JP2008237684A - X-ray imaging apparatus and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray imaging apparatus and its control method capable of controlling an unnecessary exposure when the visual axis of an operator is non-turned on a display device, preferably, easily reflecting the intention of the operator while reducing a complicated operation by the operator. <P>SOLUTION: This X-ray imaging apparatus 11 is provided with a management section 111, a communication section 112, an operation section 113, an X-ray exposure control section 114, an X-ray generation section 115, an X-ray imaging section 116, an image processing section 117 and an image display section 118. The communication section 112 communicates with an external device (now shown) for executing information management and the like in a hospital. The communication section 112 has a gaze information receiving section 1121, and the gaze information receiving section 1121 receives a determination signal of gazing a display device (a gaze detection signal) determined by a gaze detection device 12. That is to say, the gaze information receiving section 1121 detects whether the visual axis is turned on the display device 13 or not based on the determination signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an X-ray image capturing apparatus suitable for image diagnosis such as X-ray image diagnosis and a control method thereof.

  Conventionally, when performing fluoroscopy or video imaging using an X-ray imaging device in a medical field, generally, the control of X-ray exposure is the operation of a person who performs a medical practice (hereinafter referred to as an operator), It is performed by a radiologist who assists the surgeon.

  When the X-ray imaging apparatus is used during surgery, the surgeon holds the surgical instrument in his hand, and thus must maintain cleanliness. In view of this, in particular, in an X-ray imaging apparatus used for surgical support applications, the form of the exposure switch is often a foot pedal type. In the case of a foot pedal type exposure switch, X-ray exposure is performed while the operator is stepping on the foot pedal.

  FIG. 10 is a flowchart showing the operation of the conventional X-ray imaging apparatus. The conventional X-ray imaging apparatus is first stopped in step S1001. In the subsequent step S1002, when there is an instruction for exposure by the operator, X-ray exposure is executed in step S1003. As long as the instruction for exposure continues, X-ray exposure is also continued.

  On the other hand, during the operation, the operator must pay attention to other measuring devices in order to grasp information such as blood pressure and electrocardiogram, and cannot always watch the fluoroscopic image of the X-ray imaging apparatus. Absent.

  In order to reduce patient exposure during X-ray imaging, X-ray exposure is stopped during the period when the operator is gazing at other measuring equipment, that is, during the period when the fluoroscopic image of the X-ray imaging apparatus is not gazing. It is desirable to do. In principle, if you stop stepping on the foot pedal each time the surgeon gazes at another measuring device, you can easily stop the exposure. However, every time the other measuring device is watched, the operation of the foot pedal is required, and the concentration on the original medical practice may be lost. In such a system, in order to avoid a lack of concentration, the operator can avoid the complicated operation of the foot pedal, and the exposure can be performed regardless of whether or not the operator is gazing at the fluoroscopic image. In the end, the exposure dose of the patient increases due to unnecessary exposure.

  Patent Document 1 describes a technique for improving operability of an exposure operation and suppressing patient exposure in an X-ray imaging apparatus. In this technique, a radio wave switch is used instead of a foot pedal. Specifically, the surgeon's gaze direction and head direction are considered to be substantially equivalent, radio wave communication is performed between the head and the display device, and exposure is performed while communication is established. Is going to do. At this time, by transmitting radio waves having directivity only to the front surface of the display device, communication is established only when the surgeon and the display device face each other. Thereby, the presence or absence of the operator's gaze on the display device is determined, and exposure is performed only when the operator faces the display device.

Japanese Patent Laid-Open No. 9-24042

  However, the conventional technique described in Patent Document 1 has the following problems.

  For example, since the on / off of exposure with the foot pedal is simply replaced with switching according to the orientation of the display device and the operator's head, the operator's head is exposed only to the display device. Shooting is done. Actually, the fact that the surgeon's head is directly facing the display device does not necessarily instruct exposure, so there is a high possibility that unnecessary exposure will occur.

  In addition, since radio wave directivity is used, communication cannot be established unless the surgeon faces the display device. In other words, when the directivity of radio waves is increased, even if the surgeon is facing the display device, it may not be exposed unless it is strictly facing. As a result, exposure is likely to stop against the surgeon's will.

  In addition, since the direction of the surgeon's head and the direction of the line of sight are not necessarily the same, when the radio wave transmitting / receiving device is mounted on the head, as long as the surgeon is directly facing the display device, Even when the line of sight is not facing the display device, the exposure may continue.

  Furthermore, since many devices are arranged in the operating room, it is difficult to arrange the display device so that the operator and the display device always face each other.

  The present invention can suppress unnecessary exposure when the operator's line of sight is not directed to the display device, and preferably reflects the operator's intention easily while reducing complicated operations by the operator. It is an object of the present invention to provide an X-ray imaging apparatus that can be operated and a control method thereof.

  As a result of intensive studies to solve the above problems, the present inventor has come up with various aspects of the invention described below.

  The X-ray imaging apparatus according to the present invention includes gaze detection means for detecting whether or not a person who has arbitrarily set display means for displaying an X-ray image captured by the imaging means, and the gaze detection described above. And a control unit that limits a dose of radiation exposed from the exposure unit toward the imaging unit when it is detected that the device is not gazing.

  The control method of the X-ray imaging apparatus according to the present invention includes a gaze detection step of detecting whether or not a person who has arbitrarily set display means for displaying an X-ray image captured by the imaging means is gaze- And a control step of limiting a dose of radiation exposed from the exposure means toward the image pickup means when it is detected that no gaze is detected in the gaze detection step.

  The program according to the present invention includes a gaze detection step for detecting whether or not a person who has arbitrarily set display means for displaying an X-ray image captured by the imaging means on a computer, and the gaze detection step. When it is detected that no gaze is detected, a control step for limiting the dose of radiation emitted from the exposure means toward the imaging means is executed.

  According to the present invention, since the exposure condition in the exposure means is determined according to the detection result by the gaze detection means and the exposure instruction, the exposure not required by the operator is suppressed, and the patient exposure Can be reduced. In addition, since the exposure is controlled according to the detection result by the gaze detection means, the operation for stopping the exposure that is conventionally required for the operator to view other measuring devices should be omitted. This also makes it easier for the surgeon to concentrate on the original medical practice.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 is a functional block diagram showing a configuration of an X-ray image capturing apparatus according to an embodiment of the present invention. FIG. 2 is a diagram showing an X-ray image diagnosis system including an X-ray image capturing apparatus.

  As shown in FIG. 2, the X-ray image diagnostic system includes an X-ray image imaging device 11 that performs X-ray imaging of a patient, a display device 13 that displays a captured X-ray image, and an operator's line of sight. Is composed of a gaze detection device 12 that detects whether or not the screen is facing the display device 13. The surgeon to be detected can be arbitrarily set in advance.

  The X-ray image capturing apparatus 11 (X-ray image capturing apparatus) according to the present embodiment is a C-arm type apparatus as shown in FIG. 2, for example, but is not limited thereto. As shown in FIG. 1, the X-ray imaging apparatus 11 includes a management unit 111, a communication unit 112, an operation unit 113, an X-ray exposure control unit 114, an X-ray generation unit 115, an X-ray imaging unit 116, and image processing. A unit 117 and an image display unit 118 are provided.

  Although not shown, the management unit 111 is connected to each unit in the X-ray imaging apparatus 11 and controls each unit.

  The communication unit 112 communicates with an external device (not shown) that performs information management in the hospital. The communication unit 112 is provided with a gaze information receiving unit 1121. The gaze information receiving unit 1121 receives a display device gaze determination signal (gaze detection signal) determined by the gaze detection device 12 illustrated in FIG. To do. That is, the gaze information receiving unit 1121 detects whether or not the line of sight is directed to the display device 13 based on the determination signal.

  The operation unit 113 receives a surgeon's operation. The operation unit 113 displays the states of the X-ray exposure instruction unit 1131 for instructing the execution of X-ray exposure, the X-ray dose adjustment unit 1132 for adjusting the X-ray dose, and the X-ray imaging apparatus 11. A display portion 1133 is provided. The X-ray exposure instruction unit 1131 includes a switch for the operator to give an X-ray exposure instruction to the X-ray imaging apparatus 11, for example, a foot pedal of the C-arm type apparatus shown in FIG. Then, the X-ray exposure instruction unit 1131 determines that the operation of the switch (stepping on the foot pedal) is an input of an exposure instruction by the operator, and generates an exposure instruction signal.

  The X-ray exposure control unit 114 determines X-ray generation conditions and controls the tube voltage, tube current, and pulse width applied to the X-ray generation unit 115. The X-ray exposure control unit 114 includes a timer 1141 and can perform exposure control according to a predetermined time.

  The X-ray generation unit 115 is provided with an X-ray generation tube 1151, and the X-ray generation tube 1151 generates X-rays as radiation based on control by the X-ray exposure control unit 114.

  The X-ray imaging unit 116 detects X-rays that are exposed by the X-ray generation unit 115 and transmitted through the subject, and acquires a fluoroscopic image.

  The image processing unit 117 performs processing such as noise reduction and gain adjustment on the X-ray image data acquired by the X-ray imaging unit 116 as necessary.

  The image display unit 118 causes the display device 13 to display the X-ray image processed by the image processing unit 117.

  As shown in FIG. 2, a gaze detection device 12 and a display device 13 are connected to the X-ray imaging device 11.

  The display device 13 displays a fluoroscopic image or the like captured by the X-ray image capturing device 11.

  The gaze detection device 12 is installed in the vicinity of the display device 13 and detects the direction of the operator's gaze point existing within a predetermined range. The gaze detection device 12 transmits the determination result as a gaze detection signal to the X-ray imaging device 11. The gaze detection signal is a binary or higher signal indicating whether or not the operator is in a gaze state. The method for determining whether or not the user is in a gaze state is not limited, and a known face detection method and a method for detecting a line of sight from the detected face can be employed. For example, it is possible to employ the technology of a vehicle sideways driving prevention device described in JP-A-8-207617.

  In the medical field, as shown in FIG. 2, various measuring devices 201 that measure the movement of the patient's heart on the bed 203 are arranged. Further, the display device 13 and the gaze detection device 12 are placed on the cart 202.

  Next, the operation of the X-ray imaging apparatus 11 will be described. In the present embodiment, the X-ray exposure control unit 114 receives the exposure instruction signal from the X-ray exposure instruction unit 1131 and the gaze detection signal from the gaze information reception unit 1121, and according to the combination and transition thereof, The state of the line image capturing device 11 is determined. Then, the X-ray exposure control unit 114 generates a tube voltage, a tube current, and an exposure pulse width corresponding to the determined state, and controls the X-ray generation unit 115.

  FIG. 5 is a state transition diagram showing a state transition of the X-ray imaging apparatus 11 in the first embodiment. In the present embodiment, the normal mode 501, the low-dose mode 502, the forced exposure mode 503, the stop state 504, and the idling state 505 are set as states that can be determined by the X-ray exposure control unit 114. The idling state 505 is a state at the time of starting and ending, and no exposure is performed in the idling state 505. The stop state 504 is a state in which the exposure is stopped, and no exposure is performed in the stop state. The normal mode 501 is a state in which exposure is performed under the exposure conditions used in the original medical practice. The low-dose mode 502 is a state in which exposure is performed at a dose lower than that in the normal mode 501 or exposure is stopped. The forced exposure mode 503 is a state in which exposure is performed for a predetermined time under the same exposure conditions as the normal mode 501 regardless of the state of the gaze detection signal. Here, the predetermined time is a time set in advance by an operator, a radiologist, or an administrator.

  Next, a method for determining the state by the X-ray exposure control unit 114 will be described. FIG. 3 is a flowchart showing the operation of the X-ray exposure control unit 114 when determining the exposure conditions in the first embodiment, and FIG. 4 shows a transition from the normal mode 501 in the first embodiment. It is a flowchart which shows operation | movement of the X-ray exposure control part 114 of.

  First, when the X-ray image capturing apparatus 11 is turned on, the X-ray image capturing apparatus 11 prepares a state in which fluoroscopy can be performed. At this time, the X-ray exposure control unit 114 changes the state from the idling state 505 to the stop state 504 in step S301. In the stop state 504, the X-ray exposure control unit 114 can receive an exposure instruction signal, and the operator can perform an exposure operation via the X-ray exposure instruction unit 1131.

  Next, in step S302, the X-ray exposure control unit 114 determines the presence or absence of an exposure instruction from the operator from the exposure instruction signal. The X-ray exposure control unit 114 proceeds to step S303 only when it is determined that there is an exposure instruction from the operator, for example, when it is determined that there is a foot pedal depression. Therefore, exposure is not performed unless the operator gives an exposure instruction by stepping on the foot pedal.

  In step S303, the X-ray exposure control unit 114 determines the display device gaze on the display device 13 of the surgeon according to the gaze detection signal.

  If it is determined that there is a display device gaze, in step S304, the X-ray exposure control unit 114 changes the state to the normal mode 501 and performs exposure under the exposure conditions used in the original medical practice. Implement control. That is, when there is an exposure instruction and there is a display device gaze, the X-ray exposure control unit 114 causes the X-ray generation unit 115 to perform normal exposure.

  On the other hand, if it is determined that there is no display device gaze, in step S305, the X-ray exposure control unit 114 changes the state to another operation mode. In the present embodiment, the X-ray exposure control unit 114 first makes a transition to the low dose mode described below.

  In transition from the normal mode 501, as shown in FIG. 4, the X-ray exposure control unit 114 first passes through the X-ray exposure instruction unit 1131 in step S 401 in a state where the display device is not being watched. Determine if the surgeon is giving instructions for re-exposure. Examples of the method for re-exposing the exposure include a method of quickly depressing the foot pedal or a method of deeply depressing the foot pedal having a two-stage switch.

  If it is determined that there is an exposure re-instruction, the X-ray exposure control unit 114 starts measuring the elapsed time from the time when the exposure re-instruction is set by the timer 1141. For this reason, in step S402, the X-ray exposure control unit 114 resets the timer 1141, and uses the timer 1141 to measure the elapsed time after detecting the exposure re-instruction.

  On the other hand, if it is determined that there is no re-instruction for exposure, the X-ray exposure control unit 114 changes the state to the low-dose mode 502 in step S403. Then, the X-ray exposure control unit 114 performs X-ray exposure control so as to limit the X-ray generation unit 115 to a predetermined dose lower than that in the normal mode. In step S403, the exposure may be stopped as one form of limiting the dose.

  After step S402, in step S404, the X-ray exposure control unit 114 determines whether the exposure instruction is continued based on the exposure instruction signal. If the exposure instruction is not continued, the exposure is stopped. That is, if the exposure instruction is not continued, the process proceeds to the stop state in step S301 after the determination in step S302. For example, when the operator stops stepping on the foot pedal immediately after giving an exposure re-instruction, the exposure is not executed.

  On the other hand, if it is determined that the exposure instruction continues, the X-ray exposure control unit 114 changes the state to the forced exposure mode 503 in step S405. In the forced exposure mode 503, the restriction on the X-ray dose is released regardless of whether or not the display device is watched, and under the same conditions as the exposure conditions in the normal mode 501 (that is, the same dose as in the normal mode). Control exposure.

  Thereafter, in step S406, the X-ray exposure control unit 114 determines that the elapsed time since the timer 1141 detected the exposure re-instruction, that is, the elapsed time since the timer 1141 was reset in step S402 is a predetermined time. It is judged whether it has reached. If the elapsed time has reached the predetermined time, the process of forced exposure mode 503 is terminated, the process of low dose mode 502 is terminated, and the process returns to step S302. On the other hand, if the predetermined time has not been reached, the process returns to step S404.

  Therefore, in this embodiment, even if the state transitions to the low-dose mode 502 due to erroneous detection by the gaze detection device 12 or the like, if the operator re-instructs the exposure, the state is the forced exposure mode 503. Transition to. Irrespective of whether or not the display device is watched, exposure is performed with a dose of X-rays equivalent to that in the normal mode 501 for a predetermined period.

  Here, changes in the exposure pulse based on the virtual exposure instruction signal and the gaze detection signal will be described. FIG. 6 is a time chart showing a virtual exposure instruction signal, a gaze detection signal, and changes in the exposure pulse based thereon. In FIG. 6, “exposure instruction (foot pedal depression)” indicates an exposure instruction signal, and a high (Hi) indicates that there is an exposure instruction. “Display device gaze” indicates a gaze detection signal, and its high (Hi) indicates that there is a display device gaze.

  First, at an elapsed time t1, it is assumed that an exposure instruction is given by the operator and the operator gazes at the display device 13. In this case, in step S304, the X-ray exposure control unit 114 controls the exposure in the normal mode 501.

  It is assumed that the surgeon no longer gazes at the display device 13 although the exposure instruction by the surgeon continues at the elapsed time t2 thereafter. In this case, in step S403, the X-ray exposure control unit 114 controls the exposure in the low dose mode 502.

  It is assumed that the surgeon gazes at the display device 13 again at the subsequent elapsed time t3 while the exposure instruction by the surgeon continues. In this case, in step S304, the X-ray exposure control unit 114 controls the exposure in the normal mode 501.

  At the subsequent elapsed time t4, it is assumed that the re-exposure instruction by the quick re-stepping of the foot pedal is performed in a state where the exposure in the low-dose mode 502 is performed. In this case, the X-ray exposure control unit 114 controls the exposure in the forced exposure mode 503 from the elapsed time t5 after resetting the timer 1141 in step S402. Therefore, X-ray exposure with the same X-ray dose as in the normal mode 501 is performed regardless of whether or not the display device is watched until a predetermined time elapses or until the exposure instruction is interrupted.

  According to the first embodiment, it is possible to prevent the patient from being exposed more than necessary without forcing the operator to perform a complicated exposure operation. Further, since there is no exposure instruction when there is no exposure instruction, the possibility that the exposure will be performed against the will of the operator is extremely low.

  In addition, since it is determined whether or not the operator is gazing at the display device 13 using the detection result of the gaze detection device 12, it is affected by the arrangement of the display device 13 and the orientation of the operator's head. Therefore, the intention of the surgeon can be accurately reflected.

  Further, the X-ray exposure control unit 114 allows the operator to perform the exposure even when the gaze detection device 12 cannot correctly detect the gaze while the operator gazes at the display device 13. If re-instruction is performed, the state is changed to the forced exposure mode 503. For this reason, if the surgeon has an intention of exposure, the exposure can be reliably continued. Further, when the operator is in the low-dose mode 502, even if the operator gazes at the display device 13, the exposure in the normal mode 501 is not resumed promptly, and a delay may occur. Even in such a case, if the operator gives an exposure re-instruction before returning to the gaze state, the state transitions to the forced exposure mode 503, so that such a delay can be suppressed.

  Note that the exposure conditions in each state determined by the X-ray exposure control unit 114 may be transferred to the image processing unit 117. In this case, the image processing unit 117 may change the image processing to be performed based on the delivered exposure conditions. In addition, in each of the normal mode 501, the low-dose mode 502, and the forced exposure mode 503, the processing applied to the X-ray image may be changed.

  In addition, the gaze detection device 12 does not necessarily have to be installed near the display device 13. For example, an operator may wear the gaze detection device 12. In this case, the gaze detection device 12 detects the direction of the operator's line of sight, for example. Further, a head-mounted display device having a line-of-sight detection mechanism may be used as the gaze detection device 12.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the second embodiment, the exposure conditions in the low-dose mode 502 are different from those in the first embodiment. That is, in the first embodiment, the exposure is performed at a dose lower than the X-ray dose in the normal mode 501 or the exposure is stopped. In the second embodiment, the exposure is stopped. In the low-dose mode 502, the X-ray dose is reduced as time passes. FIG. 7 is a flowchart showing the operation of the X-ray exposure control unit 114 in the low-dose mode 502 in the second embodiment.

  In this embodiment, when it is determined in step S401 that there is no exposure re-instruction, the X-ray exposure control unit 114 resets the timer 1141 in step S701, and uses the timer 1141 to determine from the determination in step S401. Measure elapsed time.

  Next, in step S702, the X-ray exposure control unit 114 determines whether or not the exposure instruction is continued based on the exposure instruction signal. If the exposure instruction is not continued, the exposure is stopped. That is, if the exposure instruction is not continued, the process proceeds to the stop state in step S301 after the determination in step S302.

  On the other hand, when it is determined that the exposure instruction is continued, the X-ray exposure control unit 114, in step S703, the X-ray exposure control unit 114 sends to the operator's display device 13 according to the gaze detection signal. Judgment of the display device.

  If it is determined that there is a display device gaze, the process proceeds to the normal mode 501 in step S304 through the determinations in steps S302 and S303.

  On the other hand, if it is determined that there is no display device gaze, in step S704, the X-ray exposure control unit 114 determines a dose according to the elapsed time measured by the timer 1141 in accordance with a predetermined condition. To do. FIG. 8 is a graph showing an example of the predetermined condition. In the example illustrated in FIG. 8, the X-ray exposure control unit 114 performs the irradiation with the dose S until the elapsed time after transitioning to the low dose mode 502 reaches t11, and then the elapsed time t12. The dose is reduced at a constant rate until Then, when the elapsed time reaches t12, the exposure is stopped. Here, the dose S is an X-ray dose equivalent to that in the normal mode 501, for example.

  In step S705, the X-ray exposure control unit 114 performs X-ray exposure control of the X-ray generation unit 115 based on the X-ray dose determined in step S704.

  According to the second embodiment as described above, not only simple dose reduction and / or exposure stop but also stepwise dose adjustment is possible. In addition to the same effects as those of the first embodiment, With reduced exposure, operability with less discomfort is realized.

  The X-ray dose in the low dose mode 502 is not limited to that shown in FIG. For example, the exposure dose may be gradually decreased at a constant rate as compared with the dose in the normal mode 501 after the transition to the low dose mode 502.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first and second embodiments, when the surgeon gazes from the state where the display device 13 is not gazed, there may be a delay between the transition to the normal mode 501 and the start of imaging in the normal mode 501. . In the third embodiment, such a delay is suppressed.

  That is, in the first and second embodiments, the gaze detection device 12 determines that the display device is being watched when the operator's line of sight is within the outer edge of the display device 13. Therefore, in the third embodiment, in order to suppress the above-described delay, a fixed range around the display device 13 is set as a gaze detection range 901 as shown in FIG. When there is a person's line of sight, it is determined that the display device is being watched. This is because the detection when the operator's line of sight returns to the display device 13 is performed at an early stage, and the apparent delay can be suppressed. In this case, the size of the gaze detection range 901 can be set according to the degree of delay of the X-ray image capturing apparatus 11, the operating room environment, the usage, and the like. However, if too much emphasis is placed on delay suppression and the gaze detection range 901 is set too large, it is difficult to detect that the operator's line of sight has deviated from the display device 13.

  Therefore, in the third embodiment, as shown in FIG. 9 b, the first gaze detection range 902 that is a reference when the operator's line of sight deviates from the display device 13, and the operator's line of sight returns to the display device 13. A second gaze detection range 903 is set as a reference when coming. When the line of sight moves from the gaze detection range 902 to the outside, the gaze detection device 12 sets the gaze detection signal to “non-gaze”, and the line of sight moves from the outside of the gaze detection range 903 to the inside of the gaze detection range 903. It is set that the gaze detection signal is set to “gaze” when moving. The gaze detection signal is also set to “gazing” when the gaze returns to the gaze detection range 902 without moving to the outside of the gaze detection range 903 after moving from the gaze detection range 902 to the outside. .

  According to the third embodiment, it is possible to predict that the line of sight returns to the inside of the display device 13 with reference to the second gaze detection range 903, and the transition to the normal mode 501 and the normal mode are performed. The delay until the start of imaging at 501 can be suppressed. For this reason, an exposure re-instruction by an operator for avoiding a delay is unnecessary, and operability can be improved. In addition, it can be prevented that it is difficult to detect that the operator's line of sight has deviated from the display device 13.

  Note that the gaze detection signal may be three or more, the gaze information receiving unit 1121 may receive gaze position information from the gaze detection device 12, and the X-ray exposure control unit 114 may perform gaze determination and prediction processing. Moreover, if the transition to the display device gaze state can be predicted, for example, a method of detecting the moving direction of the line of sight from the movement of the line of sight may be employed.

  The embodiment of the present invention can be realized by, for example, a computer executing a program. Also, means for supplying a program to a computer, for example, a computer-readable recording medium such as a CD-ROM recording such a program, or a transmission medium such as the Internet for transmitting such a program is also applied as an embodiment of the present invention. Can do. The above program can also be applied as an embodiment of the present invention. The above program, recording medium, transmission medium, and program product are included in the scope of the present invention.

It is a functional block diagram which shows the structure of the X-ray imaging device which concerns on embodiment of this invention. It is a figure which shows an X-ray image diagnostic system. It is a flowchart which shows operation | movement of the X-ray exposure control part 114 at the time of determining exposure conditions in 1st Embodiment. 6 is a flowchart showing the operation of the X-ray exposure control unit 114 when transitioning from a normal mode 501 in the first embodiment. It is a state transition diagram which shows the state transition of the X-ray image imaging device 11 in 1st Embodiment. It is a time chart which shows the change of the exposure pulse based on a virtual exposure instruction | indication signal and a gaze detection signal, and this. It is a flowchart which shows operation | movement of the X-ray exposure control part 114 in the low dose mode 502 in 2nd Embodiment. It is a graph which shows the relationship between the exposure dose in the low dose mode 502 in 2nd Embodiment, and elapsed time. It is a figure which shows the relationship between a gaze detection range and a display apparatus. It is a figure which shows the relationship between two types of gaze detection ranges and a display apparatus. It is a flowchart which shows operation | movement of the conventional X-ray image imaging device.

Explanation of symbols

11: X-ray imaging device 12: Eye detection sensor 13: Display device 111: Management unit 112: Communication unit 1121: Gaze information receiving unit 113: Operation unit 1131: X-ray exposure instruction unit 1132: X-ray dose adjustment unit 1133: Display unit 114: X-ray exposure control unit 1141: Timer 115: X-ray generation unit 1151: X-ray generation tube 116: X-ray imaging unit 117: Image processing unit 201: Measuring device 202: Cart 203: Bed

Claims (5)

Gaze detection means for detecting whether or not a person who has arbitrarily set the display means for displaying the X-ray image captured by the imaging means,
Control means for limiting the dose of radiation exposed from the exposure means toward the imaging means when it is detected that the gaze detection means is not gazing;
An X-ray imaging apparatus characterized by comprising:   The control means causes the exposure means to perform exposure when it is detected that the line of sight is directed to the display means by the gaze detection means and there is an instruction for exposure by the instruction means. The X-ray imaging apparatus according to claim 1.   When the exposure instruction is received again in the state where the exposure instruction is given, the control means determines the dose of the radiation exposed from the exposure means regardless of the detection result by the gaze detection means. The X-ray imaging apparatus according to claim 1, wherein the restriction is released. A method for controlling an X-ray imaging apparatus comprising:
A gaze detection step of detecting whether or not a person who has arbitrarily set display means for displaying an X-ray image captured by the imaging means is gaze-
A control step of limiting the dose of radiation exposed from the exposure means toward the imaging means when it is detected that no gaze is detected in the gaze detection step;
A control method for an X-ray imaging apparatus, comprising: A program for causing a computer to execute control of an X-ray imaging apparatus,
In the computer,
A gaze detection step of detecting whether or not a person who has arbitrarily set display means for displaying an X-ray image captured by the imaging means is gaze-
A control step of limiting the dose of radiation exposed from the exposure means toward the imaging means when it is detected that no gaze is detected in the gaze detection step;
A program characterized in that is executed.

Images