JP2006314704A - X-ray image-based diagnosis apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray image-based diagnosis apparatus which can correct a position of an examinee without increasing an exposure dose. <P>SOLUTION: This apparatus is equipped with a top board 15 to place the examinee P, a mechanism section 3 to move the top board 15 in longitudinal and lateral directions, an X-ray generating section 1 to irradiate the examinee P with X-rays, an X-ray detecting section 2 to detect the X-rays from the X-ray generating section 1, an image data processing section 6 to produce the first and the second image data out of the X-ray projection data from the X-ray detecting section 2, a floodlight projector 23 which emits light to a surface of the top board 15 and forms a reference point on the top board 15, and the position of the examinee correcting section 91 which corrects the difference between the reference point and a prescribed region of the examinee P, wherein the position of the examinee correcting section 91 calculates the difference between the first positional information of the examinee on the top board 15 which makes the prescribed region of the examinee P on the top board 15 for producing the first image data coincide with the reference point and the second positional information of the examinee on the top board 15 which makes the prescribed region of the examinee P on the top board 15 for producing the second image data coincide with the reference point and corrects the difference by moving the top board 15 with the mechanism section 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an X-ray diagnostic imaging apparatus, and more particularly to an X-ray diagnostic imaging apparatus that can perform X-ray imaging by correcting the position of a subject placed on a top board.

  In recent years, cardiovascular examinations using X-ray diagnostic imaging equipment have been developed for cardiovascular and other systemic arteriovenous diagnosis and treatment with the development of angiographic examinations using catheters and IVR (Interventional Radiology). Advances have been made mainly, and it is often performed by X-ray imaging of a blood vessel in which a contrast medium is injected into the blood vessel to enhance contrast. And the X-ray imaging requires grasping the exact position of an affected part such as a blood vessel.

  In order to meet such a demand, an X-ray diagnostic imaging apparatus includes an X-ray generation unit, a C-arm that supports an X-ray detection unit disposed opposite to the X-ray generation unit, and a top plate on which a subject is placed. And the X-ray fluoroscopy and X-ray imaging of the affected part of the subject are enabled by setting the C-arm and the top plate to the optimal imaging angle and position with respect to the subject.

  By the way, the X-ray diagnostic imaging apparatus has an auto-positioning function that can be set to an imaging condition simply by specifying a number corresponding to the registration by registering imaging conditions such as the C-arm imaging angle in advance. Some are provided (for example, see Patent Document 1).

  In addition, the X-ray diagnostic imaging apparatus stores an imaging condition such as an imaging angle of the image data together with the image data obtained by X-ray imaging so that the same imaging conditions as the image data can be easily set. (For example, refer to Patent Document 2).

  At the time of diagnosis, an auto-positioning function or the like is used to preliminarily set the subject to desired imaging conditions, and then X-ray imaging is performed, and a treatment site is determined based on image data obtained from the X-ray imaging. The

  When treatment is performed with reference to the image data, the imaging conditions such as the C-arm imaging angle are set to the same conditions as the reference image data using the auto angle function, and then the reference image data is referred to. Then, treatment is performed by advancing the catheter or the like to the target site in the blood vessel while viewing fluoroscopic image data that is fluoroscopically seen from the same imaging position as the reference image data.

Furthermore, in the follow-up after treatment, the subject is set to the same imaging conditions as during treatment, and X-ray fluoroscopy, X-ray imaging, etc. are performed.
Japanese Patent Laid-Open No. 2003-210447 Japanese Patent Laid-Open No. 2-140149

  However, even if the imaging conditions such as the C-arm imaging angle and the position of the top board are set to the same conditions as the previous time, the position of the subject placed on the top board is determined at the time of diagnosis and at the time of treatment or at the time of treatment. Since it is not always the same at the time of subsequent follow-up, the position of the subject is corrected by adjusting the C-arm or the top panel by comparing the fluoroscopic image data with the previous image data while performing X-ray fluoroscopy. In this case, there is a problem that the amount of exposure of the subject by X-ray fluoroscopy increases in order to bring the subject to the same position as the previous time.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an X-ray diagnostic imaging apparatus that can correct the position of a subject without increasing the amount of exposure.

  In order to solve the above problem, an X-ray diagnostic imaging apparatus according to claim 1 of the present invention includes a top plate on which a subject is placed, and a top plate movement that moves the top plate in a longitudinal direction and a width direction. An X-ray generating means for irradiating the subject with X-rays, and an X-ray emitted from the X-ray generating means. X-ray detection means, image data processing means for generating first and second image data from the X-ray projection data output by the X-ray detection means, and light applied to the surface of the top board A light projecting means for setting a reference point on the top board; and a subject position correcting means for correcting a difference between the reference point on the top board and a predetermined portion of the subject. The position correction means is configured to perform a previous operation during X-ray irradiation for generating the first image data. First object position information of the top plate that matches a predetermined part of the subject placed on the top plate with the reference point, and the X-ray irradiation for generating the second image data The difference between the predetermined position of the subject placed on the top plate and the second subject position information of the top plate that matches the reference point is calculated, and the difference is calculated by the top plate moving means. The correction is made by moving the plate.

  The X-ray diagnostic imaging apparatus according to claim 2 is attached to an arm, a top plate on which a subject is placed, a top plate moving means for moving the top plate in a longitudinal direction and a width direction, and the arm. X-ray generation means for irradiating a subject with X-rays, X-ray detection means arranged to face the X-ray generation means and detecting X-rays emitted from the X-ray generation means, and the X-rays Image data processing means for generating first and second image data from the X-ray projection data output by the detection means, and irradiating light on the surface of the top board to set a reference point on the top board A difference between a light projecting unit, an X-ray moving unit that horizontally moves the arm in a longitudinal direction and a width direction of the top plate, the reference point on the top plate, and a predetermined predetermined portion of the subject. Subject position correcting means for correcting, the subject position correcting means, the first position The first subject position of the X-ray generation means and the X-ray detection means for matching a predetermined portion of the subject placed on the top plate with the reference point at the time of X-ray irradiation for generating image data X-ray generation means and X-ray detection means for matching information and a predetermined part of the subject placed on the top plate at the time of X-ray irradiation for generating the second image data to the reference point The difference with the second object position information is calculated, and the difference is corrected by moving the arm by the X-ray moving means.

  Furthermore, the X-ray diagnostic imaging apparatus according to claim 3 is irradiated from the top plate on which the subject is placed, X-ray generation means for irradiating the subject with X-rays, and the X-ray generation means. X-ray detection means for detecting the detected X-ray, and information on the first initial position and information on the second initial position of the top plate, the X-ray generation means, and the X-ray detection means are stored. The information on the first initial position and the information on the second initial position are read out from the inspection information storage means, the inspection information storage means, and the information on the first initial position and the second initial position. And a subject position correcting means for correcting the at least one position by calculating a difference from the above information.

  According to the present invention, the X-ray fluoroscopy or X-ray of the second image data is obtained by obtaining the first position of the top or C-arm at the reference point position of the subject at the time of X-ray imaging of the first image data. Since the subject can be set to the same position as the first position by correcting the difference from the second position obtained at the time of imaging and moving the top plate or the C-arm, X for adjusting the position of the subject There is no need for fluoroscopy, and the amount of exposure to the subject can be reduced.

  Examples of the present invention will be described.

  Embodiments of the X-ray diagnostic imaging apparatus according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a block diagram showing a configuration of an X-ray image diagnostic apparatus according to an embodiment of the present invention. This X-ray diagnostic imaging apparatus 100 is arranged in two dimensions to an X-ray generator 1 that irradiates a subject P with X-rays and an X-ray that is disposed opposite to the X-ray generator 1 and transmitted through the subject P. An X-ray detector 2 that detects and generates X-ray image data based on the X-ray detection data, a C-arm 5 that supports the X-ray generator 1 and the X-ray detector 2, and a subject P are mounted. And a high voltage generator 4 that generates a high voltage necessary for X-ray irradiation in the X-ray generator 1.

  The X-ray diagnostic imaging apparatus 100 also includes reference mechanism data and fluoroscopic image data based on X-ray projection data formed by the mechanism unit 3 that moves the C-arm 5 or the top plate 15 and the X-ray detection unit 2. The image data processing unit 6 that generates and stores the image data and the like, and the display unit 7 that displays the image data from the image data processing unit 6 are provided.

  Further, the X-ray image diagnostic apparatus 100 includes an operation unit 8 for selecting and inputting various conditions and inputting various commands, an X-ray generation unit 1, an X-ray detection unit 2, a high voltage of the X-ray image diagnostic apparatus 100. And a system control unit 9 that controls each unit such as the generation unit 4, the mechanism unit 3, the image data processing unit 6, and the display unit 7.

  The X-ray generation unit 1 includes an X-ray tube 11 that irradiates the subject P with X-rays, an X-ray opening degree adjusting mechanism, and a controller thereof, and irradiation of the X-ray beam emitted from the X-ray tube 11. Compensation filter 13 having an X-ray diaphragm 12 that adjusts the range to form an X-ray weight (cone beam), a drive mechanism that moves the insertion position of the compensation filter, and its controller, and that adjusts the X-ray transmittance And.

  The X-ray detection unit 2 is disposed opposite to the X-ray generation unit 1, detects an X-ray transmitted through the subject P, and converts it into light, and converts the image intensifier 21 with the image intensifier 21. A television camera 22 that forms light into X-ray projection data, which is an electrical signal, and further converts the X-ray projection data formed in the television camera 22 into a digital signal, which is then output to the image data processing unit 6. Further, the X-ray detection unit 2 includes a projector 23 that irradiates the subject P with light.

  Although not shown, the image intensifier 21 includes a moving mechanism capable of moving the position of the image intensifier 21 back and forth with respect to the X-ray tube 11 direction and a controller thereof. The distance (SID) between them can be adjusted. The image intensifier 21 has an X-ray image receiving surface (not shown) on which X-rays transmitted through the subject P are incident. The image intensifier 21 controls the electrode voltage to input an X-ray input field size (FOV) on the X-ray image receiving surface. ) Can be adjusted.

  The projector 23 includes a light emitting element such as a semiconductor laser or a light emitting diode, and irradiates light toward the X-ray generator 1. The light emitted from the projector 23 forms a reference point for aligning the subject position of the subject P placed on the top 15.

  The mechanism unit 3 includes a top plate moving mechanism 32 having a mechanism for horizontally moving the top plate 15 on which the subject P is placed in the longitudinal direction, horizontally moving in the width direction, and moving up and down. The C-arm rotation mechanism 31 that rotates the C-arm 5 that supports the X-ray generation unit 1 and the X-ray detection unit 2 around the subject P, and the top plate movement mechanism 32 and the C-arm rotation mechanism 31 are controlled. And a C-arm / top plate mechanism control unit 33.

  The C-arm / top plate mechanism control unit 33 controls the C-arm rotation mechanism 31 in accordance with an instruction from the system control unit 9 to rotate the C-arm 5 or move the top plate 15. The image magnification (magnification rate) is determined by setting the speed and the like and setting the optimum SID for the diagnosis target region of the subject P.

  Next, FIG. 2 is a diagram for explaining imaging angles of the X-ray generation unit 1 and the X-ray detection unit 2 driven by the C-arm rotation mechanism 31.

  In FIG. 2 showing a schematic configuration of the X-ray generation unit 1 and the X-ray detection unit 2 and the C-arm 5 and the C-arm rotation mechanism 31 for moving them, the support 35 installed on the floor or ceiling The C-arm rotation mechanism 31 is supported so as to be rotatable in the R1 direction with the body axis direction of the subject P as the rotation axis.

  Further, the C arm 5 is attached to the C arm rotation mechanism 31 so as to be slidable in the R2 direction, and the X-ray generation unit 1 and the X-ray detection unit 2 face each other near both ends of the C arm 5. Is provided.

  Then, the X-ray generation unit 1 and the X-ray detection unit 2 turn the C arm 5 in the R2 direction, for example, with the affected part (for example, the heart) of the subject P as the rotation center (isocenter) C0 of the X-ray beam. Rotation is performed in the part direction (CRA) and the foot direction (CAU).

  The X-ray generation unit 1 and the X-ray detection unit 2 rotate the C arm 5 in the R1 direction, for example, with the affected part of the subject P as an isocenter, for example, the first oblique direction (RAO) and the second oblique direction ( LAO).

  As described above, the X-ray generator 1 and the X-ray detector 2 rotate in directions such as RAO, LAO, CRA, and CAU as the C-arm 5 rotates in the R1 and R2 directions. The movement enables X-ray imaging of the subject P from an arbitrary imaging angle.

  Next, the high voltage generator 4 shown in FIG. 1 generates a high voltage to be applied between the anode and the cathode in order to accelerate the thermal electrons generated from the cathode of the X-ray tube 11. And an X-ray controller 41 that controls X-ray irradiation conditions such as tube current, tube voltage, and irradiation time in the high voltage generator 42 in accordance with an instruction signal from the system controller 9.

  The image data processing unit 6 generates various image data from the X-ray projection data output in units of lines from the X-ray detection unit 2, and the image data generated by the image data generation unit 61. An image data storage unit 62 to be stored.

  The image data generation unit 61 has a function of generating fluoroscopic image data from the X-ray projection data output from the X-ray detection unit 2. In addition, it has a function of generating DA image (Digital Angiography) data from X-ray projection data in a state in which a contrast medium is injected into the blood vessel of the subject P.

  Further, the image data generation unit 61 performs DSA (Digital Subtraction Angiography) by differential processing of mask image data and contrast image data obtained under almost the same imaging angle and other imaging conditions before and after the injection of the contrast medium into the blood vessel of the subject P. ) It has a function to generate image data.

  The image data storage unit 62 includes subject information such as the subject ID and name of the subject P, imaging, and image data such as fluoroscopic image data, DA image data, and DSA image data generated by the image data generation unit 61. The imaging conditions such as the time, the imaging angle of the C-arm 5, the magnification of the image, the top plate position in the vertical / longitudinal / width directions of the top 15, the still image or moving image, the imaging target region, the X-ray irradiation conditions, etc. To save the information.

  The display unit 7 combines the image data generated in the image data processing unit 6 with the display data generation circuit (not shown) that generates display data by combining numbers and various characters, which are incidental information, and the image data. And a conversion circuit (not shown) that performs D / A conversion and TV format conversion on the incidental information data to generate a video signal, and a liquid crystal panel or CRT monitor 71 and monitor 72 for displaying the video signal. .

  The fluoroscopic image data generated in the image data generating unit 61 of the image data processing unit 6 is mainly displayed on the monitor 71 and stored in the reference image data such as DA image data and DSA image data, or in the image data storage unit 62. The displayed image data is mainly displayed on the monitor 72.

  The operation unit 8 is an interactive interface including an input device such as a keyboard, a trackball, a joystick, and a mouse, a display panel, and various switches, and subject information such as a subject ID and a name of the subject P. Imaging of imaging time, imaging angle of C-arm 5, magnification of image, top plate position in top / bottom direction / longitudinal direction / width direction of top plate 15, still image or moving image, part to be photographed, X-ray irradiation condition, etc. Input conditions and various commands.

  The X-ray irradiation conditions include tube voltage applied to the X-ray tube 11, tube current, X-ray irradiation time, etc., and subject information includes age, gender, physique in addition to subject ID and name. , Inspection part, inspection method, past diagnosis history, etc.

  The system control unit 9 includes a subject position correction unit 91 that corrects the position of the subject P on the top board 15, a test information storage circuit 92 that stores test information such as subject information and imaging conditions, and a CPU (not shown). And once storing an operator command signal, inspection information, and the like supplied from the operation unit 8, generation of X-ray projection data based on these information, generation and display of the above-described various image data, or Controls the entire system, including controls related to moving mechanisms.

  In addition, the system control unit 9 stores the shooting conditions such as the shooting angle of the C arm 5 registered in advance by the input from the operation unit 8, and further sets the shooting conditions by auto-positioning operation from the operation unit 8. Has a positioning function. This function is used for preliminary setting of imaging conditions in X-ray transmission and X-ray imaging.

  Further, the system control unit 9 reads out the shooting conditions such as the shooting angle of the C arm 5 attached to the desired reference image data from the image data storage unit 62 by the auto angle operation from the operation unit 8 and sets the shooting conditions. It has an auto angle function. This function is used when X-ray transmission or X-ray imaging is desired to be set to the same imaging conditions as desired reference image data.

  Hereinafter, an example of the operation of the X-ray image diagnostic apparatus 100 in the step of performing diagnosis and the step of performing treatment based on the diagnosis result will be described with reference to FIGS. 1 to 8.

  FIG. 3 is a flowchart showing the operation of the X-ray image diagnostic apparatus 100 for making a diagnosis and the operation of the X-ray image diagnostic apparatus 100 corresponding to the operation.

  An operator of the X-ray diagnostic imaging apparatus 100 inputs setting of examination information A on the subject P from the operation unit 8 in order to conduct examination A on the subject P.

  In response to the input of examination information A from the operation unit 8, the X-ray diagnostic apparatus 100 starts operating (step S1). Then, the system control unit 9 stores the examination information A of the subject P in the examination information storage circuit 92 (Step S2).

  Next, after placing the subject P on the top 15, an operation for accurately grasping the position of the subject P on the top 15 is performed.

  First, the system control unit 9 instructs the C-arm / top plate mechanism control unit 33 of the mechanism unit 3 to move the subject position to the home position by the home position operation of the subject position alignment from the operation unit 8. . Then, the C arm / top plate mechanism control unit 33 controls the C arm rotation mechanism 31 and the top plate moving mechanism 32 in accordance with instructions from the system control unit 9 so that the C arm 5 and the top plate 15 are brought to their home positions. Set (step S3).

  Further, the projector 23 of the X-ray detection unit 2 emits light by the lighting operation of the projector from the operation unit 8 (step S4).

  FIG. 4A is a view of the position of the top 15 at the home position for alignment of the subject P as viewed from above. The rectangular top plate 15 is arranged so that the upper surface thereof is horizontal. Further, the subject P is placed on the top 15 in the supine position, and is placed near the center in the width direction of the top 15. The longitudinal direction of the top plate 15 is represented by the X axis, the width direction is represented by the Y axis, and the X and Y coordinates of the corner 15a of the top plate 15 are represented by (0, 0).

  The C-arm 5 is set to an imaging angle at which the light from the projector 23 of the X-ray detection unit 2 irradiates the upper surface of the top plate 15 perpendicularly, and the light from the projector 23 is, for example, the short side at one end in the longitudinal direction of the top plate 15. The vicinity of the center is irradiated, and the irradiation point is set as a reference point.

  Then, it is assumed that the nose tip Pa of the subject P is, for example, a position away from the reference point by a distance H1 in the longitudinal direction of the top plate 15 and at the center in the width direction.

  Next, the operator moves the top 15 horizontally in the longitudinal direction or the width direction by, for example, operating the operation unit 8 in order to align the nose tip Pa of the subject P with the reference point. After the nose tip Pa of the subject P moves to a position that matches the reference point, the subject position registration operation is performed from the operation unit 8 with the position as the initial position.

  FIG. 4B is a top view of the top 15 after the subject position registration operation. The nose tip Pa of the subject P coincides with the reference point at the initial position where the top 15 has moved the distance H1 in the direction of the arrow L1 shown in FIG. The X and Y coordinates of the corner 15a of the top 15 at the initial position are (H1, 0). For example, the X and Y coordinates (H1, 0) are stored in the examination information storage circuit 92 as the subject position information A. The

  Thus, by subject position registration operation from the operation unit 8, the system control unit 9 obtains the position information of the top 15 at that time, that is, subject position information A, from the C arm / top plate mechanism control unit 33. Then, it is stored in the inspection information storage circuit 92 together with the inspection information A (step S5 in FIG. 3).

  Next, by auto-positioning operation from the operation unit 8, the system control unit 9 issues a preliminary setting instruction for setting each unit such as the C arm 5 to pre-registered shooting conditions such as the shooting angle of the C arm 5. In the case of the C arm 5, the C arm / top plate mechanism control unit 33 controls the C arm rotation mechanism 31 in accordance with an instruction from the system control unit 9 to set the C arm 5 to the registered photographing angle. (Step S6 in FIG. 3).

  Further, when each unit is the top plate 15, the C-arm / top plate mechanism control unit 33 controls the top plate moving mechanism 32 in accordance with an instruction from the system control unit 9, and sets the top plate 15 to the top plate setting operation signal. (Step S6 in FIG. 3).

  As described above, in the same manner as in the case of the top plate 15, the other units also set the units to the shooting conditions of the setting operation signal according to the instruction from the system controller 9 (step S6 in FIG. 3). .

  After auto-positioning and preliminary setting of each unit, the system control unit 9 performs a high voltage generation unit 4, an X-ray generation unit 1, an X-ray detection unit 2, and an image data processing unit 6 by an X-ray fluoroscopic operation from the operation unit 8. Then, the display unit 7 is instructed to start the operation of each unit. Then, the X-rays irradiated from the X-ray generation unit 1 by the voltage from the high voltage generation unit 4 pass through the subject P to form X-ray projection data in the X-ray detection unit 2, and the image data processing unit 6 The image data generation unit 61 processes the X-ray projection data to generate fluoroscopic image data and displays it on the monitor 71 of the display unit 7 (step S7 in FIG. 3).

  Next, the operator adjusts the imaging positions of the C-arm 5, the top plate 15, and the like by operating from the operation unit 8 so that the affected part of the subject P is in an optimal position while looking at the monitor 71. An imaging condition A such as an imaging angle A and a top board position A is determined.

  Then, the system control unit 9 inspects the imaging conditions A such as the imaging angle A and the top position A together with the inspection information A by the input operation of the imaging conditions A such as the imaging angle A and the top position A from the operation unit 8. The information is stored in the information storage circuit 92.

  Next, by the X-ray imaging operation from the operation unit 8, the image data storage unit 62 of the image data processing unit 6 generates a reference generated by the image data generation unit 61 of the image data processing unit 6 in accordance with the timing of the signal. The image data A is stored (step S8 in FIG. 3). Further, the image data storage unit 62 stores the inspection information A stored in the inspection information storage circuit 92 of the system control unit 9 together with the reference image data A in accordance with the timing (step S8 in FIG. 3).

  Next, the system control unit 9 instructs the high voltage generation unit 4, the X-ray generation unit 1, the X-ray detection unit 2, the image data processing unit 6, and the display unit 7 by an X-ray imaging end operation from the operation unit 8. Thus, when the operation of each unit is stopped, the inspection is completed (step S9 in FIG. 3).

  After the examination is completed, the doctor in charge of the subject P examines the subject P by displaying the reference image data A on the monitor 72 and makes a treatment plan, and then the diagnosis is finished.

  Next, a case where the subject P is treated using the reference image data A that has been X-rayed at the time of diagnosis will be described.

  FIG. 5 is a flowchart showing an operation procedure for performing treatment and an operation of the X-ray image diagnostic apparatus 100 corresponding to the operation.

  The operator performs setting input of examination information B such as subject information and imaging conditions in order to conduct examination B of the subject P from the operation unit 8.

  The X-ray diagnostic apparatus 100 starts to operate by inputting examination information from the operation unit 8 (step S11). Then, the system control unit 9 stores the examination information B of the subject P in the examination information storage circuit 92 (step S12).

  After placing the subject P on the top 15, the C-arm rotation mechanism 31 is operated similarly to the operation in step 3 of FIG. 3 by operating the home position for subject alignment from the operation unit 8. The C-arm 5 is set at a shooting angle at which the light from the projector 23 irradiates the top surface of the top plate 15 perpendicularly, and the top plate moving mechanism 32 allows the light from the projector 23 to be near the center of one short side of the top plate 15. The top plate 15 is set at the irradiation position (step S13).

  Next, the projector 23 of the X-ray detection unit 2 emits light by the projector lighting operation from the operation unit 8 (step S14).

  FIG. 6A is a top view of the top 15 at the home position for subject alignment. On the top 15, the subject P is placed in a supine position with its body axis parallel to the longitudinal direction of the top 15. The X and Y coordinates of the corner 15a of the top plate 15 are represented by (0, 0) as in FIG. 4 (a).

  The nose tip Pa of the subject P is, for example, at the position of the distance H2 (H2> H1) in the longitudinal direction of the top 15 from the reference point and at the position of the distance W on the left hand side of the subject P from the center in the width direction. To do.

  Next, the operator moves the top 15 horizontally in the longitudinal direction or the width direction in order to align the subject P with the reference point by operating the operation unit 8, and the nose tip Pa of the subject P matches the reference point. Move to the position to be. Then, the subject position registration operation is performed from the operation unit 8 with the position as an initial position.

  FIG. 6B is a top view of the top 15 after the subject position registration operation. The nasal tip Pa of the subject P coincides with the reference point at the initial position where the top 15 has moved the distance H2 in the arrow L1 direction and the distance W in the arrow L2 direction shown in FIG. The X and Y coordinates of the corner 15a of the top 15 at the initial position are (H2, W). For example, the X, Y coordinates (H2, W) are stored in the examination information storage circuit 92 as subject position information B. The

  By the subject position registration operation from the operation unit 8, the system control unit 9 obtains the position information (subject position information B) of the top 15 at that time from the C-arm / top plate mechanism control unit 33, and the examination information The subject position information B is stored in the examination information storage circuit 92 together with B (step S15 in FIG. 5).

  Next, by the examination list display operation of the subject P from the operation unit 8, the image data storage unit 62 of the image data processing unit 6 reads out all the examination information of the subject P stored therein and lists them. Is output to the monitor 71, and the monitor 71 displays a list of the inspection information (step S16 in FIG. 5).

  Then, the inspection information A is selected from the inspection information displayed on the monitor 71, and further, for example, by the auto-angle operation of the reference image data A included in the inspection information A, the image data storage unit 62 stores the inspection information A. The imaging conditions such as the imaging angle A attached to the reference image data A are read and output to the system control unit 9. For example, in the case of the shooting angle A, the system control unit 9 instructs the C arm / top plate mechanism control unit 33, and the C arm / top plate mechanism control unit 33 rotates the C arm according to the instruction from the system control unit 9. The mechanism 31 is controlled to set the C arm 5 to the shooting angle A (step S17 in FIG. 5).

  The system control unit 9 instructs the C-arm / top plate mechanism control unit 33 by, for example, a setting operation of the top plate position A from the operation unit 8. Then, the C arm / top plate mechanism control unit 33 controls the C arm rotation mechanism 31 in accordance with an instruction from the system control unit 9 to set the top plate 15 to the top plate position A (step S17 in FIG. 5). . Further, the control unit of each unit sets each unit to the shooting condition A based on an instruction from the system control unit 9 by setting input of various other shooting conditions A from the operation unit 8 (step of FIG. 5). S17).

  Further, the subject position correcting unit 91 of the system control unit 9 causes the subject position information A related to the examination information A from the image data storage unit 62 by the subject position correcting operation related to the examination information A from the operation unit 8. Is read. In addition, the subject position correction unit 91 reads the subject position information B stored in the examination information storage circuit 92 of the system control unit 9 and reads the subject position information A and the top 15 of the subject position information B. A difference in the top position is calculated from the X and Y coordinates, and a top correction position for correcting the difference in the position of the subject P on the top 15 in the examination information A and the examination information B is obtained (step S18 in FIG. 5). .

  FIG. 7 is a diagram for explaining the top plate correction position. 7A shows the same X and Y coordinates of the position of the top 15 at the time of diagnosis in FIG. 4B and at the time of treatment in FIG. 6B. Since the nose tip Pa of the subject P is matched with the reference point, the position of the subject P matches and a difference occurs in the position of the top 15. The difference in the position of the top 15 corresponds to the difference in the position of the subject P on the top 15 at the time of diagnosis and treatment.

  The subject P at the time of treatment in step S17 is represented by the position of the subject at the time of treatment indicated by the solid line in FIG. 7B, and the subject P at the time of diagnosis is indicated by the broken line in FIG. 7B. It is represented by the position of the subject at the time of diagnosis. That is, the position of the subject at the time of diagnosis is a position shifted by a distance W in the L2 direction and a distance (H2-H1) in the L1 direction with respect to the position of the subject at the time of treatment shown by the solid line in FIG. Become.

  Therefore, the top plate 15 at the time of treatment can be adjusted to the position of the subject P at the time of diagnosis by horizontally moving the distance 15 in the L2 direction and the distance (H2-H1) in the L1 direction.

  Therefore, following step S18, the subject position correcting unit 91 of the system control unit 9 instructs the C-arm / top plate mechanism control unit 33 to horizontally move the top plate 15 to the top plate correction position. Then, the C-arm / top plate mechanism control unit 33 controls the C-arm rotation mechanism 31 in accordance with an instruction from the system control unit 9 to move the top plate 15 to the distance W in the L2 direction and to the distance (H2-H1) in the L1 direction. ) The position is set to the horizontally moved position (step S19 in FIG. 5).

  Next, by display operation of the reference image data A from the operation unit 8, the image data storage unit 62 reads the reference image data A and outputs it to the monitor 72 via the image data generation unit 61. Data A is displayed (step S20). Further, by the X-ray fluoroscopic operation from the operation unit 8, the monitor 71 displays the fluoroscopic image data B obtained by X-raying the subject P from the same imaging position as the reference image data A, as in Step 7 of FIG. 3. (Step S21).

  FIG. 8 is a diagram showing a reference image A corresponding to the reference image data A displayed on the screen 72 a of the monitor 72 of the display unit 7. A contrast agent is injected into the blood vessel of the subject P, and the blood vessel is emphasized and displayed by the contrast agent.

  The doctor in charge of the subject P inserts a catheter or the like into the blood vessel of the subject P, for example, refers to the reference image 72b, and moves the catheter displayed on the fluoroscopic image B corresponding to the fluoroscopic image data B to the affected area. And treat.

  At the time when the treatment work is finished, the system control unit 9 performs the high voltage generation unit 4, the X-ray generation unit 1, the X-ray detection unit 2, and the image data processing unit by an X-ray imaging end operation from the operation unit 8. 6. When the display unit 7 is instructed to stop the operation of each unit, the inspection B ends (step S22 in FIG. 5).

  According to the embodiment of the present invention described above, when the first image data is X-rayed, the top plate on which the subject is placed is moved horizontally so that the subject is aligned with the reference point from the projector. A first position is determined and stored with the first image data. Then, at the time of X-ray fluoroscopy or X-ray imaging of the second image data, the first position is read and the difference from the second position obtained in the same manner as the first position is corrected to correct the top plate. By moving the subject, the subject can be set at the same position as the first position. Therefore, X-ray fluoroscopy for adjusting the position of the subject is not necessary, and the amount of exposure to the subject can be reduced.

  The present invention is not limited to the above embodiment. For example, when the C-arm is movable in the longitudinal direction and the width direction of the top plate, the C-arm is moved horizontally to adjust the reference point to the subject. The first position and the second position of the arm may be obtained, the difference between them may be corrected, and the C arm may be moved.

1 is a block diagram showing a configuration of an X-ray image diagnostic apparatus according to an embodiment of the present invention. The figure which shows operation | movement of the arm which concerns on the Example of this invention. The flowchart which shows operation | movement of the X-ray-image diagnostic apparatus at the time of the diagnosis based on the Example of this invention. The figure which shows the position of the top plate and subject at the time of diagnosis which concerns on the Example of this invention. The flowchart which shows operation | movement of the X-ray image diagnostic apparatus at the time of the treatment based on the Example of this invention. The figure which shows the position of the top plate and the subject at the time of the treatment which concerns on the Example of this invention. The figure for demonstrating the top-plate position correction | amendment which concerns on the Example of this invention. The figure which shows an example of the reference image which concerns on the Example of this invention.

Explanation of symbols

P Subject 1 X-ray generation unit 2 X-ray detection unit 3 Mechanism unit 4 High voltage generation unit 5 C arm 6 Image data processing unit 7 Display unit 8 Operation unit 9 System control unit 23 Projector 31 C arm rotation mechanism 32 Top plate Moving mechanism 33 C-arm / top plate mechanism control unit 61 Image data generation unit 62 Image data storage unit 71 Monitor 72 Monitor 91 Subject position correction unit 92 Examination information storage circuit 100 X-ray image diagnostic apparatus

Claims (4)

A top plate on which the subject is placed;
A top plate moving means for moving the top plate in the longitudinal direction and the width direction;
An X-ray generation unit that is attached to an arm and that irradiates the subject with X-rays and that is disposed opposite the X-ray generation unit and detects X-rays emitted from the X-ray generation unit Means,
Image data processing means for generating first and second image data from the X-ray projection data output by the X-ray detection means;
A light projecting means for irradiating light on the surface of the top plate to set a reference point on the top plate;
A subject position correcting means for correcting a difference between the reference point on the top and a predetermined portion of the subject;
The subject position correcting means adjusts a predetermined portion of the subject placed on the top plate at the time of X-ray irradiation for generating the first image data to coincide with the reference point. 1 subject position information,
Second object position information of the top plate that matches a predetermined portion of the subject placed on the top plate at the time of X-ray irradiation for generating the second image data with the reference point Calculate the difference,
The X-ray diagnostic imaging apparatus is characterized in that the difference is corrected by moving the top board by the top board moving means. A top plate on which the subject is placed;
A top plate moving means for moving the top plate in the longitudinal direction and the width direction;
An X-ray generation unit that is attached to an arm and that irradiates the subject with X-rays and that is disposed opposite the X-ray generation unit and detects X-rays emitted from the X-ray generation unit Means,
Image data processing means for generating first and second image data from the X-ray projection data output by the X-ray detection means;
A light projecting means for irradiating light on the surface of the top plate to set a reference point on the top plate;
X-ray moving means for horizontally moving the arm in the longitudinal direction and the width direction of the top plate;
Subject position correcting means for correcting a difference between the reference point on the top plate and a predetermined predetermined portion of the subject;
The subject position correcting unit is configured to cause the predetermined portion of the subject placed on the top plate to coincide with the reference point at the time of X-ray irradiation for generating the first image data. And first subject position information of the X-ray detection means;
A second of the X-ray generation means and the X-ray detection means for causing a predetermined portion of the subject placed on the top plate to coincide with the reference point at the time of X-ray irradiation for generating the second image data. The difference from the subject position information of
The X-ray diagnostic imaging apparatus is characterized in that the difference is corrected by moving the arm by the X-ray moving means. A top plate on which the subject is placed;
X-ray generation means for irradiating the subject with X-rays;
X-ray detection means for detecting X-rays emitted from the X-ray generation means;
Inspection information storage means for storing at least one first initial position information and second initial position information of the top plate, the X-ray generation means, and the X-ray detection means;
The information on the first initial position and the information on the second initial position are read from the inspection information storage means, and the difference between the information on the first initial position and the information on the second initial position is calculated. And an object position correcting means for correcting the at least one position. First image data is generated from the X-ray projection data at the first initial position output by the X-ray detection means, and second image data is generated from the X-ray projection data at the second initial position. Having image data processing means,
The inspection information storage means stores the information on the first initial position together with the first image data from the image data processing means, and the information on the second initial position together with the second image data. The X-ray image diagnostic apparatus according to claim 3, wherein:

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