JP2015024093A - X-ray imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray imaging device which can keep display consistency between a final frame image (LIH image) when positioning and an image after the positioning while reducing an X-ray exposure dose after the positioning.SOLUTION: The X-ray imaging device includes: an X-ray source which emits X-rays; an X-ray flat surface detector which is disposed to face the X-ray source and detects the X-rays transmitted through a subject; an image generation part which generates the image of the subject on the basis of the transmission X-rays detected by the X-ray flat surface detector; a display part which displays the image generated by the image generation part; and an image control part which stores the final frame image of a fluoroscopic image and displays the image on the display part. The image control part includes an inverse rotation processing part which inverts the stored final frame image (LIH image) in response to the inverse rotation of a relative position of the X-ray flat surface detector and the subject.

Description

  The present invention relates to an X-ray imaging apparatus, and more particularly to an X-ray image display control technique in an X-ray imaging apparatus having a LIH (Last Image Holding) function.

  An X-ray imaging apparatus having a structure in which an X-ray source and an X-ray detector are supported by a C-arm adjusts the position of the C-arm fixed on a pedestal equipped with traveling wheels so as to sandwich the subject. The X-ray detector is positioned and imaging is performed. At this time, the positions of the X-ray source and the X-ray detector are adjusted so that an X-ray transmission image can be obtained by reliably irradiating the target portion of the subject with X-rays. In order to adjust the positions of the X-ray source and the X-ray detector, a support unit such as a C-arm is provided with a mechanism for rotating the C-arm with respect to the support unit or an X-ray detector attached to the C-arm. A mechanism for rotating in a plane parallel to the line incident surface is provided. Usually, positioning is performed by performing fluoroscopic imaging by irradiating X-rays from an X-ray source and operating the above-described mechanism while viewing a fluoroscopic image displayed on a display device.

  In the X-ray imaging apparatus, when the positions of the X-ray source and the X-ray detector with respect to the subject are determined and the X-ray irradiation is stopped, the image of the last frame of the fluoroscopic image (hereinafter referred to as the LIH image). Is displayed as a still image.

  In actual imaging, after positioning in this way, the position of an FPD (Flat Panel Detector) is further finely adjusted, or the C-arm is rotated to obtain an image with better image quality. In many cases, the X-ray detector is inverted. In that case, there is a problem that an image obtained by subsequent imaging or fluoroscopy is an image whose direction is different from that of the LIH image, and the region of interest is difficult to recognize.

  A conventional X-ray imaging apparatus has an image inversion function to display an image in the same direction when the X-ray source and the X-ray detector are turned upside down by rotating the C arm. If this is the case, it must continue to be irradiated with X-rays. A technique for rotating the LIH image corresponding to the rotation of the FPD after positioning is proposed in Patent Document 1, but this technique cannot cope with the inversion of the positions of the X-ray source and the X-ray detector. .

International Publication No. 2012/098949

  It is an object of the present invention to provide an X-ray imaging apparatus capable of maintaining the consistency of display between a final frame image (LIH image) at the time of positioning and a subsequent captured image while reducing the X-ray exposure after positioning. .

  The X-ray imaging apparatus of the present invention has a function of inverting the displayed LIH image as the apparatus positions of the X-ray source and the X-ray detector with respect to the subject are inverted. The inversion function is performed by operating an operation button that instructs inversion. Alternatively, the inversion may be detected on the apparatus side, and the image may be inverted accordingly.

  That is, the X-ray imaging apparatus of the present invention includes an X-ray source that irradiates X-rays, an X-ray flat panel detector that is disposed opposite to the X-ray source and detects X-rays transmitted through a subject, and the X-rays An image generation unit that generates an image of the subject based on transmitted X-rays detected by a flat panel detector, a display unit that displays an image generated by the image generation unit, and a final frame image of a fluoroscopic image, An image control unit to be displayed on the display unit, and the image control unit inverts the stored final frame image (LIH image) corresponding to inversion of a relative position between the X-ray flat panel detector and the subject. And a reversal processing unit to be provided.

  According to the present invention, since the inverted LIH image is displayed corresponding to the inversion on the apparatus side, the actual positions of the X-ray source and the X-ray detector can be matched with the LIH image. Accordingly, since the inversion of the apparatus after positioning can be reflected in the LIH image, it is possible to eliminate unnecessary exposure from the positioning to the apparatus inversion.

Overall schematic diagram of the X-ray diagnostic imaging apparatus of the first embodiment Functional block diagram of the FPD control unit and image processing unit of the X-ray diagnostic imaging apparatus of FIG. FIGS. 5A and 5B are diagrams showing the upside-down inversion of the relative positions of the X-ray tube and the FPD and the subject, and FIGS. The figure explaining in-plane reversal of the relative position of an X-ray tube and FPD and a subject The flowchart which shows an example of operation | movement of the X-ray-image diagnostic apparatus of 1st embodiment. The figure explaining the upside down process of a LIH image The figure explaining the up / down / left / right inversion processing of the LIH image Functional block diagram of an FPD control unit and an image processing unit of the X-ray diagnostic imaging apparatus according to the second embodiment The flowchart which shows an example of operation | movement of the X-ray-image diagnostic apparatus of 2nd embodiment. Diagram showing changes in captured image when rotated / inverted The figure which shows the case where the same change as FIG. 10 is performed by the process with respect to a LIH image The figure which shows the outline of the support apparatus of the X-ray image diagnostic apparatus of 3rd embodiment.

Embodiments of the X-ray imaging apparatus of the present invention will be described below.
The X-ray imaging apparatus of this embodiment includes an X-ray source (12) that irradiates X-rays, and an X-ray flat panel detector (13) that is disposed opposite to the X-ray source and detects X-rays that have passed through a subject. ), An image generation unit (181) that generates an image of the subject based on transmitted X-rays detected by the X-ray flat panel detector, and a display unit (16) that displays an image generated by the image generation unit. An image control unit (18) for storing the final frame image of the fluoroscopic image and displaying it on the display unit, the image control unit corresponding to reversal of the relative position between the X-ray flat panel detector and the subject Then, an inversion processing unit (183) for inverting the stored final frame image (LIH image) is provided. An operation unit (180) for inputting an instruction to invert the final frame image is provided, and the inversion processing unit inverts the final frame image in response to an input from the operation unit.

  In the present invention, “reversing the relative position” means that the X-ray flat panel detector is inverted from the position above or below the subject to the position below or above, that is, placed opposite to the top and bottom across the subject. An object on the X-ray incident surface of the X-ray flat detector while the vertical arrangement of the X-ray source and the X-ray flat detector is inverted and the vertical arrangement of the X-ray source and the X-ray flat detector is maintained. Including any change in the direction of. In the present specification, the former is referred to as upside down, and the latter is referred to as in-plane inversion or up / down / left / right inversion.

  Hereinafter, each embodiment of the X-ray imaging apparatus of the present invention will be described in detail with reference to the drawings, taking an X-ray diagnostic imaging apparatus as an example.

<First embodiment>
FIG. 1 is an overall schematic diagram of the X-ray image diagnostic apparatus, and FIG. 2 is a functional block diagram of an image generation unit of the X-ray image diagnostic apparatus of FIG.

  As shown in FIG. 1, the X-ray diagnostic imaging apparatus 100 mainly includes an X-ray generation apparatus 11, an X-ray tube 12, an X-ray flat panel detector 13, a bed apparatus 14, an image processing apparatus 15, a monitor 16, and an operation unit 17. It has. In addition, the X-ray diagnostic imaging apparatus 100 according to the present embodiment includes an FPD control device 18 that controls an output from the X-ray flat panel detector 13 between the X-ray flat panel detector 13 and the image processing apparatus 15. . The operation unit 17 may be provided as a console integrated with the monitor 16, or an operation provided with a separate switch or operation button connected to the X-ray generation device 11, the image processing device 15, or the like by wire or wirelessly. Tools or both of them may be used.

  The X-ray generator 11 functions as an X-ray source together with the X-ray tube 12, and includes an imaging switch 111 and a fluoroscopic switch 112. When these switches are ON, the X-ray tube 12 has a predetermined X-ray dose. An electric signal for irradiating X-rays is output to the X-ray tube 12. The imaging switch 111 is a switch for irradiating a single X-ray, and the fluoroscopic switch 112 is a switch for continuously irradiating an X-ray. The voltage and current output to the X-ray tube 12 depending on whether imaging or fluoroscopy is performed. Is different. The X-ray tube 12 generates X-rays corresponding to the electrical signal from the X-ray generator 11.

  In addition to FPD, the X-ray flat panel detector 13 is an I.D. It is possible to use a known detector such as I (Image Analyzer), but in this embodiment, an FPD having many advantages such as high resolution and wide dynamics is used.

  The X-ray tube 12 and the FPD 13 are supported by a support device 19 so as to face each other. As the support device 19, for example, an apparatus having an arc-shaped arm, that is, a so-called C-arm that can rotate with respect to the support column can be used. In that case, the X-ray tube 12 and the FPD 13 are fixed at a position 180 ° apart on the arc of the C arm, and the subject that is turned upside down or laid on the bed device 14 by rotating the C arm with respect to the support column. Any angle with respect to 20 can be taken. The FPD 13 is fixed to the C arm so as to be rotatable in a plane parallel to the X-ray irradiation surface. Thereby, the direction with respect to the subject 20 can be changed.

  The bed apparatus 14 includes a mechanism unit (not shown) that moves in the horizontal direction and the vertical direction while the subject 20 is laid down, and changes an angle with respect to a horizontal plane. By these mechanism units, the X-ray tube 12 and Imaging is enabled by changing the relative position of the subject 20 with respect to the FPD 13.

  The FPD control device 18 creates image data for each frame using the electrical signal output from the FPD 13 and sends it to the image processing device 15. Further, the FPD control device 18 has a function of storing a final frame image (LIH image) and displaying it on the monitor 16 in the case of fluoroscopic imaging. The state in which this function is operating is called LIH. Further, when an operation button 180 (to be referred to as an inversion button hereinafter) is operated during the LIH, a process for inverting the displayed LIH image is performed. The function of the FPD control device 18 will be described in detail later.

  The image processing device 15 creates image data for display using the image data sent from the FPD control device 18 and displays it on the monitor 16.

  Next, functions of the image processing device 15 and the FPD control device 18 will be described with reference to the functional block diagram of FIG.

  The FPD control device 18 includes an image generation unit 181, an image data storage unit 182, and an inversion processing unit 183, and these units operate under the control of the main control unit 185. The image generation unit 181 converts the electrical signal output from the FPD 13 into digital data, and generates image data for each frame. The image data storage unit 182 is a memory that temporarily stores the image data for each frame generated by the image generation unit 181. When the fluoroscopy is continued, the image data storage unit 182 is sequentially updated to image data of new frames. When the fluoroscopy is stopped, the LIH function is activated and the image data of the LIH image is held in the image data storage unit 182. The image data held in the image data storage unit 182 is sent to the image processing device 15.

  When the reverse button 180 is operated, the reverse processing unit 183 gives an instruction to perform reverse processing to the image data held in the image data storage unit 182 and passes the instruction to the image processing unit 15. The inversion processing includes processing for inverting image data in which pixels are arranged vertically and horizontally, and processing for inverting vertically. Hereinafter, the process of reversing in the left-right direction is referred to as a left-right reversal process, and the process of reversing in the up-down direction is referred to as a vertical reversal process. The case where both are performed simultaneously is called up / down / left / right reversal processing.

  The inversion button 180 includes, for example, two inversion buttons, an up / down inversion button 180A, and an in-plane inversion button 180B, corresponding to two modes of inversion of the relative positions of the FPD 13 and the subject 20. Or the operation switch which can move an operation switch up and down or right and left in the shape of a joystick may be used. The reverse button 180 is operated by the operator when the relative positions of the subject 20 and the FPD 13 are reversed during LIH. For example, when the relative vertical position of the subject 20 and the FPD 13 is reversed, the operator operates the upside down button 180A. As shown in FIG. 3A, the relative vertical position is inverted when the C arm is inverted and the vertical positions of the X-ray tube 12 and the FPD 13 are inverted. The case where the direction of the subject laid down on the bed apparatus 14 is reversed from upward to downward or from downward to upward is included. Further, as shown in FIG. 4, when the orientation is reversed within the FPD surface of the subject with respect to the FPD 13 during LIH, the operator operates the in-plane reverse button 180B. This case also includes a case where the FPD 13 is reversed with respect to the subject within the plane and a case where the direction of the subject is reversed with respect to the FPD 13. When the subject is turned upside down along with the in-plane inversion, the up-down inversion button 180A is operated together with the in-plane inversion button 180B.

  The inversion processing unit 183 instructs the image processing device 15 to display an image that is horizontally reversed with respect to the image data sent from the image data storage unit 182 to the image processing device 15 when the upside down button 180A is operated. Send to. In addition, when the in-plane reverse button 180B is operated, an instruction to display an image that is inverted vertically and horizontally with respect to the image data stored in the image data storage unit 182 is sent to the image processing device 15. That is, when the reverse button 180 (180A, 180B) is operated, the image data passed from the image data storage unit 182 to the image processing device 15 is subjected to a condition of performing left-right reversal or up-down left-right reversal processing. This process gives a condition for performing a predetermined process on the image data, and is also referred to as “setting a flag on the image data” here.

  The image processing device 15 processes the image data sent from the FPD control device 18 into display image data for display on the monitor 16, and includes a coordinate conversion processing unit 151, a display image creation unit 152, and FPD control. An auxiliary image storage unit 153 is provided that stores other images that are displayed superimposed on the image data sent from the apparatus 18, such as an image frame line and an image of auxiliary information of the image data.

  When the image data sent from the FPD control device 18 has a predetermined flag, that is, a processing condition for the image data is set, the coordinate conversion processing unit 151 performs processing corresponding to the flag. For example, when the upside down button 180A is operated, the pixel values of the pixels arranged in the horizontal direction are set to, for example, “left to right” or “left to right” with respect to the image data in which the pixels are arranged in the vertical and horizontal two-dimensional directions. The rearrangement process and the left / right reversal process are performed. When the in-plane inversion button 180B is operated, for example, a process of rearranging the pixel values arranged in the vertical direction so that “from top to bottom” becomes “from bottom to top” (upside down process) , Both the left-right reversing process described above are performed.

  The display image creation unit 152 creates a display image so that the image data sent from the FPD control device 18 or the image data converted by the coordinate conversion processing unit 151 is displayed on the display screen of the monitor 16 assigned to the image. In addition, if necessary, the image stored in the incidental image storage unit 153 is superimposed on the display image and displayed on the monitor 16.

  Next, based on the configuration of the apparatus described above, an example of an imaging processing procedure using the X-ray image diagnostic apparatus of the present embodiment will be described. FIG. 5 shows a procedure flow.

  First, the X-ray diagnostic imaging apparatus 100 is disposed in the vicinity of the subject 20 laid down on the bed apparatus 14, and the angle of the C-arm is adjusted so that the part to be photographed of the subject 20 is sandwiched between the X-ray tube 12 and the FPD 13. Then, the X-ray diagnostic imaging apparatus 100 is set (S601).

  Next, the fluoroscopic switch 112 of the X-ray generator 11 is operated to start fluoroscopy (S602). As a result, the subject is irradiated with X-rays from the X-ray tube 12, and the image data detected by the FPD 13 is sent to the FPD controller 18. The image data is two-dimensional data having a pixel arrangement corresponding to the arrangement of the detection elements of the FPD 13 for each frame, and is sent to the image processing apparatus 15 via the FPD control apparatus 18 one after another while performing fluoroscopy. Here, the image is converted into a display image and displayed on the monitor 16. This display image is, for example, an image having an angle θ with respect to the axis of the screen corresponding to the FPD 13 as it is when the body axis direction of the subject and one of the vertical and horizontal axes of the FPD 13 have a predetermined angle θ. The subject is displayed as an image seen through from the X-ray tube 12 side.

  While viewing the fluoroscopic image, the operator positions the subject 20 so that the X-ray tube 12 and the FPD 13 are at appropriate positions (S602). The movement of the subject 20, the X-ray tube 12 and the FPD 13 for positioning is relative and includes either or both of movement on the apparatus side and movement on the subject side. When it is confirmed on the fluoroscopic image that it is arranged at a substantially appropriate position, the fluoroscopy is stopped and set to LIH (S603, S604).

  When the fluoroscopy is stopped, the image data storage unit 182 of the FPD control device 18 is in a state where the image data of the last frame, that is, the LIH image is held. The LIH image is sent to the image processing apparatus 15 as it is and displayed on the monitor 16 as a LIH image. If it is determined that shooting can be performed from the displayed LIH image, the shooting switch 111 is operated to start shooting (S607, S609).

  On the other hand, if it is necessary to reverse the C arm or the subject depending on the imaging part, the operator reverses the C arm or the subject and finally determines the position to be photographed. At this time, the reversal buttons 180A and 180B corresponding to the reversal of the relative position between the FPD 13 and the subject 20 performed from the end of fluoroscopy until the position is determined are operated (S605). For example, when the relative vertical position of the subject 20 and the FPD 13 is reversed, the operator operates the up / down button 180A. When the direction of the subject with respect to the FPD is reversed, the operator operates the in-plane reverse button 180B.

  When the reverse button 180 is operated, the FPD control device 18 sets a flag on the image data stored in the image data storage unit 182 and sends the flag to the image processing device 15 according to the type of the operated reverse button. When the image processing apparatus 15 inputs the flagged image data, the coordinate conversion unit 151 causes the input image data to have a left / right reversal flag set, that is, when the up / down reversal button 180A is operated. Reorders the pixels in the left-right direction. The image subjected to the left-right reversal processing in this way is displayed in place of the LIH image that has been displayed on the monitor 16 until then (S606). That is, the LIH image is inverted.

  An example of photographing the hand of the subject 20 is shown in FIG. The upper part of FIG. 6 is a diagram corresponding to FIG. 3A, and shows a state where the position of the hand 21 with respect to the FPD 13 is turned upside down. The state on the left side in this figure (posture A), that is, the LIH image 700 displayed through the LIH function when seen through the palm of the left hand toward the FPD 13 side is as shown in FIG. On the other hand, when the C arm is turned upside down (posture B) and the image is taken, an image 702 shown in (c) is obtained. When the up / down inversion button 180A is operated along with the up / down inversion operation of the C arm during LIH (inversion from the posture A to the posture B in the upper part of FIG. 7), the left / right inversion processing is performed on the LIH image 700 (b ), The LIH image 701 reversed left and right is displayed. This LIH image 701 is an image in the same direction as an image 702 obtained when photographing or fluoroscopy is performed in the posture B shown in FIG.

  7 corresponds to FIG. 4 and shows a state in which the position of the hand 21 with respect to the FPD 13 is rotated 180 degrees within the plane of the FPD 13. In the figure, when fluoroscopy is performed at the left position (posture C) and the LIH image is displayed by the LIH function, the LIH image becomes an image 710 shown in FIG. On the other hand, when the FPD 13 is rotated 180 degrees in the plane or the subject (hand) insertion direction is changed by 180 degrees and photographing is performed (posture D), an image 714 shown in (d) is obtained. Here, by operating the in-plane inversion button 180B, the image processing device 15 performs the upside-down inversion processing (b) and the left-right inversion processing (c) on the LIH image. As a result, the displayed LIH image 713 is an image in the same direction as the image 714 photographed by inverting the relative position of the FPD 13 and the subject in the FPD plane (posture D on the upper right side in FIG. 7).

In this manner, the operator can view the current FPD 13 inverted during LIH and an image in the same direction as the LIH image obtained when seeing through at the position of the subject 20 on the display screen. It can be confirmed whether or not it is properly arranged.
Thereafter, if it is not necessary to change the position again (S608), the photographing switch is operated to perform photographing (S607, S609). The image obtained by shooting is an image in the same direction as the displayed LIH image.

  As described above, according to the present embodiment, when the relative positions of the subject 20, the X-ray tube 12 and the FPD 13 are reversed during LIH, the displayed LIH image is displayed in real space. Since it is possible to display the image by performing processing corresponding to the inversion, it is possible to reduce the time for irradiating X-rays by fluoroscopy in the positioning operation, and the operator can determine whether the position of the subject 20 in the next photographing is appropriate. It can be easily judged.

  In the above embodiment, the case where the operator operates the inversion button to invert the LIH image so as to interlock with the operation to invert the apparatus at the time of positioning is described. However, the inversion processing of the LIH image by the inversion button is performed. It can be performed independently of the apparatus. For example, when there is a reference X-ray image and there is an LIH image obtained by reversing it, the LIH image is reversed and displayed in the same direction as the reference image by operating the reverse button. Is possible. As a result, it is possible to display an image in an orientation that matches the reference image.

<Second embodiment>
The present embodiment is characterized in that the FPD control apparatus or the image processing apparatus includes a rotation processing unit that performs a rotation process on the LIH image.
That is, the X-ray imaging apparatus of the present embodiment includes a rotation mechanism unit in which the X-ray plane detector rotates the X-ray plane detector in a plane parallel to the X-ray incident surface, and the inversion processing unit rotates. In response to the rotation angle of the X-ray flat panel detector and the relative position of the X-ray source / X-ray flat panel detector and the subject by the mechanism unit, the final frame image is inverted and rotated by the same rotation amount as the rotation angle. Is displayed.

  Hereinafter, the X-ray diagnostic imaging apparatus of the present embodiment will be described with reference to the drawings. The apparatus outline of the X-ray diagnostic imaging apparatus according to the present embodiment is the same as that shown in FIG. 1, and FIG. 1 will be referred to as necessary in the following description. FIG. 8 is a functional block diagram of the FPD control device and the image processing device. The same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As described for the X-ray diagnostic imaging apparatus of the first embodiment, in this embodiment as well, the X-ray flat panel detector, here also the FPD 13, has the X-ray tube 12 and the support device 19 that supports the FPD 13 with its X-ray. It is rotatably supported in a plane parallel to the line incident surface. As shown in the block diagram of FIG. 8, the rotation mechanism 190 for rotating the FPD 13 includes an angle input button 191 for inputting the rotation amount of the FPD 13, a rotation control unit 192 for controlling the rotation mechanism 190, and rotation of the FPD 13. An angle sensor 193 for detecting an angle is provided.

  The angle input button 191 is used to pass an input of the rotation angle of the FPD 13 and a rotation drive command to the rotation control unit 192. For example, the angle input button 191 includes input means such as a dial type button or a touch panel or a keyboard that can input an angle using numerical values. It may be a GUI or the like.

  When the angle input button 191 is operated, the rotation control unit 192 sends a command to the rotation mechanism unit 190 to rotate the FPD 13. The rotation mechanism unit 190 is a mechanism including a small motor as a drive source, and rotates the FPD 13 in accordance with a command from the rotation control unit 192. The angle sensor 193 detects the rotation angle of the FPD 13 and sends the detected rotation amount to the rotation control unit 192. The rotation control unit 192 sends a command to the rotation mechanism unit 190 to stop the rotation of the FPD 13 when the rotation angle of the FPD 13 detected by the angle sensor 193 reaches the angle set by the angle input button 191.

  Further, the rotation control unit 192 passes to the FPD control device 18 information related to the rotation of the FPD 13, that is, the fact that the FPD 13 has been rotated during LIH and the positive and negative rotation angles. The rotation angle may be a set angle set by the angle input button 191 or a detection angle detected by the angle sensor 193. In the latter case, the detected angle from the start of rotation to the end of rotation may be detected at a predetermined sampling interval. In this case, angle information is sent to the FPD control device at the sampling interval.

  The FPD control device 18 includes a rotation processing unit 184 in order to reflect the input angle information on the LIH image that is a still image. Based on the angle information from the rotation control unit 192, the rotation processing unit 184 performs processing for setting a flag for performing rotation processing in the subsequent image processing device 15 on the image data stored in the image data storage unit 182.

  Next, the processing procedure of this embodiment will be described. FIG. 9 shows a procedure flow. The same procedures as those shown in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, the X-ray tube 12 and the FPD 13 are arranged across the imaging target portion of the subject 20 laid on the bed apparatus 14 (S601), and the positioning operation is performed while performing fluoroscopy (S602 to S604). It is the same as the form.

  In the present embodiment, it is assumed that the relative position of the FPD 13 with respect to the subject 20 is reversed during LIH and the FPD 13 is rotated within the X-ray incident plane. The reversal of the relative position is a vertical reversal or a vertical reversal and includes a case where the apparatus side is reversed and a case where the subject side is reversed. Before and after such a reversing operation, the FPD 13 is rotated in consideration of the necessity of fine adjustment of the operator's standing position and subject position (S605, S610). That is, the operator operates the angle input button 191 to rotate the FPD 13 by a predetermined angle by the rotation mechanism unit 190. Along with the rotation operation, the relative position of the FPD 13 is turned upside down and, for example, the upside down button 180A is operated.

  In this state, when X-rays are irradiated, the image displayed from the FPD 13 via the FPD control device 18 and the image processing device 15 is the rotation of the FPD 13, in this case, the left rotation, and the top and bottom of the FPD 13 as shown in FIG. The image 720 reflects the inversion. An image 710 in FIG. 10 is an image before the movement of the FPD 13 (posture A). The FPD control device 18 performs processing in which the LIH image becomes an image in the same direction as the image 720 (S611). That is, first, along with the LIH image data stored in the image data storage unit 182, conditions for inversion processing and rotation processing are added and sent to the image processing device 15. Here, the inversion processing is processing in which image data is inverted in the left-right direction in the case of upside-down inversion, as in the first embodiment. The rotation process is performed in the same direction as the rotation direction of the FPD 13 while the rotation process without the reversal process is a rotation direction opposite to the rotation direction of the FPD 13.

  As shown in FIG. 10, when the FPD 13 is rotated to the right without being inverted, for example, an image obtained by irradiating X-rays is an image rotated to the left with respect to the image before the FPD rotation. In order to obtain an image in the same direction as this image by image processing of the LIH image, the LIH image may be rotated in the direction opposite to the FPD rotation direction, that is, rotated to the left. On the other hand, when the reversal process is involved, for example, when the FPD 13 is rotated to the right and turned upside down, an image in the same direction as the image 720 (FIG. 10) obtained by irradiating X-rays in that state is obtained by image processing of the LIH image. For this purpose, as shown in FIG. 11, a left / right inversion process and a rotation process in the same rotation direction as the FPD 13 may be added. In other words, the rotation direction of the LIH image is opposite to that in the case where only the rotation is performed. However, when the rotation process is preceded, the rotation is performed in the reverse direction to the FPD 13 and then the left-right reversal process.

  In any case, the absolute value of the rotation angle is the same as the rotation angle obtained by actually rotating the FPD 13.

  When the reversal operation is performed together with the rotation operation as described above (S610), the rotation processing unit 183 of the FPD control device 18 sets a rotation processing flag for the image data stored in the image data storage unit 182. The image is transferred to the image processing device 15. Similar to the first embodiment, the image processing apparatus 15 performs left-right reversal processing on the LIH image and rotation processing of the input angle. However, the rotation direction is opposite to the case where only rotation is performed, and is set to the same direction as the rotation direction of the FPD 13 input from the rotation control unit 192.

  In the above description, the case where the FPD control device 18 inputs the information for the rotation processing from the rotation control unit 192 that controls the rotation of the FPD 13 is described. However, the FPD control device 18 inputs from the angle input button 191 or the angle sensor 193. It is also possible to adopt a configuration.

  According to this embodiment, even when the FPD is rotated simultaneously with the inversion of the X-ray source and the FPD, an LIH image in the same direction as the X-ray image obtained after the rotation and inversion can be displayed.

<Third embodiment>
The X-ray image diagnostic apparatus according to the present embodiment detects the inversion of the X-ray source and the FPD on the apparatus side, and inverts the LIH image when detecting the inversion.

  That is, the X-ray diagnostic imaging apparatus according to the present embodiment detects a support unit that supports the X-ray source and the X-ray detector so as to face each other, and inversion of the positions of the X-ray source and the X-ray flat detector with respect to the subject. A reversal processing unit for reversing the final frame image when the detection unit detects reversal of the X-ray source and the X-ray flat panel detector.

  In this embodiment, the outline of the apparatus is the same as that in FIG. 1, but is characterized in that the support apparatus 19 is provided with a mechanism for detecting inversion. FIG. 12 shows an outline of the support device 19. The support device of the X-ray diagnostic imaging apparatus according to the present embodiment is such that the support device 19 that supports the X-ray tube 12 and the FPD 13 rotates the C arm 195 with the X-ray tube 12 and the FPD 13 fixed at both ends, and the C arm 195. The C arm 195 is supported by a C arm support portion 197 that is rotatably attached to an axis (not shown) fixed to the column 196. The support unit 197 includes a detection unit 198 that detects the reversal operation. As the detection unit 198, for example, a solenoid switch that is turned on in accordance with the reversing operation of the support unit 197 can be used. A signal from the detection unit 198 is input to the FPD control device 18.

  When the signal from the detection unit 198 is input during LIH, the FPD control device 18 sets a left / right reversal processing flag on the image data of the LIH image and sends the flag to the image processing device 15. As a result, the image processing device 15 performs the left-right reversal processing on the image data and displays the image data on the monitor 16 as in the first embodiment. When the reversal operation is accompanied by the rotation of the FPD 13, similarly to the second embodiment, the left / right reversal and rotation processes are performed and displayed on the monitor 16.

  According to the present embodiment, it is possible to automatically perform the LIH image inversion process without operating the inversion button.

  According to the present invention, by providing a function of inverting an LIH image during LIH, exposure to the subject can be reduced during positioning, and an image that the operator always wants to view is displayed. Can do.

DESCRIPTION OF SYMBOLS 11 ... X-ray generator, 12 ... X-ray tube, 13 ... FPD (planar X-ray detector), 14 ... Bed apparatus, 15 ... Image processing apparatus, 16 ... Monitor , 17 ... operation unit, 18 ... FPD control device (image control unit), 19 ... support device, 151 ... coordinate conversion unit, 152 ... display image creation unit, 153 ... incidental Image storage unit 180... Reverse button, 180 A. Upside down button, 180 B. In-plane reverse button 181... Image generation unit 182... Image data storage unit 183. , 184... Rotation processing unit, 190... Rotation mechanism, 191... Angle input button, 192. ..Supports, 197 ... C arm support, 198 ... detection .

Claims (6)

An X-ray source that irradiates X-rays, an X-ray flat detector that is disposed opposite to the X-ray source and detects X-rays transmitted through a subject, and transmitted X-rays detected by the X-ray flat detector An image generation unit that generates an image of the subject based on the display unit, a display unit that displays an image generated by the image generation unit, and an image control unit that stores a final frame image of a fluoroscopic image and displays the image on the display unit. Prepared,
The image control unit includes an inversion processing unit that inverts the stored final frame image (LIH image) corresponding to inversion of a relative position between the X-ray flat panel detector and the subject. X-ray equipment.   The X-ray imaging apparatus according to claim 1, further comprising an operation unit that inputs an instruction to invert the final frame image, wherein the inversion processing unit receives the final frame image in accordance with an input from the operation unit. An X-ray imaging apparatus characterized by being inverted.   3. The X-ray imaging apparatus according to claim 1, wherein the reversal processing unit includes the final frame image when the positions of the X-ray source and the X-ray flat panel detector with respect to the subject are reversed up and down. X-ray imaging apparatus characterized by reversing left and right.   3. The X-ray imaging apparatus according to claim 1, wherein the reversing processing unit moves the final frame image vertically and horizontally when the position of the X-ray flat panel detector with respect to the subject is reversed in a horizontal plane. An X-ray imaging apparatus characterized by being inverted.   The X-ray imaging apparatus according to claim 1, wherein the X-ray flat panel detector includes a rotation mechanism unit that rotates the X-ray flat panel detector in a plane parallel to the X-ray incident surface, and the inversion The processing unit inverts the final frame image in accordance with the rotation angle of the X-ray plane detector and the inversion of the relative position between the X-ray plane detector and the subject by the rotation mechanism unit and the rotation angle. An X-ray imaging apparatus which displays the image by giving the same rotation amount as in FIG. The X-ray imaging apparatus according to claim 1, further comprising a support unit that supports the X-ray source and the X-ray detector so as to face each other, and the X-ray source and the X-ray plane detection for the subject. A detector that detects inversion of the position of the detector, and the inversion processor inverts the final frame image when the detector detects inversion of the X-ray source and the X-ray flat panel detector. A featured X-ray imaging apparatus.

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