JPH11347022A - X-ray fluoroscopy device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust positions of the projection system of an X-ray fluoroscopy device on the monitor screen normally and speedily so that the image can be easily examined by controlling the moving speed of the drive mechanism according to the size of the visual field set by an operator. SOLUTION: This X-ray fluoroscopy device has an X-ray tube 1 and an X-ray imaging part 2 which are held opposite to each other. A subject 4 on a bed 3 and the fluoroscoping position are relatively movable, and an image from the X-ray imaging part 2 is projected on a monitor screen 6. In addition, the X-ray fluoroscopy device has also a mechanism for adjusting the relative speed of moving of the bed 3 and the fluoroscoping position by the drive means. The mechanism adjusts the relative speed of moving of the bed 3 and the fluoroscoping position according to the size of the visual field set by a visual field size changing switch 7 when an operation handle 8 of the drive mechanism is operated interlocking with the change of the visual field of the X-ray imaging part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray fluoroscopic apparatus for performing fluoroscopic imaging of a subject mounted on a mounting table.
In particular, the present invention relates to an improvement in a driving method of a mounting table on which a subject is mounted.

[0002]

2. Description of the Related Art In a conventional X-ray fluoroscopic apparatus, X
The X-ray tube and the X-ray imaging unit, for example, an image amplifier are held so as to face each other, and the subject on the mounting table disposed therebetween can be moved and scanned in the body axis direction. For example, when a motor is driven by operating an operation handle to move a mounting table (subject) to a target position, the force of the operator sensed by a sensor of the operation handle or a speed setting device attached to the operation handle. In accordance with the setting, the voltage value to the motor is adjusted to change the rotation speed of the motor. In this case, the operator moves the mounting table, that is, the subject, to a target position while watching the fluoroscopic image projected on the monitor screen, and the visual field of the fluoroscopic image can be changed to a large or small size by operating the image amplifier. I have.

[0003]

However, in the conventional apparatus, the moving speed of the mounting table, ie, the subject, is determined only by the force of the operator or the setting of the speed setting device attached to the operation handle regardless of the size of the visual field. It is configured to be. Therefore, the moving speed of the drive mechanism viewed on the monitor screen differs between a case where the visual field is narrow, that is, the perspective image is enlarged, and a case where the visual field is wide, that is, the perspective image is reduced. Therefore, there is a problem that it is difficult for the operator to move a desired portion to a desired location on the monitor screen unless the operator adjusts the force applied to the operation handle or the setting of the speed setting device attached to the operation handle depending on the size of the field of view. Was.

An object of the present invention is to provide an X-ray fluoroscopic apparatus in which the size of the visual field and the moving speed of the driving mechanism of the mounting table are associated with each other in view of the above problems.

[0005]

In order to achieve the above object, in the X-ray fluoroscopic apparatus according to the present invention, a moving speed on a fluoroscopic screen and a force setting of an operator or a speed setting device attached to an operation handle are provided. The movement of the drive mechanism is controlled to the normal and easy-to-see speed of the operator according to the visual field size set by the operator, so that the video system can be positioned quickly on the monitor screen. Becomes possible.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. FIG. 1 is an overall front view showing an outline of an X-ray fluoroscopic apparatus of the present invention in an imaging use state.
X-ray tube for irradiating X-rays, 2 for an X-ray imaging unit for imaging a fluoroscopic image of X-rays, 3 for a mounting table for mounting a subject, 4 for a subject, 5
Is a camera that captures an X-ray fluoroscopic image, 6 is a monitor that displays an X-ray fluoroscopic image, 7 is a visual field size switch that switches the visual field size of an image, 8 is an operation handle that operates a drive mechanism, and an X-ray tube 1. The X-ray imaging unit 2 is held opposite to the subject 4 with the X-ray imaging unit 2 capturing a fluoroscopic image of the subject 4, the captured image is captured by the camera 5, and displayed on the monitor 6. ing. When the driving mechanism is operated with the operation handle 8 according to the setting of the visual field size changeover switch 7, the moving speed of the mounting table 3, that is, the subject 4 is controlled to a speed at which the image is normal and easy for the operator to observe. It is configured as follows.

FIG. 2 shows a basic structure of a driving mechanism in the X-ray fluoroscopic apparatus of the present invention. Reference numeral 8 denotes an operation handle in FIG. 1, and 9 denotes a speed of a driving means, for example, a circuit for changing the rotation speed of a motor. The set output voltage 10 is also an amplifier circuit of a circuit for changing the rotation speed, and 11 is a motor driver for controlling the drive means. The speed set output voltage 9 of the operating handle 8 of the drive mechanism is amplified by the amplifier circuit 10. Output to the motor driver 11 as a speed command. Reference numeral 7 denotes a field size switch in FIG.
Is changed by the visual field size changeover switch 7, the relationship between the force applied (pressure) applied to the operation handle 8 and the rotation speed of the motor can be changed. That is, the amplification factor of the amplifier circuit 10 is adjusted in conjunction with the change of the visual field size changeover switch 7 so that the image is normally and easily observed when viewed on the monitor 6.

FIG. 3 shows the relationship between the operation (pressure) or the set speed of the steering wheel and the speed setting output voltage 9. The speed setting output voltage 9 of the operating handle 8 of the drive mechanism shown in FIG. Proportional to handle operation or set speed.

FIG. 4 shows an outline of an amplifier circuit 10 for a steering speed setting output voltage 9. Reference numeral 12 denotes a fluoroscopic ON / OFF switch for starting X-ray fluoroscopy. ON / OFF switch 12
Thus, the amplification factor can be switched by the switch. Reference numeral 13 denotes a resistor that changes the amplification factor of the amplifier circuit 10. If the resistance values of R1 to R3 of the resistor 13 are appropriately set, the moving speed of the drive mechanism on the see-through screen and the force applied to the operation handle 8 are proportional. It is possible to do. Furthermore, see-through ON /
By switching between enabling and disabling this function with the OFF switch 12, it is possible to prevent a change in speed due to the size of the field of view when moving while viewing the apparatus.

[0010]

Since the X-ray fluoroscopic apparatus of the present invention is configured as described above, the operator can quickly position the drive mechanism on the monitor screen, and the subject can be inspected. Can be improved, and the burden on the subject can be reduced due to the decrease in the amount of exposure.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an embodiment of the present invention in use.

FIG. 2 is a diagram showing a basic configuration of a drive mechanism in the embodiment device of the present invention.

FIG. 3 is a diagram showing a relationship between an operation or set speed of a steering wheel and a speed set output voltage in the device according to the embodiment of the present invention.

FIG. 4 is a diagram showing an outline of an amplifier circuit in the device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... X-ray tube 2 ... X-ray imaging part 3 ... Placement table 4 ... Subject 5 ... Camera 6 ... Monitor 7 ... Field-of-view size changeover switch 8 ... Operation handle 9 ... Speed setting output voltage 10 ... Amplification circuit 11 ... Motor driver 12 ... Transparent ON / OFF switch 13 ... Resistance

Continued on the front page (72) Inventor Hirotaka Isono 1 Nishinokyo Kuwaharacho, Nakagyo-ku, Kyoto Inside Shimadzu Corporation Sanjo Plant

Claims (1)

[Claims] An X-ray tube and an X-ray imaging unit are held opposite to each other, and a subject and an X-ray fluoroscopic position on a mounting table can be relatively moved by driving means. In an X-ray fluoroscopic apparatus configured to project an image of a subject on a monitor screen, when an operation handle of a drive mechanism is operated in conjunction with a change in an imaging field of view of the X-ray imaging unit, the operation is performed in accordance with the setting of a field size switch. The mounting table by the driving means and X
An X-ray fluoroscopic apparatus, comprising a mechanism for adjusting a relative moving speed with respect to a fluoroscopic position.