JPS63132637A - X-ray irradiation field display apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (b) Industrial application field INDUSTRIAL APPLICATION This invention is utilized in the field of X-ray photography.

The present invention relates to an X-ray irradiation field display device, and more particularly, the present invention relates to an X-ray irradiation field display device that narrows down the X-ray irradiation field during X-ray photography, and uses a light source at the region to be examined to examine the degree of narrowing down the X-ray irradiation field. The present invention relates to a device for displaying.

(b) Prior Art An example of a conventional X-ray irradiation field display is shown in FIG. .

X! ! The collimator 22 is provided with light >FA 22 a, which is a simulated X-ray focus, and the irradiation field is known by the light irradiated onto the body surface of the subject 26 from the light M22 a. In addition, 20 is an X-ray tube, and 24' is an image receiving device or a film changer.

(c) Problems to be Solved by the Invention In an X-ray imaging apparatus for cardiovascular examination, as shown in FIG. There is a bottle stand on which 24 is positioned above the subject.

With such a bottle stand, the irradiation field cannot be seen even if it is irradiated with light using conventional methods. For this reason, it is necessary to perform X-ray fluoroscopy and check on a monitor in order to narrow down the results, which requires separate X-ray irradiation, which is time-consuming.

The purpose of the present invention is to display the irradiation field using light from the film side even in a tall Ang tube device in which the X-ray tube is placed at the bottom, and to display the irradiation field by the collimator. It is an object of the present invention to provide an X-ray field display device that is correctly matched.

(d) Means for solving the problem The above purpose is to provide two light source mounts so that the light emission line of the light source is initially parallel to the inner edge of the collimator aperture blade and directed toward the X-ray focal point. , a movable holder for moving the two light source fixtures closer or apart in parallel with the image receiving device, a light source displacement Φ position detection means, an aperture blade opening amount detection means, and a movable holder for moving the two light source fixtures closer or farther apart in parallel with the image receiving device; This can be achieved by having the aperture blades 41 (driving means) which calculates the opening amount and drives the aperture blades so that the projection line indicates the X-ray focal point and is held parallel to the inner edge of the aperture blades.

(e) Two imaginary lines are drawn parallel to the X-ray cone (which looks like a triangle on the side) connecting both sides of the image receiving device and the X-ray focal point, and the light source mount is placed on the upper imaginary line and the lower The movement of the light source and the amount of opening of the diaphragm are controlled so that the diaphragm blades move closer to each other in proportion to each other on the imaginary line. As a result, even if a 'Fi examiner is located between the image receptor and the X-ray tube, the irradiation field displayed to the examinee is reliable and matches the aperture opening amount.

()\)Example A preferred embodiment of the invention will be explained based on the drawings.

FIG. 1 is a plan view showing one embodiment.

FIG. 2 shows an enlarged example of the movable holding portion of the light source fixture according to the present invention. FIG. 3 is a diagram showing the relationship between the light projection line of the light source, the subject, the collimator leaf (aperture blade), and the X-ray focal point according to the present invention.

The light projection line 12a from the light source 12 for displaying the X-ray irradiation field has a function of displaying a straight line parallel to the inner i side 4a of the blade 4 of the X-ray diaphragm, as shown in FIG.

The light source fixture 14 has a light source 12, is slidably superimposed on the movable member 8, and is attached to be rotatable around a point O thereof, and is further provided with pins 9 at 40' spaced a certain distance apart. The pin 9 then moves along the guide groove 11 of the support plate.

If the slider 8 is moved left and right on the rail 10 by the wire drive 3, the distance between points 001 is constant, so if the grooves 11 are appropriately provided, the light source mount 8 will tilt with the left and right movement, and the light source 12 will always be able to receive X-rays. Indicate the direction of the focal point F.

FIG. 1 illustrates the movement of the light source fixture 8 and the associated driving of the opening of the aperture blades.

1 is a handle for moving the light source 12, 2 is a potentiometer that detects the movement of the light source 12, and 3 is a light J ffi
A wire for Ij, 4 is an aperture blade, 5 is a potentiometer for detecting the amount of movement of the aperture blade @4, 6 is a wire for driving the aperture blade, and 7 is a motor for driving the aperture blade.

The light sources 12.12 are located on the same plane as the image receiving surface 24a of the photographing device (for example, the film changer 24), are ff1lj by the wire 3, and are moved toward or away from each other within said plane.

In the illustrated embodiment, the light source 12.12 is removed by sweeping the handle 1.
When placed at a position corresponding to an appropriate size on the image receiving surface, the voltage detected from the potentiometer 2 and the aperture blade 4
The calculator 16 compares the voltage detected from the potentiometer 5 that detects the opening of the plate, and the latter matches the former. The aperture blade drive motor 7 is driven as follows.

At that time, the aperture blade drive motor 7 is operated so that the aperture blade front &la coincides with the X-ray cone created by the light source 12 and the focal point F.
is controlled.

In this way, the irradiation X-ray cone is determined by the light source 12.12 that directs the focal point F to the palm, and the position of the aperture blade @4 is controlled so that this X-ray cone is realized. When irradiating X-rays from below, the section displayed on the subject 26 by the line 12a projected from the image receiving plane 24a coincides with the section through which the X-rays actually pass. This is especially clear from FIG.

In addition, if a motor is attached in place of the handle 1 and the light source 12 is heated electrically, operation from a remote location is also possible.

FIG. 4 is an explanatory diagram illustrating another example of application of the present invention.

This application example shows that even if the workpiece cannot be seen due to an obstruction on the way, the position of the workpiece can be controlled while being monitored with light.

()) Effects According to the present invention, when irradiating X-rays from below the subject with an X-ray imaging device with a fixed X-ray focus-image receiving surface dark distance, the irradiation field can be visually recognized on the top of the subject. In addition, an accurate irradiation field can be displayed on the subject even if the distance between the image receiving surface and the subject changes.

Further, the position of an object that cannot be seen visually due to a closed structure or an obstacle can be controlled while being monitored with light, and the principle of the present invention can be widely utilized.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, FIG. 2 is a partially enlarged view thereof, FIG. 3 is a diagram illustrating the principle of the present invention, and FIG. 4 is a diagram illustrating another application example. 1 is a handle, 2 and 5 are potentiometers, 3 and 6 are wires, 4 is an aperture blade, 7 is an aperture blade drive motor, 8 is a slider, 9 is a rotation pin, 10 is a rail, 11 is a groove in the pin straw , 12 is a light source, 14 is a light source fixture, and 26 is a subject. Patent applicant Shimadzu Corporation Representative Patent attorney Ike 1) Sadao. Figure 2 Figure 1 Figure 3 Figure 6 Figure 5 Figure 4 Procedures Amendment (Method) % formula % l, Indication of the case Patent application 1981-281376 Name Shimadzu Corporation Representative Nishi Hachi Lee Katsumi 4, Agent Address: 532 Telephone: 06-305-4033
5-7-14-6 Nishinakajima, Yodoyo-ku, Osaka City, subject of correction
Column 7 for a brief explanation of the drawings in the clarification sii, Contents of correction. FIG. 5 is a diagram illustrating an X&11 irradiation field display according to a conventional example, and FIG. 6 is a diagram illustrating defects in that case. ” is added.

Claims (1)

[Claims] Two light source fixtures with the light source emitting line initially parallel to the inner edge of the collimator aperture blades and directed toward the X-ray focal point, and two light source fixtures parallel to the image receiver and moved closer together or apart. a moving holder for detecting the amount of movement of the light source, a means for detecting the amount of opening of the aperture blades, and a light emitting line that indicates the X-ray focal point according to the detected amount of movement of the light source and an inner edge of the aperture blade. 1. An X-ray irradiation field display device, comprising: an aperture blade drive means that calculates and drives the aperture blade opening amount so as to maintain the aperture blades parallel to each other.