JPH08196535A - Catheter and x-ray diagnostic image system - Google Patents

Abstract

PURPOSE: To easily trace the tip part of a catheter inserted to an examinee by providing an oscillator means which generates an electromagnetic wave at an insertion terminal in the catheter equipped with the insertion terminal to be inserted to the examinee and an operating part which operates the position of the insertion terminal. CONSTITUTION: An oscillation antenna 19 as a wave oscillation source is embedded near the tip of the catheter 16, and an oscillator 20 is provided near the base of the catheter 16, and they are connected with each other with a lead wire 21. A circular loop shape reception antenna 23a of size nearly equal to the diameter of an image intensifier 14 for side face is provided on the input face of the image intensifier along the edge of the image intensifier 14 for side face located at the other terminal of a Q arm 12 for side face. When a doctor moves the catheter 16 and the oscillation antenna 19 of the catheter 16 is operated, the Q arm 12 for side face, i.e., the reception antenna 23a is moved following the motion of the oscillation antenna 19. In this way, an appropriate visual field is secured without performing the complicated position control operation of an image intensifier.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter (internal insertion device) and an X-ray image diagnostic system, for example, a distal end portion of a moving catheter in an angiography of a subject is placed within the visual field of the image intensifier. The present invention relates to a technique effective for an X-ray image diagnostic system capable of automatically tracking the distal end portion of the catheter in the radiography performed while performing.

[0002]

2. Description of the Related Art A circulatory system X-ray diagnostic apparatus is used for precisely examining the morphology of the heart and blood vessels and their blood flow states. A contrast agent is injected into the blood vessel and the movement of the contrast agent is photographed. By doing so, the diagnosis is made. The diagnosis target is
It is located in all areas from the heart to the head and abdomen, and blood vessels in the lower extremities.

Particularly, in circulatory organ diagnosis, compared with other X-ray diagnoses, techniques for short-time X-ray exposure and high-speed continuous photography are required in order to trace and image the fast flow of a contrast medium. Therefore, the circulatory organ X-ray diagnostic apparatus is required to have higher accuracy than general X-ray diagnostic equipment, and at the same time, there are a wide variety of dedicated units and peripheral equipment.

The basic performance required for a circulatory system X-ray diagnostic apparatus is as follows: (1) In order to perform imaging in synchronism with the injection of a contrast agent, especially the automatic check function of the preparation state before imaging and the automatic operation at the time of imaging Having an exposure control function, (2)
The diagnostic performance of the device must be ensured so that the injection amount of the contrast agent can be as small as possible. (3) By moving the X-ray source and the image receiving system without moving the subject as much as possible,
Fluoroscopic imaging from three-dimensional multi-directions can be performed easily and quickly. (4) A function to reduce X-ray mutual fog in each image receiving system during simultaneous bi-directional imaging, ( 5) Immediate response to emergencies can be mentioned.

There are various methods for angiography, and there are various places such as a femoral artery, an elbow vein, a brachial artery, and an axillary vein where a catheter (internal insertion device) for injecting a contrast medium is inserted into a blood vessel. Use points. In the case of coronary angiography, there are procedures such as the Sones method inserted from the brachial artery and the Judkins method inserted from the femoral artery. After catheter insertion, fluoroscopy is performed up to the coronary artery. While advancing the catheter, a contrast agent is injected at the place where it reaches the entrance of the coronary artery to perform coronary angiography.

In recent years, not only examinations and diagnoses but also treatments using catheters have come to be performed, and they are becoming more widespread due to advantages such as reduction of surgical invasion and cost saving. However, treatment with a catheter requires careful work on a fine portion, and a treatment field obtained from an image intensifier (hereinafter also referred to as II) which becomes a narrow field (for example, a circular field having a diameter of 14 to 19 cm) is obtained. It is necessary to secure it properly.

The circulatory organ X-ray diagnostic apparatus (circulatory system diagnostic system) is described in "Recent Medical Image Diagnostic Equipment" issued by Asakura Shoten, June 25, 1988, P56 to P58. This document discloses an outline of a cardiovascular examination system (biplane cine).

[0008]

In the conventional X-ray image diagnostic apparatus, when a catheter inserted into a blood vessel is advanced to the target blood vessel while performing fluoroscopy, it is different from the doctor who operates the catheter. The technician was moving II in order to maintain an appropriate field of view while looking at the image from II, which made position control operation difficult. The longer the distance from the catheter insertion site to the target blood vessel, the more difficult the position control operation will be.

In addition to the inspection and diagnosis, in the treatment by the catheter, careful work is performed on a fine portion, so it is necessary to properly secure the treatment visual field obtained from the narrow visual field II. It was necessary to perform control operations.

An object of the present invention is to provide a catheter in which the tip portion of the catheter inserted into the subject can be easily tracked.

Another object of the present invention is to provide an X-ray image diagnostic system for performing X-ray photography while tracking the tip portion of a catheter inserted into a subject, and place the tip portion of the catheter within the visual field of the image intensifier. An object of the present invention is to provide an X-ray image diagnostic system that can easily secure a proper visual field by always positioning it.

[0012]

The outline of the representative ones of the inventions disclosed in the present application will be briefly described as follows. That is, the X-ray image diagnostic system of the present invention includes a table on which a subject is placed, an X-ray tube device that is arranged around the subject on the table and emits X-rays to the subject, An image intensifier that is arranged to face the X-ray tube device and converts an X-ray image transmitted through the subject into a visible light image, a support that supports the X-ray tube device and the image intensifier, and the image intensifier. A television camera that captures a visible light image converted by a fire and converts it into an electric signal, and an image display device that displays an image by the TV camera are provided.
X using a catheter inserted into the body of the subject
A line image diagnostic system, wherein a radio wave transmitting means for transmitting a radio wave provided at the distal end portion of the catheter, and a detecting means for receiving the radio wave transmitted from the radio wave transmitting means,
And a control system for driving and controlling the support so that the position of the radio wave transmitting means is positioned within the visual field of the image intensifier by processing the information by the detecting means.

Further, the catheter of the present invention is a catheter having an insertion end to be inserted into a subject and an operation section for operating the position of the insertion end, wherein the insertion end is provided with a transmitting means for generating an electromagnetic wave. ing.

[0014]

According to the above-mentioned means, in the X-ray image diagnostic system of the present invention, when the catheter is inserted into the subject, radio waves are emitted from the transmitting antenna provided at the insertion end portion of the catheter, and The catheter is inserted while receiving the radio waves with the loop-shaped receiving antenna attached to the side image intensifier. The detected radio wave becomes strongest when the radio wave transmission source (transmission antenna) is located at the center of the loop-shaped receiving antenna. Therefore, in the control system, the side Ω arm that supports the side image intensifier is moved so that the position of the radio wave source is always located in the center of the visual field of the side image intensifier. As a result, the tip of the catheter operated by the doctor who operates the catheter is always located in the center of the visual field of the lateral image intensifier in the body axis direction of the subject. ) Can be moved without losing sight of the tip of the catheter.

This eliminates the need for a technician different from the doctor who operates the catheter to perform a difficult position control operation of moving the image intensifier while observing the image from the image intensifier. Can be performed with an optimum work field of view.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view showing the concept of tracking control of a main part of a side imaging system of an X-ray image diagnostic system according to a first embodiment of the present invention, and FIG. 2 is an X view to which the present invention is applied. 4 is a front view showing a main part of the radiographic image diagnosis system, FIG. 3 is a perspective view showing a catheter according to an embodiment of the present invention, and FIG.
Is also a schematic diagram showing a control system for controlling the movement of the side Ω arm, FIG. 5 is an explanatory diagram of the directivity of the loop-shaped receiving antenna, and FIG. 6 is a state in which the side II is also tracking the radio wave source. Similarly, FIG. 7 is an explanatory view showing a control concept of the table top with respect to the front imaging system. Also,
FIG. 11 is an explanatory view showing the visual field center position control and the arbitrary position control in the side II.

The X-ray image diagnostic system to which the present invention is applied includes a cardiovascular system for diagnosing X-rays from two directions, the front and the side, and has an overall structure as shown in FIG. Has become. In this embodiment, a cardiovascular examination system will be described in which a catheter is inserted into a subject to image and inspect the coronary arteries of the heart.

The table 3 on which the subject 1 is placed is supported by a base 40 placed on the floor so as to be able to move up and down via an elevating shaft 41. A top plate 2 is provided on the table 3, and the subject 1 lies on the top plate 2. Therefore, the subject 1 can move in the longitudinal direction of the top plate 2, and the top plate 2 can move up and down.

A front C-arm supporting device 4 is installed on the floor on the extension line of the moving direction of the top plate 2. On the side surface of the front C arm support device 4 on the side of the top plate 2,
A front arm 5 extending obliquely upward is attached so as to be rotationally controllable as shown by an arrow A. A curved front C-arm 6 is attached to the front end of the front C-arm support device 4 along the curved surface so as to be rotationally controllable as shown by an arrow B.

A front X-ray tube device 7 that radiates X-rays to the subject 1 is fixed to the lower end of the front C-arm 6, and a front X-ray tube device 7 is attached to the upper end via a guide body 42. An image intensifier (front II) 8 is attached. The front II 8 detects X-rays emitted from the front X-ray tube device 7 and transmitted through the subject 1, and converts the front X-ray image into a visible light image. Further, a front TV camera (TV camera) 31b for converting the visible light image into an electric signal is attached to the front II8. Further, the front II 8 can move toward and away from the subject 1 as shown by an arrow C.

Further, the upper portion of the front C-arm support device 4 can be rotationally controlled as indicated by an arrow H, and the front X-ray tube device 7 and front II 8 can be moved from the position of the top plate 2 or the subject 1 at the time of retreat. And so on.

On the other hand, a support 45 is fixed to the ceiling, and a circular support 47 is fixed to the support 45 via a plurality of columns 46. This support 47 is
The monitor television group arranged in multiple stages is supported via the arm 48. A rotation control mechanism is built in the support body 47. The rotation control mechanism controls the rotation of the monitor television group so that a doctor or a technician can always watch the monitor television group.

The monitor television group includes, for example, a side monitor television 15a, a front monitor television 15b, an electrocardiographic waveform monitor television 15c, and a position display monitor television 15d.
Etc. The image captured by the front TV camera 31b is displayed on the screen of the front monitor TV 15b. An image captured by a side-view television camera (TV camera) 31a, which will be described later, is the side-view monitor television 1
It is displayed on the screen of 5a.

Further, a rail 50 having a frame structure is fixed to the ceiling, and the rail 50 has a side surface Ω.
An arm support device (Ω arm) 10 is attached so as to be capable of reciprocating along the moving direction of the top plate 2 as shown by an arrow G. At the center of the lower surface of the side surface Ω arm support device 10, a side surface arm 11 is attached so as to be capable of rotation control as indicated by an arrow D.

A curved side surface Ω arm 12 is attached to the side surface arm 11. Ω arm for side 1
2 is slidable along the curved surface as indicated by arrow E.

A side-face X-ray tube device 13 for radiating X-rays from the side face of the subject 1 is fixed to one end of the side-face Ω arm 12, and the other end is provided with the side-face X-ray tube device 13.
An image intensifier for the side surface (I. For the side surface) that receives X-rays emitted from the X-ray tube device 13 and transmitted through the subject 1.
I.14) is fixed. The side II 14 converts a side X-ray image into a visible light image. Also, for the side II
Although not shown in FIG. 2, a side surface television camera 31a for converting the visible light image into an electric signal is attached to the back surface of 14. The image taken by the side surface television camera 31a is displayed on the side surface monitor television 15a.

In the X-ray image diagnostic system of the first embodiment,
It is possible to shoot from two directions, the front and side, and at that time, various shooting angles can be realized. By rotating the front arm 5 in the A direction, the front imaging system can be rotated around the body axis of the subject 1, and by moving the front C arm 6 in the B direction, the front imaging system can be rotated in the body axis direction. By moving the front II 8 in the C direction, it is possible to change the physique of the subject 1 and change the enlargement ratio.

By rotating the side arm 11 in the D direction, the side photographing system can be rotated in the body axis direction, and by moving the side Ω arm 12 in the E direction, it can be rotated around the body axis. By moving the side II 14 in the F direction, it is possible to change the physique of the subject 1 and change the enlargement ratio.

Further, the side surface Ω arm supporting device 10 is G
By moving in the direction, the lateral imaging system can be horizontally moved in the body axis direction, and the lateral imaging system can be retracted from the periphery of the subject.

The horizontal position movement in the body axis direction with respect to the front imaging system can be performed by sliding the top plate 2 of the table 3 on which the subject 1 is placed, as shown in FIG. The vertical position movement in the vertical direction of the body axis can be performed by moving the table 3 up and down.

Further, a cine camera 51a is arranged on the other end side of the side surface Ω arm 12, and the side surface television camera 3 is provided.
The same image (image) taken by 1a (not shown because it is behind the side II 14 in FIG. 2) is also taken on the film. Similarly, the front C-arm 6 is also provided with a cine camera 51b and a front TV camera 31b. Further, a plurality of foot switches 52 are arranged on the floor. These foot switches 52 are designed to be stepped on by a foot so that various X-ray control operations can be turned on / off. Turned on by a doctor who operates some of the foot switches 52 with a catheter.
When turned off, for example, perspective imaging of the front imaging system or the side imaging system can be performed.

Also, attached to the rail 50 shown in FIG. 2 at various places are cables 53 for power supply and signals. Further, although not shown, each unit including a control system is connected by a predetermined cable, and each unit is configured to operate independently or in synchronization.

On the other hand, this is one of the features of the present invention. As shown in FIG. 3, a catheter (internal insertion device) 16 with a radio wave source is used, and in the first embodiment, as shown in FIG. As shown, the receiving antenna 23a as a receiving means for receiving the radio wave from the radio wave source is for the side surface.
The reception antenna 23b is attached to the II14, and the front II8 is also attached.

There are various catheters used for angiography and the like, depending on the application. The NIH side hole catheter has a closed tip and six holes on the side wall, and the Sones coronary angiography catheter has a straight hole and a side hole with a particularly fine 4 cm tip. First
In the examples, the case where the present invention is applied to a Cournand catheter which is the most basic type of catheter will be described. As shown in the schematic view of FIG. 3, the catheter 16 is a wire-shaped catheter that is inserted into the subject 1, and is a so-called straight-hole type catheter having a hole only at the insertion end (tip). The straight hole 17, which is an opening, is connected to the inner cavity 18.

In the first embodiment, as shown in FIG. 3, a transmission antenna (antenna) 19 as a radio wave transmission source is embedded near the tip of the catheter 16, an oscillator 20 is provided near the catheter 16 and a lead is provided between them. It has a structure connected by a wire 21. The outer diameter of the catheter 16 is several mm
Therefore, the transmitting antenna 19 can be sufficiently embedded. In this example, the transmitting antenna 19 and the lead wire 21 pass through the inside of the catheter 16 in order to utilize the smoothness of the outer wall of the catheter, but they can be provided on the outer wall of the catheter as long as they can be installed without any trouble.

As a result, the radio wave emitted from the oscillator 20 can be sent to the transmission antenna 19 by the lead wire 21 and radiated as the radio wave 22 from the transmission antenna 19 (see FIG. 3).

In the first embodiment, the fact that II is normally cylindrical is utilized, and the input surface of the side II 14 has a circular loop shape having a size similar to its diameter (for example, about 20 cm). Reception antenna (circular loop antenna) 23
a is provided. As shown in FIGS. 1 and 4, the receiving antenna 23a is provided along the edge of the side surface II 14 provided at the other end of the side surface Ω arm 12.

FIG. 4 shows a circular loop-shaped receiving antenna 23a.
It is a schematic diagram showing a support control system of II14 for the side provided with. The control system includes an amplifier circuit 24 that amplifies a signal (information) received by the reception antenna 23a, and a supporter drive circuit 25 that controls the movement of the side surface Ω arm support device 10.
It has an arithmetic circuit 26 for issuing a command to the supporter drive circuit 25 in order to move the side surface Ω arm support device 10 to a target position by a signal from the amplifier circuit 24.

The loop-shaped receiving antenna 23a has directivity as shown in FIG. When the height h from the transmitting antenna 19 which is a radio wave transmitting source to the loop-shaped receiving antenna 23a is constant, the receiving antenna 23a passes through the center of the loop formed by the antenna wire and is perpendicular to the loop A-
It is known that the voltage is most strongly induced when the source is on the A line, and the induced voltage is reduced when it is on the B-B line or the C-C line that does not pass through the center of the loop. By utilizing this phenomenon, the position of the loop-shaped receiving antenna 23a is moved in parallel so that the induced voltage becomes large, so that the radio wave transmission source (transmission antenna 19) can be positioned on the center line of the loop. That is, the doctor uses the catheter 1
6 is moved and the distal end portion (transmitting antenna 19) of the catheter 16 moves, as shown in FIGS. 1 and 6, the side surface Ω arm 12 (in other words, the receiving antenna 23).
a) moves following the movement of the transmitting antenna 19. The movement of the receiving antenna 23a is also the movement of the side II 14, and it is ensured that the tip portion (the transmitting antenna 19 portion) of the catheter 16 is always positioned at the center of the side II 14. The catheter 16 is inserted, for example, from the thigh of the subject 1 and fed to the entrance of the coronary artery of the heart. In the case of the first embodiment, as shown in FIG. 11A, the radio wave source 19 is located at the center of the side II field of view 60. A target organ 61, for example, a heart is projected in the side II field of view 60, and a radio wave source (at the tip of the catheter 16 is introduced at the entrance of a blood vessel 62 (for example, a coronary artery) extending along the target organ 61). A transmitting antenna) 19 is located.

As a result, the doctor looks at the side monitor TV 15a by the side II 14 and sees the catheter 16
Will be able to concentrate on the operation.

On the other hand, with respect to the front imaging system, as shown in FIG. 7, its position can be moved only by rotation as the tracking of the transmitting antenna 19 as shown by an arrow B. Receiving antenna 2 near the plane
The top plate 2 of the table 3 is controlled to slide by 3b, and the transmitting antenna 19 is set to the circular loop antenna 2
Make it visible on the central axis of 3b. When the catheter 16 provided with the transmitting antenna 19 is moved using this control mechanism, first, the movement of the catheter 16 is temporarily stopped, and the transmitting antenna 19 is seen on the central axis of the loop antenna 23b. The top plate 2 is slid and moved, and then the catheter 16 is moved, so that the top plate 2 is slid so as to track the transmitting antenna 19.

The moving catheter 1 is controlled by controlling the side-view imaging system and the front-view imaging system.
The tip portion of 6 can be traced, and the vicinity of the catheter tip can be always brought to the center of the visual field of the side II 14 and the front II 8. Furthermore, II8 for the front and I. for the side.
By providing a circular loop antenna of the same size as II on the input surface of I.14, the receiving antenna 23a
It has directivity and can be simplified and downsized by integrating with II.

Here, in the first embodiment, an example in which the front photographing system and the side photographing system are provided is shown, but the slide control of the table 3 is performed for automatic follow-up control of the front photographing system. As a result, the side imaging system does not have to move after performing the position control only once. Therefore,
If only the position control of the side image capturing system is performed by an engineer, only the automatic follow-up control of the front image capturing system is performed, and the facility cost can be reduced.

In addition, even when only the front photographing system is provided,
X-ray photography from the side is possible by rotating the front arm 5 in the direction of arrow A, and even when only the side imaging system is provided, the X-ray photography from the front is performed by moving the side Ω arm 12 in the direction of arrow E. Therefore, even when each is provided with only a single shooting system, it is possible to apply the front-side shooting system control and the side-side shooting system control to automatically follow.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example,
In the above embodiment, the receiving antenna 23a has a loop shape, but a solenoid winding can be used as well.

8 to 10 are schematic views showing a part of the X-ray image diagnostic system according to the second embodiment of the present invention. FIG.
Is a linear antenna along the circumference of the side II14.
It is a schematic diagram of a supporter position control mechanism showing an example provided here.
II1 for the side attached to the Ω arm 12 for the side
4 near the input surface of the linear antennas 27a, 27b, 2
7c is provided at an angular interval of 120 degrees. Three linear antennas 27a, 27b, 27c
Are connected to the comparison calculator 28 in the control system.
In the comparison calculator 28, each linear antenna 27a, 2
The signals (information) detected by 7b and 27c
In the configuration described above, the supporting device drive circuit 25 for driving the side surface Ω arm supporting device 10 and the side surface Ω arm 12 is operated.

Radio waves from the radio wave transmission source are received by the respective linear antennas 27a, 27b, 27c, but the strength of the received radio wave changes depending on the distance from the radio wave transmission source to the transmission antenna. Three linear antennas 27
The supporter drive circuit 25 is operated so that the reception strengths at a, 27b, and 27c are the same. Then, the radio wave source will always be located at the center of II, and even if the radio wave source moves with the movement of the catheter, I.
I. It can be tracked so that it does not deviate from the center of the visual field.

Further, indicators 30a, 30b, 30c for instructing which position in the II field of view the position of the radio wave transmission source is connected to the comparison calculator 28. The indicator 30a indicates the degree of comparison when performing the comparison calculation between the linear antenna 27a and the linear antenna 27b. For example, the ratio of the amplification degree to the received radio wave at each antenna, etc. Can be instructed. Similarly, the indicator 30b can instruct the degree of the linear antenna 27b and the linear antenna 27c, and the indicator 30c can instruct the degree of the linear antenna 27c and the linear antenna 27a.

Then, the indicators 30a, 30b, 30
By the instruction of c, the comparison calculator 28 can amplify the received radio wave, compare and calculate the three signals, and set the position of the radio wave transmission source to the specific position of the II visual field. That is,
As shown in FIG. 9, three linear antennas 27a, 27b arranged at 120 ° intervals around the side II14,
Lines connecting 27c are the indicator adjustment lines 37, 38, 3
Set to 9.

On the indicator adjusting lines 37, 38, 39, there are indicator adjusting points 57, 58, 59 indicated by the indicators 30a, 30b, 30c, respectively. The indicator adjustment point 57 has the ratio of the amplification degree of the signal from the linear antenna 27a and the amplification degree of the signal from the linear antenna 27b as a line segment, and the indicator adjustment line 37.
Similarly, the indicator adjustment point 58 is a point where the indicator adjustment line 38 is divided according to the amplification ratio of the linear antenna 27b and the linear antenna 27c, and the indicator adjustment point 59 is a straight line. Antenna 27c and linear antenna 27a
The point is that the indicator adjustment line 39 is divided according to the ratio of the amplification degree in.

The intersection of the perpendicular to the indicator adjustment line at at least two indicator adjustment points of the indicator adjustment points 57, 58, 59 can be the radio wave source tracking position 65.

For example, the indicators 30a, 30b, 3
If the setting instructions for 0c are the same, the indicator adjustment point 5
7, 58, 59 are indicator adjusting lines 37, 38,
It becomes a point that internally divides 39 in a one-to-one manner, and if a line perpendicular to the adjustment line is drawn through the adjustment point, it will intersect at the II center, so that the radio wave source can be moved and tracked at the II center.

The position of the radio wave source tracking position 65 is stored in the control system so that the transmitting antenna 19 is always aligned with the radio wave source tracking position 65 in the side II field of view 60. You can The radio wave source tracking position 65 can also be set at a desired position by hitting a key of an input keyboard of a control system (not shown).

Therefore, as shown in FIG. 11B, the radio wave source tracking position 65 is set to the side II field of view 60.
The target organ 61 (for example, the heart) is entirely displaced from the center of the side view II for the side view 60.
It can be projected inside.

In the second embodiment, the linear antenna 27a,
Set the positions 27b and 27c around the side II14 1
Although the intervals are 20 degrees, other angular intervals may be used.

Although the number of linear antennas for reception is three in the second embodiment, it may be more.

Although the receiving antenna is shown as an omnidirectional straight line, it may have a directional shape.

Further, the indicators 30a, 30b, 30
If a joystick-like batch input configuration is used instead of giving each instruction in c, position setting becomes easier.

In the case of the X-ray image diagnostic system of the first embodiment, the position of the transmitting antenna 19 is controlled by the radio wave intensity, whereas in the case of the second embodiment, the absolute amount of the radio wave intensity is not used. Since the control is performed by the output difference of the plurality of antennas, it is possible to flexibly cope with the change of the radio wave intensity due to the movement between the bone part 66 and the soft part 67 as shown in FIG. The source tracking position 65 can be tracked.

In the case of the first and second embodiments, the transmitting antenna 1 provided at the tip portion of the catheter 16
Reference numeral 9 is linear and has no directivity, but may have directivity. For example, the catheter 16
Since the cross section is cylindrical, if a saddle type antenna structure having a curved cross section along this cylinder is used,
Radio waves are strongly radiated toward the center of the curved surface and become directional. Therefore, when the transmitting antenna has a directional structure, the transmitting antenna 19 can be traced around the body axis of the subject 1.

In the first and second embodiments, the receiving antenna is set in the vicinity of the side II 14, but radio waves can be detected stably and the transmitting antenna 1
Any other place may be used as long as the position of 9 can be accurately detected.

FIG. 12 shows an X-ray image diagnostic system according to a third embodiment of the present invention, in which a receiving antenna 35a for receiving and tracking, a receiving antenna 35b, and a receiving antenna 35c are arranged at three corners of an examination room 32. One corner is the position origin (Xo, Y
o) 36. The position origin (Xo, Y
o) 36 and receiving antenna (Xo, Ya) 35a, receiving antenna (Xb, Ya) 35b, receiving antenna (X
b, Yo) 35c is located at each vertex of the rectangular body and forms a coordinate system. The table 3 is located in the center of the examination room 32. In FIG. 12, many of the fixed articles such as a table are omitted. The receiving antennas 35a, 35b, 35c detect the position of the transmitting antenna 19 at the tip of the catheter inserted into the subject. Then, the side II 14 is moved by tracking the transmitting antenna (Xant, Yant) 19 by the control system, and the image by the side II 14 is displayed on the side monitor TV.

Here, the position of the center of II (Xi, Yi)
The position of the II field of view in the coordinate system is always calculated, and is used to prevent interference between the table and II. This information and the position of the transmitting antenna 19 (Xant, Yan
The movement of the side II 14 is controlled from t). The reception antennas 35a, 35b, and 35c have strengths of received radio waves depending on the distance from the transmission antenna 19. It is possible to determine where in the inspection room 32 the transmitting antenna 19 exists from the difference in strength, and the side surface II 14 is moved to that position. At this time, the center position of the side II14 and
The position of the II field of view can be determined in consideration of the II field of view range, and the in-field position is determined by the indicators 30a, 30b, 30c as shown in the second embodiment.

In the third embodiment, the side photographing system is shown, but in the case of the front photographing system, the table 3 is the one to be moved although the same position detecting method is used.

Further, it is needless to say that the present invention can be applied to the case of the side photographing system alone, the case of the front photographing system alone, and the case of having both photographing systems.

Although the receiving antenna is arranged at each vertex of the rectangular body, it may be arranged at another position. And
Although the position origin is set to a position different from that of the receiving antenna, one of the receiving antennas may be arranged at the same position. And
The number of receiving antennas may be two only when the receiving antennas can be installed at both corners of one side of the examination room 32.

In the above description, the case where the invention made by the present inventor is mainly applied to the cardiovascular system for diagnosis having a biplane structure, which is the field of application of the background, has been described, but the invention is not limited thereto. Instead, it can be similarly used for a cardiovascular diagnostic system having a single plane structure, for example. The present invention can be applied to at least an X-ray image diagnostic system using a catheter.

[0068]

According to the present invention, since a transmitting antenna (radio wave transmission source) is attached to the distal end portion of the catheter inserted into the blood vessel of the subject to emit a radio wave, the radio wave is transmitted by the receiving antenna. Since the source can be traced and always visible at a predetermined position in the image intensifier's field of view, a proper field of view can be secured without difficult image intensifier position control operations.

Since the catheter of the present invention has a structure having a radio wave source at its tip, for example, if a plurality of receiving antennas are arranged in the examination room, the tip of the catheter that has entered the body of the subject is detected. Can always be detected in the coordinate system. Therefore, by automatically controlling the position of the side shooting system, the radio wave source can always be positioned (secured) within the field of view of the side shooting system image intensifier, and the position of the front shooting system is automatically controlled. By doing so, the radio wave transmission source can always be positioned (secured) within the field of view of the front-side imaging system image intensifier.

Therefore, by using the X-ray image diagnostic system of the present invention, it is difficult for a technician different from the doctor who operates the catheter to move the image intensifier while observing the image from the image intensifier. This eliminates the need for operation and enables the doctor to perform precise operation with an optimal work field of view.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the concept of tracking control of a main part of a side imaging system of an X-ray image diagnostic system according to a first embodiment which is an embodiment of the present invention.

FIG. 2 is a front view showing a main part of an X-ray image diagnostic system to which the present invention is applied.

FIG. 3 is a perspective view showing a catheter according to an embodiment of the present invention.

FIG. 4 is a schematic diagram showing a control system for controlling the movement of the side surface Ω arm in the first embodiment.

FIG. 5 is an explanatory diagram of directivity of the loop-shaped receiving antenna in the first embodiment.

FIG. 6 is an explanatory diagram showing a state in which the side II is tracking the radio wave source in the first embodiment.

FIG. 7 is an explanatory diagram showing a concept of control of a table top with respect to the front imaging system in the first embodiment.

FIG. 8 is a schematic diagram showing a part of an X-ray image diagnostic system according to a second embodiment of the present invention.

FIG. 9 is an explanatory diagram of arbitrary position control in the visual field of the side II according to the second embodiment.

FIG. 10 is an explanatory diagram illustrating strength-independence of radio waves in the second embodiment.

FIG. 11 is an explanatory diagram showing a visual field center position control and an arbitrary position control in the side surface II.

FIG. 12 is a schematic plan view showing an entire examination room equipped with an X-ray image diagnostic system according to a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Subject, 2 ... Top plate, 3 ... Table, 4 ... Front C arm support device, 5 ... Front arm, 6 ... Front C arm, 7
… Front X-ray tube device, 8… Front II, 10… Side Ω
Arm support device, 11 ... Side arm, 12 ... Side Ω arm, 13 ... Side X-ray tube device, 14 ... Side II, 16
… Catheter, 19… Transmission antenna, 20… Oscillator, 2
2 ... radio wave, 23a ... receiving antenna, 24 ... amplifier circuit, 2
5 ... Supporter drive circuit, 26 ... Arithmetic circuit, 27a, 27
b, 27c ... Linear antenna, 28 ... Comparison calculator, 32
... inspection room, 35a, 35b, 35c ... reception antenna, 3
6 ... Position origin, 57, 58, 59 ... Indicator adjustment point.

Claims (2)

[Claims] 1. A catheter comprising an insertion end to be inserted into a subject and an operating section for operating the position of the insertion end, wherein the insertion end is provided with a transmitting means for generating an electromagnetic wave. 2. A table on which a subject is placed, an X-ray tube device that is arranged around the subject on the table and radiates X-rays to the subject, and is arranged to face the X-ray tube device. An image intensifier for converting an X-ray image transmitted through the subject into a visible light image, a support for supporting the X-ray tube device and the image intensifier, and visible light converted by the image intensifier. An X-ray image diagnostic system having a television camera that captures an image and converts the image into an electric signal, and an image display device that displays the image by the television camera, and uses a catheter inserted into the body of the subject, Radio wave transmitting means provided at the distal end portion of the catheter, detecting means for receiving the radio wave transmitted from the radio wave transmitting means, and information processed by the detecting means And a control system for driving and controlling the support so that the position of the radio wave transmitting means is located within the visual field of the image intensifier.