and it is detected that the gas A1 has entered the blood vessel of the subject P, information indicating that the gas A1 has entered is notified, or information prompting to stop the injection of the contrast agent CON into the subject P is notified, or information for confirming whether to execute control to tilt the bed 23 is notified, or the bed 23 is tilted. For example, this bed control process is a process executed when it is detected that the gas A1 has entered the blood vessel of the subject P. Note that the processes of step S11 and step S13 are the same as the processes of step S11 and step S13 in FIG. 6 in the above-described first embodiment, and thus the description thereof is omitted.

[0098] Next, as shown in FIG. 15, the X-ray diagnostic apparatus 10 notifies information prompting to stop the injection of the contrast agent CON into the subject P (step S61). This process of notifying information prompting to stop the injection of the contrast agent CON into the subject P is realized by the notification function 283b in the processing circuit 28. Specifically, the X-ray diagnostic apparatus 10 notifies information prompting to stop the injection of the contrast agent CON into the subject P via the first display 24. That is, in step S13 and step S61, the notification function 283b notifies information indicating that the gas A1 has entered the blood vessel of the subject P and also notifies information prompting to stop the injection of the contrast agent CON into the subject P.

[0099] FIG. 16 is a diagram showing an example of the notification mode of the X-ray diagnostic apparatus 10 according to the fourth embodiment, and corresponds to FIG. 7 in the above-described first embodiment. As shown in FIG. 16, the notification function 283b notifies, via the first display 24, as information indicating that the gas A1 has entered the blood vessel of the subject P, a message M1 of "Gas entry detected". Further, the notification function 283b notifies, together with this message M1, via the first display 24, as information prompting to stop the injection of the contrast agent CON into the subject P, a message M3 of "Please stop the injection of the contrast agent". The processes of step S15, step S19, and step S23 after this step S61 are the same as the processes of step S15, step S19, and step S23 in FIG. 6 in the above-described first embodiment, and thus the description thereof is omitted.

[0100] Then, in step S19, when the control to tilt the hospital bed 23 is not executed (step S19: No), and after step S23, the hospital bed control process according to the present embodiment is terminated.

[0101] As described above, in the X-ray diagnostic system 1 according to the present embodiment, when the X-ray diagnostic apparatus 10 detects that the gas A1 has entered the blood vessel of the subject P by detecting the gas A1 depicted on the contrast X-ray image of the subject P, it notifies the information indicating that the gas A1 has entered, notifies the information prompting to stop the injection of the contrast agent CON into the subject P, and when executing the control to tilt the hospital bed 23, it tilts the hospital bed 23. Therefore, similar to the above-described first embodiment, it supports the operator so that the response after gas mixing can be smoothly performed, and the risk of developing embolism associated with gas mixing can be reduced.

[0102] Note that the description of the above-described fourth embodiment is an explanation when applied to the first embodiment, but it is obvious that the fourth embodiment is also applicable to the second and third embodiments.

[0103] [Modifications of the First to Fourth Embodiments] The notification functions 283, 283a, and 283b of the X-ray diagnostic apparatus 10 according to the first to fourth embodiments described above are configured to notify various types of information via the first display 24. However, the notification functions 283, 283a, and 283b are not limited to notifying various types of information via the first display 24. For example, the notification functions 283, 283a, and 283b may notify information via the second display 27. Further, if the X-ray diagnostic apparatus 10 is further provided with a speaker, the notification functions 283, 283a, and 283b may notify various types of information as sound via the speaker.

[0104] Also, the X-ray diagnostic apparatus 10 according to the first to fourth embodiments described above is not limited to a cardiovascular X-ray diagnostic apparatus having two imaging systems with a biplane structure. For example, it can be realized as an arbitrary type of X-ray diagnostic apparatus such as a cardiovascular X-ray diagnostic apparatus having one imaging system with a single-plane structure, an X-ray CT apparatus, an X-ray TV examination table, or the like.

[0105] Note that the term "processor" used in the above description means, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or a circuit such as an application specific integrated circuit (ASIC), a programmable logic device (e.g., a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA)). The processor realizes its functions by reading and executing the program stored in the memory 25. Instead of storing the program in the memory 25, the program may be directly incorporated into the circuit of the processor. In this case, the processor realizes its functions by reading and executing the program incorporated in the circuit. Note that the processor is not limited to being configured as a single processor circuit, and a plurality of independent circuits may be combined to form one processor to realize its functions. Further, a plurality of components in FIGS. 2, 8, 11, and 14 may be integrated into one processor to realize its functions.

[0106] As described above, several embodiments have been described. However, these embodiments are presented only as examples and are not intended to limit the scope of the invention. The novel devices and methods described in this specification can be implemented in various other forms. Also, various omissions, substitutions, and changes can be made to the forms of the devices and methods described in this specification without departing from the gist of the invention. The scope of the appended claims and equivalents thereof are intended to include such forms and modifications included in the scope and gist of the invention.

Explanation of Reference Numerals

[0107] 1…X-ray diagnostic system, 10…X-ray diagnostic apparatus, 11…X-ray high voltage apparatus, 12…first X-ray tube, 13…first X-ray collimator, 14…first X-ray detector, 15…first arm, 16…first arm support, 17…second X-ray tube, 18…second X-ray collimator, 19…second X-ray detector, 20…second arm, 21…second arm support, 22…arm drive unit, 23…bed, 24…first display, 25…memory, 26…input interface, 27…second display, 28…processing circuit, 30, 30a…injector, 31…injector body, 32…syringe, 33…extension tube, 34…gas mixing detection unit, 161…first arm holder, 162…first support column, 163…floor turning unit, 211…second arm holder, 212…second support column, 231…base, 232…bed drive unit, 233…top plate, 234…support frame, 281, 281a…detection function, 282, 282a…bed control function, 283, 283a, 283b…notification function, 284…transmission function, 285…imaging control function, 286…image generation function, 287…derivation function

Claims

1. A detection unit that detects the entry of gas into the blood vessels of a subject, and a bed control unit that, when detecting the entry of the gas, controls the bed to tilt the bed so as to avoid gas mixing into the head of the subject. An X-ray diagnostic apparatus comprising the above.

2. The bed control unit controls the bed to tilt the bed so that at least the left side of the head of the subject is lower than the right foot of the subject. The X-ray diagnostic apparatus according to claim 1.

3. The bed control unit controls the bed to tilt the bed so that the head of the subject is lower than the feet of the subject. The X-ray diagnostic apparatus according to claim 1.

4. The bed control unit controls the bed to tilt the bed so that the left half of the subject's body is lower than the right half of the subject's body. The X-ray diagnostic apparatus according to claim 1.

5. The X-ray diagnostic apparatus according to claim 1, further comprising a notification unit that, when detecting the entry of the gas, notifies information indicating that gas has entered the blood vessels of the subject.

6. The notification unit according to claim 5 notifies information indicating that gas has entered the blood vessels of the subject and notifies information indicating that control to tilt the bed is to be executed. The X-ray diagnostic apparatus according to claim 5.

7. The notification unit according to claim 5 notifies information indicating that gas has entered the blood vessels of the subject and notifies information for confirming whether or not to execute control to tilt the bed. The X-ray diagnostic apparatus according to claim 5.

8. The notification unit according to claim 5 notifies information indicating that gas has entered the blood vessels of the subject and notifies information prompting to stop the injection of a contrast agent into the subject. The X-ray diagnostic apparatus according to claim 5.

9. The X-ray diagnostic apparatus according to claim 1, further comprising a transmission unit that, when detecting the entry of the gas, transmits a stop signal for stopping the injection of the contrast agent to an injection control device that controls the injection of the contrast agent into the subject.

10. The detection unit detects the entry of the gas by receiving a gas mixing notification, which is a notification regarding the entry of gas into the blood vessels of the subject, from an injection control device that controls the injection of a contrast agent into the subject. The X-ray diagnostic apparatus according to claim 1.

11. The X-ray diagnostic apparatus according to claim 1, wherein the detection unit detects that the gas has entered by detecting the gas depicted on the contrast X-ray image of the subject.

12. The X-ray diagnostic apparatus according to claim 1, further comprising a derivation unit that derives the time until the hospital bed is tilted based on at least one of the flow rate of the contrast agent and the distance from the injection position of the contrast agent to the head of the subject.

13. The X-ray diagnostic apparatus according to claim 9 or claim 10, wherein the contrast agent is a positive contrast agent or a gas contrast agent.

14. An injection control device for controlling the injection of a contrast agent into a subject; A detection unit that detects that gas has entered the blood vessel of the subject when the contrast agent is injected into the blood vessel of the subject by the injection control device; An X-ray diagnostic apparatus comprising: a hospital bed control unit that, when it is detected that the gas has entered, controls the hospital bed to tilt the hospital bed so as to avoid gas mixing into the head of the subject. and An X-ray diagnostic system comprising the same.

15. A step of detecting that gas has entered the blood vessel of the subject; A step of, when it is detected that the gas has entered, controlling the hospital bed to tilt the hospital bed so as to avoid gas mixing into the head of the subject. A control method for an X-ray diagnostic apparatus comprising the same.

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