JP2005027359A - X-ray diagnostic system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray diagnostic system capable of eliminating the factor of increase in the fatigue of an observer due to a duplex image in any one of either a region of a concerned portion or a region other than the concerned portion. <P>SOLUTION: The X-ray diagnostic system comprises: X-ray exposure vessels 1, 2 for irradiating an examinee body with X-rays; an image intensifier 5 or a television camera 6 for picking up an X-ray image translucent through the examinee body; a monitor 26 for displaying the X-ray image; a mouse 20 for setting a high-contrast region in the displayed X-ray image; an image processing part 18 for applying image processing to the X-ray image so that the contrast in a portion corresponding to a region other than a high-contrast region can become lower than the contrast in a portion corresponding to the high-contrast region on the basis of setting; and a monitor driving part 25 for displaying the X-ray image to which image processing is applied by the image processing part 18, on the monitor 26. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an X-ray diagnostic apparatus that displays an X-ray fluoroscopic image in real time such as surgery support.

  When an operator (surgeon in charge) performs an operation in an orthopedic surgery, an imaging device (fluoroscopic device) such as an X-ray is used to image the surgical site of the subject, and the captured image is displayed on a display or the like. An X-ray diagnostic apparatus is known that supports the surgeon's surgery by displaying it on the display screen.

  Furthermore, a technique called stereo fluoroscopy is known. For example, there are two focal points, and X-rays are alternately exposed from one of the two focal points to the observation site of one subject, and an image obtained when X-rays are emitted from one focal point is displayed on the right eye. By observing with X and observing with the left eye the image obtained when X-rays are exposed from the other focal point, the X-rays at the observation site can be observed in three dimensions. Observation of such a three-dimensional image (stereo image) is used to grasp the travel of a blood vessel having a complicated three-dimensional structure, particularly in the diagnosis of the circulatory system. A stereo fluoroscopic image display device employing such a stereo fluoroscopic technique is known.

  Specifically, FIG. 9 shows an example of a schematic configuration of a conventional stereo fluoroscopic system using X-rays. Two X-ray tubes 101 and 102 are arranged at a predetermined distance corresponding to the right-eye image and the left-eye image, and the X-ray exposure side of these X-ray tubes 10 and 102 is the subject. A collimator 104 for appropriately adjusting the X-ray dose exposed to the observation site 103 is arranged. The subject 103 is located between the collimator 104 and the image intensifier 105.

  The X-ray tubes 101 and 102 alternately emit X-rays at high speeds at a constant time interval by switching based on a timing signal from a timing signal generator of a control processing unit described later. This X-ray is exposed to the subject 103 via the collimator 104. X-rays transmitted through the subject 103, that is, transmitted X-ray images, enter the image intensifier 105 and are converted into light to become visible images. The visible image is photographed by the television camera 106, and an imaging signal obtained by photographing is output from the television camera 106. The television camera 106 generally uses an imaging tube or a CCD (charge coupled device) as an imaging device.

  FIG. 10 is a block diagram illustrating a configuration of a control processing unit that processes an imaging signal. The control unit 111 is a CPU (central processing unit) 111-1, which constitutes the control unit main body, a read only memory (ROM) 111-2 in which program data is stored, and a RAM (random) in which various memory areas are formed. accessmemory) 111-3 and the like.

  The control unit 111 is connected to a timing signal generation unit 113, an A / D (analog / digital) converter 114, an image processing unit 115, and the like via a system bus 112. The timing signal generator 113 generates a timing signal for controlling the switching timing between the right image and the left image, and the generated timing signal drives and controls the X-ray tubes 101 and 102, respectively. The X-ray tube drive control unit (not shown), the TV camera 106, the A / D converter 114, and the image processing unit 115 are supplied to each unit described later.

  The A / D converter 114 receives the imaging signal output from the television camera 106 and converts it into digital data (digital signal). Digital data obtained by this conversion is output to the image processing unit 115. The image processing unit 115 cuts out noise and unnecessary signal components to extract only necessary signal components, and performs filter processing for edge enhancement (contour enhancement) as a spatial filter, gradation for determining density, etc. Perform gradation processing for adjustment, affine transformation, and the like. Note that the conventional stereo fluoroscopic system using X-rays has a LIH (Last Image Hold) function that holds the image of the previous X-ray exposure on the monitor even if X-ray exposure is not performed. The image processing unit 115 performs edge enhancement processing, gradation processing, and the like with reference to the hold image by LIH.

  The digital data processed in this way is stored in the right image memory 116 or the left image memory 117 one screen at a time as right perspective image data or left perspective image data based on the timing signal from the timing signal generator 113. It is stored in either one.

  The right image memory 116 and the left image memory 117 each have a storage area (format) so as to store a plurality of pieces of fluoroscopic image data. The image selector 118 receives a timing signal from the timing signal generator 113. Based on the signal, the fluoroscopic image data is alternately read sequentially from the right image memory 116 and the left image memory 117, and the read fluoroscopic image data is supplied to the monitor driving unit 119. The monitor driving unit 119 displays a fluoroscopic image on the monitor 120 based on the supplied fluoroscopic image data. For example, if the monitor 120 is a CRT (cathode ray tube) display, the monitor drive unit 119 includes a D / A converter, converts the fluoroscopic image data, which is digital data, into an analog signal for monitoring, and sends it to the monitor 120. Supply and display. Further, the monitor driving unit 119 is configured to shield (close the shutter) either the right eye or the left eye of the shutter glasses 121 in synchronization with the switching timing of the image memories 116 and 117 by the image selector 118. That is, when the monitor drive unit 119 displays the image data read from the right image memory 116 on the monitor 120, the monitor drive unit 119 blocks the left eye of the shutter glasses 121 and displays the image data read from the left image memory 117 on the monitor 120. In some cases, the right eye of the shutter glasses 121 is shielded.

  This is a stereo display device using one monitor and shutter glasses, but it can be used in the same manner in a stereo display device using a stereo viewer in which the polarization is orthogonal to the two monitors and the right and left eyes. it can. In this case, the image data read from the right image memory 116 by the image selector 118 is displayed on the right image monitor arranged on the viewer's right eye side while being polarized in parallel with the polarization of the right eye of the stereo viewer. Then, the image data read from the left image memory 117 by the image selector 118 is displayed on the left image monitor arranged on the viewer's left eye side while being polarized in parallel with the polarization of the left eye of the stereo viewer. With the above configuration, the observer (operator) observes the right image with the right eye and the left image with the left eye, and observes the observation site (surgical site) with a stereoscopic stereo image. Can do.

  In a stereo image, it is necessary to adjust the focus of the image. If this focus position is set as a surgical site (target site) in the observation site of the subject, a site that is shifted in the depth direction from this focus location (especially of interest) There is a problem that the image of another part different from the part) looks double. That is, when the position where the X-ray tube is arranged is in the upward direction and the image intensifier is in the downward direction, FIG. 11A is a top view showing the arrangement positions of the observation region of the subject and the surrounding portions. 11 (b) is a front view thereof, and FIG. 11 (c) is a side view thereof. At this time, when the image is focused on the surgical site 1 indicated by hatching, the other sites 2, 3 and 4 are not focused and appear double. The surgeon's eyes are looking at the observed part, but there is a problem that other parts 2, 3, and 4 that appear double in the field of view are one of the factors that increase the operator's fatigue. .

  An object of the present invention is to provide an X-ray diagnostic apparatus capable of removing one factor of an increase in observer fatigue due to a double image in either a region of a region of interest or a region other than a region of interest.

In the first aspect of the present invention, an X-ray diagnostic apparatus includes an X-ray exposure unit that exposes an X-ray toward a subject, an imaging unit that captures an X-ray image transmitted through the subject, and an X-ray. Display means for displaying an image, setting means for setting a high-contrast region in the X-ray image to be displayed, and the contrast of a portion corresponding to a region other than the high-contrast region based on the setting by the setting unit Image processing means for performing image processing on the X-ray image captured by the imaging means so as to be lower than the contrast of the portion corresponding to the contrast area, and the X-ray image subjected to image processing by the image processing means for the display Display control means for displaying by the means.
In the second aspect of the present invention, an X-ray diagnostic apparatus includes an X-ray exposure unit that emits X-rays toward a subject, an imaging unit that captures an X-ray image transmitted through the subject, and the imaging A display means for displaying an X-ray image captured by the means, a setting means for setting a high contrast region in the X-ray image to be displayed, and provided between the X-ray exposure means and the imaging means, Based on the setting of the semi-transmissive filter for reducing the amount of X-ray transmission and the setting means, the X-ray transmitted through the semi-transmissive filter is exposed to a portion corresponding to a region other than the high contrast region. And semi-transmission filter moving means for moving the semi-transmission filter.

  As described in detail above, according to the present invention, there is provided an X-ray diagnostic apparatus capable of removing one factor of an increase in observer fatigue due to a double image in either a region of a region of interest or a region other than a region of interest. Can be provided.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of an X-ray stereo fluoroscopic system to which the present invention is applied. This is a stereo X-ray tube composed of two X-ray tubes 1 and 2 corresponding to the right image and the left image. The X-ray tubes 1 and 2 are arranged so as to be separated from each other by a predetermined distance, and the X-ray emission direction (radiation angle) is controlled to coincide with the set focal point. On the X-ray exposure side of these X-ray tubes 1 and 2, a collimator 4 for appropriately adjusting the X-ray dose exposed to the observation site of the subject 3 is disposed. The subject 3 is located between the collimator 4 and the image intensifier 5.

  The X-ray tubes 1 and 2 emit X-rays alternately at a constant time interval by switching based on a timing signal from a timing signal generator of a control processing unit, which will be described later. This X-ray is exposed to the subject 3 through the collimator 4.

  X-rays transmitted through the subject 3, that is, transmitted X-ray images, are incident on the X-ray incident surface (surface) of the image intensifier 5 and converted into light to become a visible image. This visible image is photographed by the television camera 6 arranged on the light emitting surface (back surface) side of the image intensifier 5. The television camera 6 is composed of an image pickup device such as an image pickup tube or a CCD (charge coupled device), and outputs a signal output from each image pickup device by the image pickup as an image pickup signal.

  FIG. 2 is a block diagram illustrating a configuration of a control processing unit that processes an imaging signal. The control unit 11 includes, as a CPU board, a central processing unit (CPU) 12 constituting a main body of the control unit, a read only memory (ROM) 13 in which program data is stored, and a random access memory (RAM) in which various memory areas are formed. 14 etc. The control unit 11 includes a timing signal generation unit 16, an A / D (analog / digital) converter 17, an image processing unit 18, a region of interest setting unit 19, and a mouse for designating a region of interest via the system bus 15. 20 is connected to a mouse interface 21 that controls transmission of data to and from other peripheral devices (not shown).

  The timing signal generator 16 generates a timing signal for controlling the switching timing between the right image and the left image, and the generated timing signal drives and controls each of the X-ray tubes 1 and 2. The X-ray tube drive control unit (not shown), the TV camera 6, the A / D converter 17, and the image processing unit 18 are supplied to each unit described later. The A / D converter 17 inputs the image pickup signal output from the television camera 6 and converts it into digital data (digital signal). The digital data obtained by this conversion is output to the image processing unit 18.

  As shown in FIG. 3, the image processing unit 18 includes a filter processing unit 31, a gradation processing unit 32, an AFIN conversion unit 33, a moving body region extraction unit 34, a region of interest expansion unit 35, a monaural processing unit 36, a contrast reduction unit A processing unit 37 and the like are provided. The filter processing unit 31 cuts out noise and unnecessary signal components of the digital data (digital signal) from the A / D converter 17 and extracts only necessary signal components, and also performs edge enhancement as a spatial filter ( (Contour emphasis). The gradation processing unit 32 adjusts the gradation (contrast) that determines the density and the like of the digital data processed by the filter processing unit 31. The AFIN conversion unit 33 performs affine conversion on the digital data whose gradation is adjusted by the gradation processing unit 32. The digital data processed as described above is collected as right perspective image data or left perspective image data based on the timing signal from the timing signal generator 16.

  The moving object region extraction unit 34 detects a moving object such as a treatment tool from the collected right perspective image data and left perspective image data, and extracts the moving object region. As a moving object detection method, the right perspective image data and the left perspective image data of the previous frame stored in the right image memory 22 or the left image memory 23, the right perspective image data and the left perspective image of the current frame are used. The moving object is determined by comparing the data and analyzing the change in the data of each pixel. Note that it is not necessary to analyze both the right image memory 22 and the left image memory 23, and the fluoroscopic image data of the previous frame and the current frame may be compared for only one of them.

  The attention area expanding unit 35 extracts the moving object region extracted by the moving object region extracting unit 34 into the attention region set by the attention region setting unit 19 with respect to the collected right perspective image data and left perspective image data. Add Alternatively, the attention area is expanded to include the moving object area. The monaural processing unit 36 applies the right-side perspective image data and the left-side perspective image data to the right side for regions other than the attention region set by the attention region setting unit 19 or the attention region extension unit 35. Control is performed so that only one of the collected right perspective image data and left perspective image data is written in both the image memory 22 and the left image memory 23.

  The contrast reduction processing unit 37 applies a floor to an area other than the attention area set by the attention area setting section 19 or the attention area expansion section 35 with respect to the collected right perspective image data and left perspective image data. Control is performed such that the tone (contrast) is reduced to a preset numerical value and written to the right image memory 22 and the left image memory 23. When the attention area is designated and input by the mouse 20, the attention area setting section 19 is based on the input data, and attention is paid to the right perspective image data and the left perspective image data collected by the image processing section 18. Set the area.

  As described above, the image processing unit 18 uses the digital data from the A / D converter 17 based on the timing signal from the timing signal generation unit 16 as the right perspective image data or the left perspective image data. The right perspective image data is written into the right image memory 22 and the left perspective image data is written into the left image memory 23. The right image memory 22 and the left image memory 23 each have a storage area so that perspective image data for a plurality of screens can be stored.

  The image selector 24 alternately reads the perspective image data from the right image memory 22 and the left image memory 23 on the basis of the timing signal from the timing signal generator 16, and monitors the read perspective image data. To the unit 25. The monitor driving unit 25 displays a fluoroscopic image on the monitor 26 based on the supplied fluoroscopic image data. For example, if the monitor 26 is a CRT (cathode ray tube) display, the monitor drive unit 25 includes a D / A converter, converts the fluoroscopic image data, which is digital data, into an analog signal for monitoring, and sends it to the monitor 26. Supply and display. Further, the monitor driving unit 25 is configured to shield (close the shutter) either the right eye or the left eye of the shutter glasses 27 in synchronization with the switching timing of the image memories 22 and 23 by the image selector 24. Yes. That is, when the fluoroscopic image data read from the right image memory 22 is displayed on the monitor 26, the monitor driving unit 25 blocks the left eye of the shutter glasses 27 and reads the fluoroscopic image read from the left image memory 23. When data is displayed on the monitor 26, the right eye of the shutter glasses 27 is shielded.

  The mouse 20 moves the cursor displayed on the monitor 26 and designates and inputs a position or area on the monitor 26. In the first embodiment having such a configuration, four modes of a moving object mode, a monaural mode, a contrast mode, and an inversion mode are prepared. The moving body mode includes an OFF mode in which the moving body is ignored, an ON mode in which the moving body area is added to the attention area, and an expansion mode in which the attention area is expanded to include the moving body mode.

  As for the monaural mode, an OFF mode in which nothing is performed and an ON mode in which a region other than the attention region is a non-stereo (non-stereo) image of only one of the right image and the left image are provided. Contrast modes are provided with an OFF mode in which nothing is performed and an ON mode in which the contrast of a region other than the region of interest is reduced. The inversion mode includes an OFF mode in which nothing is performed and an ON mode in which the display state is inverted between the attention area and an area other than the attention area.

  For example, as shown in FIG. 4, when the attention area B is designated and input as indicated by a broken line with the mouse around the attention area A, the attention area setting unit 19 sets the attention area B. At this time, when the monaural mode is set to the ON mode, only the right image or the left image is displayed in the region F other than the attention region B, that is, the region including the non-attention portions C, D, and E, and is made non-stereo. The non-attention sites C, D, and E are displayed as planar images that are not doubled. Further, when the contrast mode is set to the ON mode, the contrast of the region F is lowered, and the non-target regions C, D, and E are displayed as blurred (light) images with low contrast. Of course, when both the monaural mode and the contrast mode are set to the ON mode, the non-attention sites C, D, and E are displayed as planar images that are not doubled and are blurred (light) with low contrast. . Note that, in any of the above cases, the attention area B, that is, the attention area A is displayed as a three-dimensional stereo image with high contrast (clear).

  Further, when the moving body mode is set to the ON mode, a moving body (treatment tool, for example, a drill or the like) G is detected by the moving body region extracting unit 34, and the moving body region H is set. This moving object region H, that is, the moving object G, is displayed as a stereoscopic image having a high contrast (clear) like the attention site A of the attention region B, regardless of how the monaural mode and the contrast mode are set. Is done. When the moving object mode is set to the expansion mode, the moving object G is detected by the moving object region extraction unit 34, and the moving object region H is set. Further, the region of interest A is expanded so as to include this moving body region H, and an expanded region J is set. This extended area J (area including the attention area B and the moving object area H) is displayed as a high-contrast (clear) three-dimensional stereo image, no matter how the monaural mode and contrast mode are set. .

  When the inversion mode is set to the ON mode, the display state described above is inverted between the attention area B and the other areas. That is, only the attention area B is made non-stereo and is displayed as a flat image that is not doubled, or a contrast is reduced and a blurred (thin) image, and the other areas have high contrast (clear). Displayed as a stereoscopic stereo image.

  As described above, according to the first embodiment, if the mouse 20 surrounds and inputs the region of interest A, it can be set as the region of interest B. The region other than the region of interest B or this region of interest can be set. Only B can be made non-stereo or the contrast can be reduced, and a factor of increased observer fatigue due to the double image can be eliminated. In addition, according to the first embodiment, the moving object G is automatically detected and the moving object region H is set, and the moving object region H is not de-stereoized and the contrast is not reduced. Even if it is not set as a region of interest, it can be observed as a clear and stereoscopic stereo image with high contrast.

  A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a semi-transmission filter 7 for reducing the X-ray dose as shown in FIG. 5 can be inserted between the collimator 4 and the subject 3 in the first embodiment. It was installed in. Accordingly, since the other components are the same, the same members are denoted by the same reference numerals, and the description thereof is omitted.

  The semi-transmissive filter 7 has an appropriate shape (circular shape, quadrangular shape, etc.) and width (a size in which the observed portion and its vicinity can be sufficiently accommodated) according to the type of the portion to be observed (size of the portion). An opening 7-1 is formed. As shown in FIG. 6, when the center of the attention site is designated and input on the monitor 26 by the mouse 20, the attention region is set by the attention region setting unit 19, and based on the set attention region, the attention region is set. The transflective filter movement control unit 28 connected to the CPU 12 via the system bus 15 inserts the transflective filter 7 between the collimator 4 and the subject 3, and opens the aperture 7-1 in the region of interest. The movement is controlled so that it is located above.

  In the second embodiment having such a configuration, when a region of interest (center point) is designated and input on the monitor 26 by the mouse 20, the semi-transmissive filter 7 is inserted between the collimator 4 and the subject 3. The opening 7-1 is positioned on the attention area. Therefore, in the region other than the region of interest centered on the region of interest, the semi-transmission filter 7 is applied, the X-ray dose exposed to the subject 3 is reduced, and the same effect as when the contrast is reduced is obtained. Displayed as a (light) image. On the other hand, the region of interest where the opening 7-1 is located is exposed to a normal X-ray dose, and is displayed as a clear and stereoscopic stereo image without a decrease in contrast.

  As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and further, the X-ray exposure dose to the region other than the region of interest can be reduced by the semi-transmissive filter. 7, the unnecessary X-ray exposure amount in the region other than the region of interest can be reduced, and the burden on the subject can be reduced.

  A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, as shown in FIG. 7, an X-ray exposure range is limited between the collimator 4 and the subject 3 in the first embodiment. The line diaphragm 8 is installed so that it can be inserted. Accordingly, since the other components are the same, the same members are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 8, when a region of interest surrounding the region of interest is designated and input on the monitor 26 by the mouse 20, the region of interest is set by the region of interest setting unit 19. Based on the position and width, the X-ray diaphragm 8 is inserted between the collimator 4 and the subject 3 by the X-ray diaphragm drive control unit 29 connected to the CPU 12 via the system bus 15. The aperture of the X-ray aperture 8 is controlled. That is, the exposure range of the X-rays narrowed down by the X-ray diaphragm 8 is controlled so that the region of interest falls.

  In the third embodiment having such a configuration, when a region of interest surrounding the region of interest is designated and input on the monitor 26 by the mouse 20, the X-ray diaphragm 8 is inserted between the collimator 4 and the subject 3. Then, the X-ray exposure range focused by the X-ray diaphragm 8 is controlled so that the region of interest falls. Therefore, X-rays are shielded by the X-ray diaphragm 8 in the areas other than the attention area, and only the attention area is exposed to the subject 3 and the other areas are not exposed. As a result, on the monitor 26, only the region of interest is displayed as a clear and three-dimensional stereo image without a decrease in contrast. Since the X-rays are shielded from the area other than the attention area, no image is displayed.

  As described above, according to the third embodiment, the same effects as those of the first embodiment can be obtained, and further, X-ray exposure to an area other than the attention area can be performed by the X-ray aperture 8. This can be prevented by shielding. That is, unnecessary X-ray exposure in a region other than the region of interest at the site of the subject can be prevented, and the burden on the subject can be reduced. The X-ray diaphragm 8 is formed by the semi-transmissive filter described in the second embodiment, and the size of the opening of the semi-transmissive filter is set according to the size of the region of interest set by the mouse 20. It may be made to be adjustable.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The figure which shows the structure of the outline of the X-ray stereoscopy system of 1st Embodiment of this invention. The block diagram which shows the structure of the control processing unit which processes the imaging signal of the X-ray stereoscopy system of the embodiment. The block diagram which shows the principal part structure of the image process part of the control processing unit of the X-ray stereoscopy system of the embodiment. The figure which shows an example of the screen display of the monitor in the X-ray stereo fluoroscopic system of the embodiment. The figure which shows the structure of the outline of the X-ray stereoscopy system of 2nd Embodiment of this invention. The block diagram which shows the structure of the control processing unit which processes the imaging signal of the X-ray stereoscopy system of the embodiment. The figure which shows the structure of the outline of the X-ray stereoscopy system of 3rd Embodiment of this invention. The block diagram which shows the structure of the control processing unit which processes the imaging signal of the X-ray stereoscopy system of the embodiment. The figure which shows an example of the structure of the outline of the stereo fluoroscopy system using the conventional X-ray. The block diagram which shows the structure of the control processing unit which processes the imaging signal of the stereo fluoroscopic system of the prior art example. The top view, front view, and side view which show the arrangement | positioning position of the observation site | part of a subject and each site | part of the periphery of it.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... X-ray tube (stereo X-ray tube), 7 ... Semi-transmission filter, 8 ... X-ray aperture, 11 ... CPU, 18 ... Image processing part, 19 ... Attention area setting part, 20 ... Mouse, 34 ... Moving object region extraction unit, 35... Attention region expansion unit, 36... Monaural processing unit, 37.

Claims (3)

X-ray exposure means for exposing an X-ray toward the subject, imaging means for picking up an X-ray image transmitted through the subject, display means for displaying the X-ray image, and within the X-ray image to be displayed Based on the setting by the setting means for setting the high contrast region and the setting means, the contrast of the portion corresponding to the region other than the high contrast region is lower than the contrast of the portion corresponding to the high contrast region, An image processing unit that performs image processing on the X-ray image captured by the imaging unit, and a display control unit that causes the display unit to display the X-ray image that has been subjected to image processing by the image processing unit. X-ray diagnostic equipment. X-ray exposure means for exposing X-rays toward the subject, imaging means for taking an X-ray image transmitted through the subject, and display means for displaying the X-ray image taken by the imaging means A setting means for setting a high-contrast region in the X-ray image to be displayed; a semi-transmission filter provided between the X-ray exposure means and the imaging means for reducing the amount of X-ray transmission; A semi-transmissive filter moving means for moving the semi-transmissive filter so that X-rays transmitted through the semi-transmissive filter are exposed to a portion corresponding to a region other than the high-contrast region based on the setting by the setting unit; An X-ray diagnostic apparatus comprising: The X-ray diagnostic apparatus according to claim 2, wherein the semi-transmissive filter is provided between the X-ray irradiation means and the subject.

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