JP2018183274A - X-ray diagnostic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability of an examination in an X-ray diagnostic apparatus by enabling imaging in a short time subsequent to a pulse fluoroscopy.SOLUTION: An X-ray diagnostic apparatus includes: an X-ray tube for irradiation with an X-ray; an X-ray detector for detecting the X-ray; voltage supply means for supplying a voltage to the X-ray tube and executing control for irradiation with the X-ray from the X-ray tube; first input means for receiving an operation to perform a fluoroscopy by the X-ray; second input means for receiving an operation to transition an X-ray condition related to the fluoroscopy to an X-ray condition related to imaging by the X-ray; and third input means for receiving an operation to perform the imaging.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an X-ray diagnostic apparatus.

  The X-ray diagnostic apparatus is intended to set an imaging direction, an imaging region, and an X-ray condition in imaging prior to X-ray imaging (hereinafter simply referred to as “imaging”) for the purpose of generating an image used for diagnosis. X-ray fluoroscopy (hereinafter simply referred to as “fluoroscopy”). Here, fluoroscopy is roughly divided into continuous fluoroscopy and pulse fluoroscopy. Pulse fluoroscopy means a fluoroscopy method in which X-ray pulses are intermittently and repeatedly irradiated, unlike continuous fluoroscopy. According to pulse fluoroscopy, the continuity (frame rate) of fluoroscopic images is slightly inferior to continuous fluoroscopy, but the exposure dose to the patient can be suppressed.

  In imaging, X-ray conditions different from pulse fluoroscopy are set. Under X-ray conditions in pulse fluoroscopy, the tube current is set low to protect the filament and target of the X-ray tube. Therefore, in the conventional X-ray diagnostic apparatus, when switching from pulse fluoroscopy to radiography, after X-ray irradiation by pulse fluoroscopy is stopped, it takes time to prepare for radiography to obtain X-ray conditions for radiography. .

JP 2011-147615A

  The problem to be solved by the present invention is to provide an X-ray diagnostic apparatus capable of improving examination operability by enabling imaging to be performed in a short time following pulse fluoroscopy.

  The X-ray diagnostic apparatus according to the present embodiment includes an X-ray tube that irradiates X-rays, an X-ray detector that detects the X-rays, a voltage supplied to the X-ray tube, and the X-rays from the X-ray tube A voltage supply unit that controls to irradiate, a first input unit that receives an operation for performing fluoroscopy with the X-ray, and an X-ray condition related to the fluoroscopy to an X-ray condition related to the X-ray imaging A second input unit that accepts an operation to make a transition; and a third input unit that accepts an operation to perform the shooting.

Schematic which shows the structure of the X-ray diagnostic apparatus which concerns on this embodiment. The perspective view which shows the external appearance structure of the holding | maintenance apparatus in the X-ray diagnostic apparatus concerning this embodiment. The figure which shows the example of the input device in the X-ray diagnostic apparatus which concerns on this embodiment. The figure which shows the example of the input device in the X-ray diagnostic apparatus which concerns on this embodiment. The figure which shows the test | inspection sequence in a prior art. The figure which shows the 1st test | inspection sequence in the X-ray diagnostic apparatus which concerns on this embodiment. The figure which shows the 2nd test | inspection sequence in the X-ray diagnostic apparatus which concerns on this embodiment. The figure which shows the operation | movement of the X-ray diagnostic apparatus which concerns on this embodiment as a flowchart. The figure which shows the operation | movement of the X-ray diagnostic apparatus which concerns on this embodiment as a flowchart. The figure which shows the 3rd test | inspection sequence in the X-ray diagnostic apparatus which concerns on this embodiment.

  An X-ray diagnostic apparatus according to this embodiment will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing the configuration of the X-ray diagnostic apparatus according to the present embodiment. FIG. 2 is a perspective view showing an external configuration of the holding device in the X-ray diagnostic apparatus according to the present embodiment.

  1 and 2 show an X-ray diagnostic apparatus 1 according to this embodiment. The X-ray diagnostic apparatus 1 is not limited to a digestive system X-ray diagnostic apparatus as shown in FIGS. 1 and 2, and may be a circulatory X-ray diagnostic apparatus. .

  The X-ray diagnostic apparatus 1 generally includes a holding device 11 and an image processing device 12. The image processing apparatus 12 is also called a DF (Digital Fluorography) apparatus. The holding device 11 is generally installed in a procedure room (examination / treatment room), while the image processing device 12 is installed in a control room adjacent to the procedure room.

  The holding device 11 having a C-arm structure includes a holding device body 21, a body frame 22, a top plate holding mechanism 23, a top plate 24, a C arm holding mechanism 25, a C arm 26, an X-ray irradiation device 27, an X-ray detection device 28, A control circuit 30, a high voltage supply device 31, and a power circuit 32 are provided. The C-arm holding device 11 will be described as an under tube type in which the X-ray irradiation device 27 is positioned below the top plate 24, but the overtube in which the X-ray irradiation device 27 is positioned above the top plate 24. It may be a type.

  The holding device body 21 is fixed to the floor.

  The body frame 22 is supported by the holding device main body 21. The body frame 22 supports the top plate holding mechanism 23 and the C arm holding mechanism 25 that supports the C arm 26. The body frame 22 is operated by the power circuit 32 so that the top plate holding mechanism 23, the top plate 24, the C arm holding mechanism 25, and the C arm 26 are integrally moved up and down (movement in the direction A in FIG. 2). It is possible to perform an upside-down movement (movement in the direction B in FIG. 2).

  The top plate holding mechanism 23 is cantilevered by the body frame 22. The top plate holding mechanism 23 is operated by the power circuit 32 to move the top plate 24 left and right (C-LAT: movement in the direction C in FIG. 2) relative to the body frame 22 or up and down (C-VERT). : Motion in the D direction in FIG. 2) or rolling (ROLL).

  The top plate 24 is supported by the top plate holding mechanism 23. The top plate 24 places the patient P thereon.

  The C arm holding mechanism 25 is supported by the body frame 22. The C arm holding mechanism 25 is operated by the power circuit 32, so that the C arm 26 can be slid in the long axis direction of the body frame 22 (C-LONG: movement in the E direction in FIG. 2).

  The C arm 26 makes the X-ray irradiation device 27 and the X-ray detection device 28 face each other with the patient P as the center. The C arm 26 is operated by the power circuit 32 to rotate around the attachment position with the C arm holding mechanism 25 (CRA / CAU: movement in the F direction in FIG. 2) or circular movement (LAO / RAO). : Motion in the G direction of FIG. 2).

  The X-ray irradiation device 27 is an example of an X-ray irradiation unit, and is provided at one end of the C arm 26. The X-ray irradiation device 27 can move back and forth (movement in the H direction in FIG. 2) by operating by the power circuit 32.

  The X-ray irradiation device 27 includes an X-ray tube. The X-ray tube receives supply of high voltage power from the high voltage supply device 31 and irradiates the subject, for example, a predetermined part of the patient P with X-rays from the X-ray tube according to the condition of the high voltage power. . The X-ray irradiation device 27 emits a predetermined amount of irradiated X-rays on the emission side of the X-ray tube in order to prevent halation formed by an X-ray irradiation field stop composed of a plurality of lead feathers, silicon rubber, or the like. A compensation filter for attenuation is provided. The X-ray irradiation device 27 can irradiate X-rays for imaging a predetermined part and X-rays for seeing through the predetermined part.

  The X-ray detection device 28 is provided at the other end of the C arm 26 and on the emission side of the X-ray irradiation device 27. The X-ray detection device 28 can move back and forth (movement in the I direction in FIG. 2) by operating with the power circuit 32.

  The X-ray detection device 28 includes an FPD (Flat Panel Detector) 281 and an A / D (Analog to Digital) conversion circuit 282.

  The FPD 281 is an X-ray detector having a plurality of detection elements arranged in two dimensions. Between the detection elements of the FPD 281, the scanning lines and the signal lines are arranged so as to be orthogonal to each other. A grid (not shown) may be provided on the front surface of the FPD 281. In order to improve the contrast of the X-ray image by absorbing the scattered radiation incident on the FPD 281, the grid is alternately arranged with a grid plate formed of lead or the like having a large X-ray absorption and easily transmitted aluminum or wood. Is done.

  The A / D conversion circuit 282 converts the projection data of the time-series analog signal (video signal) output from the FPD 281 into a digital signal and outputs the digital signal to the image processing device 12.

  The X-ray detection device 28 is an I.D. I. (Image Intensifier)-TV system may be used. I. I. -In the TV system, X-rays transmitted through the patient P and directly incident X-rays are converted into visible light, and the brightness is doubled in the process of light-electron-light conversion to form sensitive projection data. Then, optical projection data is converted into an electrical signal using a CCD (Charge Coupled Device) imaging device.

  The control circuit 30 includes a processing circuit and a storage circuit (not shown). The control circuit 30 controls operations of the high voltage supply device 31 and the power circuit 32 according to instructions from the image processing device 12. The control circuit 30 is a circuit that performs conditioning for moving the high voltage supply device 31, the power circuit 32, and the like under an instruction from the image processing device 12.

  The high voltage supply device 31 supplies high voltage power to the X-ray tube of the X-ray irradiation device 27 under the control of the control circuit 30. The high voltage supply device 31 controls the X-ray tube according to the X-ray condition in the pulse fluoroscopy, that is, the fluoroscopy condition. Here, the fluoroscopic conditions include tube voltage, tube current, irradiation time, and the like of each pulse in pulse fluoroscopy. The high voltage supply device 31 controls the X-ray tube in accordance with X-ray conditions in imaging, that is, imaging conditions. The imaging conditions include tube voltage, tube current, and X-ray pulse irradiation time in imaging.

  The power circuit 32 controls the X-ray irradiation device 27, the X-ray detection device 28, the C arm 26, the holding device body 21, the body frame 22, the top plate holding mechanism 23, and the C arm holding mechanism 25 according to the control of the control circuit 30. Drive.

  The image processing apparatus 12 is configured based on a computer, and is an apparatus that performs operation control of the entire X-ray diagnostic apparatus 1 and image processing related to an X-ray image (X-ray image data) acquired by the gantry apparatus 2. is there. The image processing apparatus 12 includes a processing circuit 41, a storage circuit 42, an image generation circuit 43, an image processing circuit 44, an input circuit 45, and a display 46.

  The processing circuit 41 means a processing circuit such as a dedicated or general-purpose CPU (Central Processing Unit) or MPU (Micro Processor Unit), an application specific integrated circuit (ASIC), and a programmable logic device. Examples of the programmable logic device include circuits such as a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA). The processing circuit 41 realizes a function to be described later by reading and executing a program stored in the storage circuit 42 or directly incorporated in the processing circuit 41.

  Further, the processing circuit 41 may be configured by a single processing circuit or may be configured by a combination of a plurality of independent processing circuits. In the latter case, the storage circuit 42 may include a plurality of storage circuits corresponding to the plurality of processing circuits, respectively, or the storage circuit 42 may include one storage circuit corresponding to the plurality of processing circuits. Also good.

  The storage circuit 42 includes a semiconductor memory device such as a random access memory (RAM) and a flash memory, a hard disk, and an optical disk. The storage circuit 22 may include a portable medium such as a USB (Universal Serial Bus) memory and a DVD (Digital Video Disk). The storage circuit 42 stores various processing programs (including an OS (Operating System) in addition to application programs) used in the processing circuit 41, data necessary for executing the programs, and X-ray images. In addition, the OS may include a GUI (Graphical User Interface) that uses a lot of graphics for displaying information on the display 46 for the operator D and can perform basic operations by the input circuit 45.

  The image generation circuit 43 performs logarithmic conversion processing (LOG processing) on the projection data output from the A / D conversion circuit 282 of the holding device 11 under the control of the processing circuit 41, and performs addition processing as necessary. X-ray image is generated.

  The image processing circuit 44 performs image processing on the X-ray image generated by the image generation circuit 43 under the control of the processing circuit 41. Examples of image processing include enlargement / gradation / spatial filter processing on data, minimum / maximum value tracing processing of data accumulated in time series, and addition processing for removing noise. Note that the data after image processing by the image processing circuit 44 is stored in the storage circuit 42.

  The input circuit 45 is a circuit for inputting a signal from an input device that can be operated by the operator D. Here, the input device itself is also included in the input circuit 45. The input device includes a switch, a pointing device (for example, a mouse), a keyboard, and various buttons. When the input device is operated by the operator D, the input circuit 45 generates an input signal corresponding to the operation and outputs it to the processing circuit 41. Note that the image processing apparatus 12 may include a touch panel in which an input device is integrated with the display 46.

  3 and 4 are diagrams illustrating examples of input devices in the X-ray diagnostic apparatus 1.

  FIG. 3 shows a handy type input device 45A which is an example of the input device 45 shown in FIG. The input device 45A includes a first input unit (for example, a fluoroscopic switch) SW1, a second input unit (for example, a shooting preparation switch) SW2, a third input unit (for example, a shooting switch) SW3, and a gripper H. Prepare. The first input unit, the second input unit, and the third input unit are not limited to switches.

  The input device 45A cannot press down (ON) the shooting preparation switch SW2 until the fluoroscopic switch SW1 is pressed (ON). The input device 45A presses down the shooting switch SW3 (only after the shooting preparation switch SW2 is pressed (ON)). ON) It has a multistage switch structure that cannot be used.

  The fluoroscopic switch SW1 of the input device 45A accepts an operation for performing general pulse fluoroscopy (hereinafter referred to as “simple pulse fluoroscopy”). The imaging preparation switch SW2 accepts an operation for changing an X-ray condition related to simple pulse fluoroscopy to an X-ray condition related to imaging. The photographing switch SW3 accepts an operation for performing photographing.

  When the operator presses the fluoroscopic switch SW1 of the input device 45A and gives a fluoroscopic instruction to the processing circuit 41, general pulse fluoroscopy (hereinafter referred to as “simple pulse fluoroscopy”) is started. When the operator has pressed the fluoroscopic switch SW1, that is, when the imaging preparation switch SW2 of the input device 45A is pressed during simple pulse fluoroscopy and the processing circuit 41 is instructed to perform imaging, simple pulse fluoroscopy is terminated. At the same time, pulse fluoroscopy (hereinafter referred to as “transition pulse fluoroscopy”) in which the tube current transitions to the tube current in imaging is started. When the imaging switch SW3 of the input device 45A is pressed during the transition pulse fluoroscopy in which the imaging preparation switch SW2 is pressed by the operator, and the imaging instruction is given to the processing circuit 41, the transition pulse fluoroscopy is terminated and imaging is performed. Be started.

  FIG. 4 shows a handy type input device 45B which is an example of the input device 45 shown in FIG. The input device 45B includes a shooting preparation switch SW2, a shooting switch SW3, and a gripper H. The input device 45B has a multi-stage switch structure in which the photographing switch SW3 cannot be turned on until the photographing preparation switch SW2 is pressed (ON). In FIG. 4, it is assumed that another device has the function of the perspective switch SW1 shown in FIG.

  When the imaging preparation switch SW2 of the input device 45B is pressed during simple pulse fluoroscopy and an imaging preparation instruction is given to the processing circuit 41, simple pulse fluoroscopy is terminated and transition pulse fluoroscopy is started. When the imaging switch SW3 of the input device 45B is pressed during the transition pulse fluoroscopy in which the imaging preparation switch SW2 is being pressed by the operator, and the imaging instruction is given to the processing circuit 41, the transition pulse fluoroscopy is terminated and imaging is performed. Be started.

  5-7 is a figure for demonstrating the test | inspection sequence determined by the switch in the X-ray diagnostic apparatus 1. FIG.

  FIG. 5 is a diagram showing an inspection sequence in the prior art.

  As shown in FIG. 5, in the conventional technique, the imaging preparation switch is turned on by the operator at a timing when the pulse fluoroscopy is desired to be finished. This is because, in the prior art, the ON of the imaging preparation switch means the end of pulse fluoroscopy. As described above, according to the conventional technique, the time required TC is required for the preparation for photographing to obtain the tube current for photographing from the timing when the photographing preparation switch is turned on. That is, since the tube current necessary for photographing cannot be obtained at the time TC for photographing preparation from the turning on of the photographing preparation switch to the timing t ′ at which photographing is possible, the photographing preparation switch cannot be turned on.

  FIG. 6 is a diagram showing a first examination sequence in the X-ray diagnostic apparatus 1. FIG. 7 is a diagram showing a second inspection sequence in the X-ray diagnostic apparatus 1.

  As shown in FIG. 6, in this embodiment, the imaging preparation switch may be turned on at a timing before the timing at which the operator wants to end the pulse fluoroscopy. This is because in this embodiment, the ON of the imaging preparation switch means switching from simple pulse fluoroscopy to transition pulse fluoroscopy while pulse fluoroscopy is continued. As described above, in this embodiment, the transition pulse fluoroscopy for the required time TD (for example, TD = TC) started at the rough photographing start timing by turning on the photographing preparation switch is continued and the photographing is possible after the timing t. It is possible to wait for severe shooting start timing by the shooting switch. Therefore, the imaging preparation switch can be turned on at any timing without waiting time after the end of the pulse fluoroscopy, and imaging can be executed from that timing.

  Here, a method for setting the fluoroscopy conditions relating to the transition pulse fluoroscopy will be described by taking as an example a case of performing an esophageal examination using the digestive system X-ray diagnostic apparatus 1. The brightness adjustment function based on the fluoroscopic image generated by the simple pulse fluoroscopy stabilizes the luminance of the fluoroscopic image, that is, the fluoroscopy condition relating to the simple pulse fluoroscopy within a certain range is a tube voltage of 80 kV and a tube current of 32. [MA] and irradiation time 4 [ms]. Based on this fluoroscopic condition, the imaging condition calculated by the imaging condition setting function for calculating the imaging condition from the fluoroscopic condition is set to a tube voltage 85 [kV], a tube current 200 [mA], and an irradiation time 100 [ms]. The imaging condition setting function is a method for calculating imaging conditions using different parameters according to an examination technique such as an esophageal examination.

  In the transition pulse fluoroscopy, when the tube current 32 [mA] related to simple pulse fluoroscopy is increased to the target tube current 200 [mA] at the time of imaging, the tube current is 200 [mA] / 32 [mA] = 6. .25 times. Accordingly, the pulse width of each pulse in the transition pulse fluoroscopy is shortened to make a plurality of pulses equivalent doses (mAs values). That is, when the number of pulses within the transition pulse fluoroscopy time TD is n (n = 1, 2,...), The nth pulse (final pulse) is 4 [ms] /6.25=0. The irradiation time is determined so as to be inversely proportional to the increase in tube current so as to be .64 [ms].

  When the number of pulses in the required time TD for transition pulse fluoroscopy is n, n is subtracted from the difference between the tube current associated with simple pulse fluoroscopy and the tube current associated with imaging, so that The tube current to be stacked on is required. In FIG. 6, n = 4, the tube current related to simple pulse fluoroscopy is 32 [mA], and the tube current related to imaging is 200 [mA], so that 42 [mA] is stacked as the tube current. Desired. That is, the tube current indicated by the first pulse related to the transition pulse fluoroscopy is 32 + 42 = 74 [mA], the tube current indicated by the second pulse is 74 + 42 = 116 [mA], and the tube indicated by the third pulse is shown. The current is 116 + 42 = 158 [mA], and the tube current indicated by the fourth pulse is 158 + 42 = 200 [mA].

  By the calculation method as described above, the tube current indicated by the n pulses in the transition pulse fluoroscopy can be gradually and gradually increased from the tube current for simple pulse fluoroscopy to the tube current for imaging. Note that the tube current indicated by the n pulses in the transition pulse fluoroscopy is not limited to a case where the tube current is gradually increased. For example, the tube current indicated by n pulses in the transition pulse fluoroscopy may be increased stepwise, for example.

  On the other hand, in order to set the n pulses of the transition pulse fluoroscopy to the same mAs value (128), the irradiation time (pulse width) of the first pulse related to the transition pulse fluoroscopy is 128/74 = 1.73. The irradiation time of the second pulse is 128/116 = 1.10, the irradiation time of the third pulse is 128/158 = 0.81, and the irradiation time of the fourth pulse is 128/200 = 0.64. That is, the irradiation time indicated by the four pulses in the transition pulse fluoroscopy is gradually reduced.

  As described above, the theoretical mAs value in the transition pulse fluoroscopy is calculated prior to the transition pulse fluoroscopy, assuming that the luminance of the fluoroscopic image is constant if the mAs value is constant. However, it is preferable that the irradiation time is finely adjusted from the calculated value so that the brightness of the plurality of fluoroscopic images related to the transition pulse fluoroscopy becomes substantially constant by the brightness adjustment function during the transition pulse fluoroscopy. Note that the tube voltage in transition pulse fluoroscopy must be applied for each pulse.

  The second inspection sequence shown in FIG. 7 shows a modification of the first inspection sequence shown in FIG. FIG. 6 shows an inspection sequence when imaging is executed from the timing when the imaging preparation switch is turned on. On the other hand, FIG. 7 shows an inspection sequence in a case where imaging is performed after timing of turning on the imaging preparation switch and from timing that matches the pulse period of pulse fluoroscopy.

  Returning to the description of FIGS. 1 and 2, the display 46 is a display device such as a liquid crystal display panel, a plasma display panel, and an organic EL (Electro Luminescence) panel.

  The processing circuit 41 of the image processing apparatus 12 executes a program, thereby performing a pulse fluoroscopy execution unit (for example, a pulse fluoroscopy execution function) 41a, an imaging preparation unit (for example, an imaging preparation function) 41b, and an imaging execution unit (for example, It functions as a photographing execution function) 41c. Note that all or part of the functions 41a to 41c may be provided in the image processing apparatus 12 as hardware.

  The pulse fluoroscopy execution function 41a executes simple pulse fluoroscopy according to fluoroscopy conditions in simple pulse fluoroscopy based on a fluoroscopic instruction from an input circuit 45 that accepts an operation for performing simple pulse fluoroscopy, for example, fluoroscopy switch SW1 illustrated in FIG. Including the function to perform.

  The pulse fluoroscopic execution function 41a includes a function of setting a fluoroscopic condition of the fluoroscopic image in the next frame by a luminance adjustment function based on the fluoroscopic image generated by simple pulse fluoroscopy. In this way, a stable fluoroscopic image can be generated even by pulse fluoroscopy.

  The imaging preparation function 41b is configured to input imaging conditions based on an imaging preparation instruction from an input circuit 45 that accepts an operation for performing imaging preparation, that is, a transition pulse fluoroscopy, for example, the imaging preparation switch SW2 shown in FIGS. Includes a function to set optimal shooting conditions by setting function. In addition, the imaging preparation function 41b has a function of setting the tube current and irradiation time (pulse wave shape) in the transition pulse fluoroscopy so that the luminance of the fluoroscopic image obtained by the transition pulse fluoroscopy is substantially constant, and the set tube current and irradiation. This is a function of performing transition pulse fluoroscopy according to time.

  The shooting execution function 41c performs shooting according to the shooting conditions set by the shooting preparation function 41b based on a shooting instruction from an input circuit 45 that accepts an operation for shooting, for example, a shooting switch SW3 illustrated in FIGS. It is a function to execute.

  Details of the functions 41a to 41c will be described later with reference to FIGS.

  8 and 9 are diagrams showing the operation of the X-ray diagnostic apparatus 1 as a flowchart.

  First, it demonstrates using FIG.1 and FIG.8. After the patient P is placed on the top plate 24, devices such as the body frame 11 constituting the holding device 11 are aligned. The pulse fluoroscopic execution function 41a sets a fluoroscopic condition such as a tube current related to simple pulse fluoroscopy (step ST1). When receiving a fluoroscopic instruction, that is, an operation of the input circuit 45 (for example, turning on the fluoroscopic switch SW1 shown in FIG. 3) (step ST2), the pulse fluoroscopic execution function 41a causes the high voltage supply device 31 to be connected via the control circuit 30. Control is performed to start simple pulse fluoroscopy in accordance with the fluoroscopy conditions set in step ST1 (step ST3).

  The pulse fluoroscopic execution function 41a generates a fluoroscopic image by simple pulse fluoroscopy started in step ST3, and displays the fluoroscopic image on the display 46 (step ST4). The pulse fluoroscopic execution function 41a resets the fluoroscopic condition in the next frame by the brightness adjustment function based on the fluoroscopic image generated in step ST4 (step ST5).

  The pulse fluoroscopic execution function 41a determines whether or not an imaging preparation instruction, that is, an operation of the input circuit 45 (for example, ON of the imaging preparation switch SW2 shown in FIG. 3) has been received (step ST6). If NO in step ST6, that is, if it is determined that the imaging preparation switch SW2 is not ON, the pulse fluoroscopic execution function 41a continues the simple pulse fluoroscopy started in step ST3 (step ST4). Thus, by repeating steps ST4 to ST6, a plurality of fluoroscopic images can be displayed as moving images on the display 46 (step ST4).

  On the other hand, if YES in step ST6, that is, if it is determined that the photographing preparation switch SW2 has been turned on, the photographing preparation function 41b controls the high voltage supply device 31 via the control circuit 30 to perform simple processing. The pulse fluoroscopy is terminated (step ST7), and imaging conditions are set (step ST8). The shooting preparation function 41b sets an optimal shooting condition by a shooting condition setting function.

  Further, the imaging preparation function 41b calculates a fluoroscopic condition related to the transition pulse fluoroscopy so that the tube current increases to the tube current in imaging based on the imaging condition set in step ST8 (step ST9). For example, the imaging preparation function 41b calculates the four tube currents indicated by the four pulses of the transition pulse fluoroscopy shown in FIG. 6 so that the values gradually increase, and the four pulses indicated by the four pulses. The irradiation time is calculated so that the mAs value is constant. The imaging preparation function 41b starts the transition pulse fluoroscopy according to the fluoroscopy conditions set in step ST9 (step ST10).

  Moving to the description of FIGS. 1 and 9, the imaging preparation function 41b generates a fluoroscopic image by the transition pulse fluoroscopy started in step ST10, and displays the fluoroscopic image on the display 46 (step ST11). Note that the imaging preparation function 41b preferably performs fine adjustment from the calculated value of the irradiation time in transition pulse fluoroscopy so that the luminance of the fluoroscopic image becomes substantially constant by the luminance adjustment function.

  The imaging preparation function 41b determines whether or not the tube current has reached a target (a tube current value in subsequent imaging) (step ST12). If NO in step ST12, that is, if it is determined that the tube current has not reached the target, the imaging preparation function 41b continues the transition pulse fluoroscopy started in step ST10 (step ST11). The case where it is determined that the tube current has not reached the target means that it is time for transition pulse fluoroscopy. Thus, by repeating steps ST11 to ST12, a plurality of fluoroscopic images can be displayed as moving images on the display 46 (step ST11).

  On the other hand, if the determination in step ST12 is YES, that is, if it is determined that the tube current has reached the target, the imaging preparation function 41b indicates that preparation for imaging has been completed at the timing t shown in FIGS. Notification is performed (step ST13), and the process waits until there is a shooting instruction. The case where it is determined that the tube current has reached the target means that the tube current in transition pulse fluoroscopy has reached the target tube current for imaging.

  When the imaging execution function 41c receives an imaging instruction, that is, an operation of the input circuit 45 (for example, ON of the imaging preparation switch SW3 shown in FIG. 3) (step ST14), the imaging execution function 41c controls the high voltage supply device 31 via the control circuit 30. Then, the transition pulse fluoroscopy is terminated (step ST15), and imaging is performed according to the imaging conditions set in step ST8 (step ST16).

  The photographing execution function 41c generates a photographed image by photographing performed in step ST16 and displays the photographed image on the display 46 (step ST17). The imaging execution function 41c determines whether or not to end the inspection (step ST18). If NO in step ST18, that is, if it is determined not to end the inspection, the pulse fluoroscopy execution function 41a controls the high voltage supply device 31 via the control circuit 30 to start simple pulse fluoroscopy ( Step ST3).

  On the other hand, if YES in step ST18, that is, if it is determined that the inspection is to be ended, the processing circuit 41 ends the operation.

  According to the X-ray diagnostic apparatus 1, by providing the imaging preparation switch SW2 (shown in FIGS. 3 and 4) for switching simple pulse fluoroscopy to transition pulse fluoroscopy, imaging can be performed in a short time following pulse fluoroscopy. Thus, the operability of inspection can be improved.

(Modification)
6 and 7 show an example in which the photographing switch is turned on after the photographing possible timing t, but the present invention is not limited to this case. The shooting switch may be turned on before the shooting possible timing t.

  FIG. 10 is a diagram showing a third examination sequence in the X-ray diagnostic apparatus 1.

  FIG. 10 shows an inspection sequence when the imaging switch is turned ON during the transition pulse fluoroscopy. At the timing when the imaging switch is turned on, the tube current for transition pulse fluoroscopy only increases up to 116 [mA], so that the imaging tube current is 116 [mA]. On the other hand, a necessary irradiation time is controlled by automatic exposure control (AEC) so that the mAs value equivalent to the captured image generated by the imaging of FIGS. 6 and 7 is obtained.

  According to a modification of the X-ray diagnostic apparatus 1, imaging preparation switch SW2 (shown in FIGS. 3 and 4) for switching simple pulse fluoroscopy to transition pulse fluoroscopy can be provided to perform radiographing in a short time following pulse fluoroscopy. By doing so, the operability of the inspection can be improved. Further, according to the modified example of the X-ray diagnostic apparatus 1, it is possible to generate a captured image having a constant luminance even at a timing when a target tube current cannot be obtained by an early imaging instruction from the operator. it can.

  According to the X-ray diagnostic apparatus according to at least one embodiment described above, the operability of examination can be improved by enabling imaging to be performed in a short time following pulse fluoroscopy.

  Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... X-ray diagnostic apparatus 11 ... Holding apparatus 12 ... Image processing apparatus 27 ... X-ray irradiation apparatus 28 ... X-ray detection apparatus 31 ... High voltage supply apparatus 41 ... Processing circuit 41a ... Pulse fluoroscopy execution function 41b ... Imaging preparation function 41c ... Shooting execution function 45 ... input circuit 46 ... display SW1 ... fluoroscopic switch SW2 ... shooting preparation switch SW3 ... shooting switch

Claims (6)

An X-ray tube that emits X-rays;
An X-ray detector for detecting the X-ray;
Voltage supply means for supplying a voltage to the X-ray tube and controlling to irradiate the X-ray from the X-ray tube;
First input means for accepting an operation for performing fluoroscopy with the X-ray;
A second input means for accepting an operation for transitioning the X-ray condition relating to the fluoroscopy to the X-ray condition relating to imaging by the X-ray;
Third input means for accepting an operation for performing the photographing;
X-ray diagnostic apparatus. The fluoroscopy is a pulse fluoroscopy in which the X-ray pulse is repeatedly and repeatedly irradiated.
When the operation is accepted from the second input means, the tube current and the X-ray pulse irradiation as the X-ray condition related to the pulse fluoroscopy so that the brightness of the fluoroscopic image obtained by the pulse fluoroscopy is substantially constant. It further has photographing preparation means for controlling time,
The X-ray diagnostic apparatus according to claim 1. When receiving the operation from the second input means, the imaging preparation means controls the voltage supply means to increase the tube current so that the brightness of the fluoroscopic image is substantially constant, and Controlling the voltage supply means to reduce the irradiation time;
The X-ray diagnostic apparatus according to claim 2. When the imaging preparation unit receives the operation from the second input unit, the imaging preparation unit controls the voltage supply unit such that the irradiation time of the pulse is constant.
The X-ray diagnostic apparatus according to claim 3. An input device is provided that configures the second input means and the third input means as a multistage switch.
The X-ray diagnostic apparatus as described in any one of Claims 1 thru | or 4. An input device is provided that configures the first input means, the second input means, and the third input means as a multistage switch,
The input device comprises a configuration for accepting the transition operation when the second input unit is pressed while the first input unit is pressed.
The X-ray diagnostic apparatus as described in any one of Claims 1 thru | or 4.

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