JPH04128710U - Distance detection device between X-ray focal point and image receiving surface in X-ray automatic diaphragm device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a device that detects the distance between an X-ray focus and an image receiving surface in an automatic X-ray iris device purely electronically using ultrasonic waves. [Configuration] The ultrasonic generator 8 is fixed directly above the image receiving surface 7,
An ultrasonic receiver 9 is attached to the X-ray irradiator 1. The distance between the ultrasonic receiver 9 and the ultrasonic transmitter 8 changes as the X-ray irradiator 1 moves. This change in distance is electrically detected, an electrical signal corresponding to the detected value is obtained, and this electrical signal and the electrical signal of the film size detection device are used to
Controls the diaphragm mechanism of the automatic wire diaphragm and adjusts the opening/closing degree of the diaphragm.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on the distance between the X-ray focal point and the image receiving surface (film surface) in the X-ray automatic iris device. This invention relates to a distance detection device.

0002

[Conventional technology]

The automatic X-ray aperture device detects the size of the film loaded in the X-ray image receiving position. The detection value of the film size detection device and the distance that detects the distance between the X-ray focal point and the image receiving surface The aperture of the X-ray automatic diaphragm is controlled by each electric signal corresponding to the detection value of the detection device. The degree of opening and closing was controlled and the beam was configured to adjust automatically.

0003 Distance detection that detects the distance between the X-ray focus and the image receiving surface in conventional X-ray automatic iris devices The output device uses mechanical means to detect distance and responds to the detected value. The system is configured to automatically control the degree of opening and closing of the automatic X-ray diaphragm by converting it into an electrical signal. (For example, see Japanese Utility Model Publication No. 56-43787).

0004

[Problem that the idea aims to solve]

However, distance detection devices using conventional mechanical means have limited distance detection accuracy. There were also problems such as mechanical wear. The purpose of this invention is to improve the distance between the X-ray focus and the image receiving surface, which was previously achieved by mechanical means. The object of the present invention is to enable detection of separation to be performed purely electronically.

[0005]

[Means to solve the problem]

In order to achieve the above purpose, the X-ray focus and reception in the X-ray automatic iris device of the present invention are The distance detection device between image planes detects the size of the film loaded at the X-ray image receiving position. A film size detection device that detects the distance between the X-ray focal point and the image receiving surface. and the film size based on the electrical signals of the detected values obtained by both the above-mentioned detection devices. The X-ray automatic diaphragm consists of an X-ray automatic diaphragm that automatically adjusts the beam to The device uses ultrasonic waves to detect changes in the distance between the X-ray focus of the automatic X-ray diaphragm and the image receiving surface. The device is configured to detect the detected value and convert it into an electrical signal according to the detected value.

[0006] Place the ultrasonic generator and ultrasonic receiver on the image receiving surface side. However, it is effective to attach the other side to the X-ray irradiator side. Also, the guide rail The movable part is arranged so that it can be raised and lowered relative to the fixed part of the moving body, which is movable along the At the same time, an X-ray irradiator is attached to the movable part, and either the fixed part or the movable part An ultrasonic generator is placed on one side, an ultrasonic receiver is attached to the other, and the fixed part Ultrasonic detection of the distance change between the minute and movable parts, as well as preset fixed parts The relative distance between the X-ray focal point and the image receiving surface is calculated from the distance between It can also be configured to detect changes and convert them into electrical signals according to the detected value. Wear.

[0007]

[Effect]

When the X-ray irradiator is moved, the distance between the X-ray focal point and the image receiving surface is measured using ultrasound. The detection value is converted into an electrical signal corresponding to the detected value, and the opening/closing degree of the automatic X-ray diaphragm is automatically adjusted. controlled.

[0008]

【Example】

FIG. 1 shows an overall configuration diagram of a first embodiment of the device of the present invention. 1 is X-ray The irradiator is suspended on a movable body 21 movably provided on the guide rail 2. , move back and forth to change the X-ray irradiation position, and also move this moving body 21 in the vertical direction. The vertical position can be changed by raising and lowering or stretching the It is configured to 3 is the X-ray focus of X-ray irradiator 1, and 4 is the X-ray automatic diaphragm. , the degree of opening and closing of the aperture is automatically controlled by the output signal of the control circuit 5.

[0009] 6 is a size detection sensor that detects the film size, and it has two sides on the image receiving surface 7, vertically and horizontally. It is arranged so that it can be detected simultaneously in both directions. Detected by this size detection sensor 6 The detected values are each supplied to the control circuit 5 as electrical signals.

0010 Reference numeral 8 denotes an ultrasonic generator, which is fixed directly above the image receiving surface 7, and whose ultrasonic wave generator is Sound wave generation is controlled. 9 is an ultrasonic receiver, which is attached to the X-ray irradiator 1. Ru. The installation position of this ultrasonic receiver 9 is directly above the X-ray focus and the ultrasonic generator. It is installed in a position opposite to 8. Therefore, this ultrasonic receiver 9 As the irradiator 1 moves, the distance between it and the ultrasonic transmitter 8 changes. This distance change is electrically detected, an electrical signal corresponding to the detected value is input to the control circuit 5, and It is configured to measure the distance D between the line focal point 3 and the image receiving surface 7. 10 is power input It's the edge.

[0011] In this embodiment, the ultrasonic generator 8 is placed on the image receiving surface 7 side, and the ultrasonic receiver 9 is attached to X-ray irradiator 1, but if this arrangement is reversed, also yields exactly the same results. Infrared rays can also be used instead of ultrasound. Wear.

0012 FIG. 2 is a block diagram showing an example of the configuration of the ultrasonic generator 8 and the ultrasonic receiver 9. . In the ultrasonic generator 8, an oscillation circuit 81 oscillates based on a control signal from the control circuit 5. For example, the distance D between the X-ray focal point 3 and the image receiving surface 7 is is received by the ultrasonic receiver 9 through a space corresponding to the . The signal received by the ultrasonic receiver 9 The signal is input to the control circuit via the detection amplifier circuit 91.

[0013] FIG. 3 is a block diagram showing an example of the configuration of the control circuit 5. As shown in FIG. 51 is a pulse generator Then, the period for measuring the distance D between the X-ray focal point 3 and the image receiving surface 7 (for example, T = 50 m/s ) to determine. 52 is a reception control circuit, which is activated at the same time as the ultrasonic generator 8 starts transmitting ultrasonic waves. The frequency counter 53 turns on the frequency counter 53, and the frequency received by the ultrasonic receiver 9 is turned on. At this time, the frequency counter 53 is turned off.

[0014] 54 is a count pulse generation circuit, in which the ultrasonic waves transmitted from the ultrasonic generator 8 are The time required for reception by the acoustic wave receiver 9, that is, the distance between the X-ray focal point 3 and the image receiving surface 7 Pulse 344KHz/1mm (sound velocity: 25℃, 3 44m). During the period from on to off mentioned above, the frequency counter 53 The number of pulses generated by the count pulse generation circuit 54 is counted. (1 pulse (width is equivalent to 1 mm) Therefore, the total pattern counted by this frequency counter 53 is The distance between the ultrasonic generator 8 and the ultrasonic receiver 9 from the Luss number, that is, the X-ray focus 3 and the image receiving surface 7 can be measured.

[0015] 55 is a D/A conversion circuit that converts the digital signal from the frequency counter 53 into an analog A circuit that converts into a signal. 56 is a drive control circuit, which is output from the D/A conversion circuit 55. X by the analog signal and the analog signal from the film size detection device 11 The diaphragm mechanism of the automatic wire diaphragm 4 is controlled to adjust the opening/closing degree of the diaphragm. 57 is display switching For example, the display circuit 58 that digitally displays the distance may be displayed in inches. Or select "centimeter display".

[0016] FIG. 4 shows an overall configuration diagram of a second embodiment of the device according to the present invention. child In the embodiment shown in FIG. 4, the movement moving horizontally along the guide rail 2 The ultrasonic receiver 9 is attached to the fixed part 21A of the body 21, and the fixed part 2 An ultrasonic generator 8 is attached to a movable part 21B that moves up and down relative to 1A. . The movable part 21B of this moving body 21 can be raised and lowered by a length H. Therefore, the distance between the X-ray focal point 3 and the image receiving surface 7 can be changed. In the embodiment of FIG. 4, the distance between the fixed portion 21A and the image receiving surface 7 is set in advance. In addition, an ultrasonic generator 8 is attached to 1/4 of the entire movable part. Ru. In such a configuration, the distance that the X-ray focal point 3 actually moves is a fraction of the distance that the X-ray focus 3 actually moves. 1 in advance to prevent changes in the distance between the fixed part 21A and the movable part 21B. By detecting with sound waves, the length H between the fixed part 21A and the X-ray focal point 3 is determined, and It is configured to calculate the distance D between the line focal point 3 and the image receiving surface 7 using an arithmetic method and convert it into an electrical signal. has been completed.

[0017]

[Effect of the idea] As explained above, the distance between the X-ray focal point and the image receiving surface in the X-ray automatic iris device of the present invention is The distance detection device detects the change in relative distance between the moving X-ray irradiator and the receiving surface The distance between the X-ray focus and the image receiving surface is detected purely electronically using an ultrasonic generator and its receiver. Also, when calculating the distance, it can be freely converted to either addition or subtraction. is possible. Furthermore, unlike conventional mechanical methods, distance detection is extremely Can be performed accurately and minutely and continuously, allowing accurate opening and closing of the automatic X-ray diaphragm. Can be set to . Additionally, the ultrasonic generator and receiver are extremely easy to install. It can also be installed on conventionally used X-ray equipment. It is Noh.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing the overall configuration of a first embodiment of the device of the present invention.

FIG. 2 is a block diagram showing an example of the configuration of an ultrasonic generator and an ultrasonic receiver.

FIG. 3 is a block diagram showing an example of the configuration of a control circuit.

FIG. 4 is an overall configuration diagram showing the overall configuration of a second embodiment of the device according to the present invention.

[Explanation of symbols]

1 is an X-ray irradiator. 2 is a guide rail. 3 is the X-ray focus. 4 is an X-ray automatic diaphragm. 5 is a control circuit. 6 is a size detection sensor. 7 is an image receiving surface. 8 is an ultrasonic generator. 9 is an ultrasonic receiver. 10 is a power input terminal. 11 is a film size detection device. 21 is a moving body.

Claims (4)

[Scope of utility model registration request] Claim 1: A film size detection device for detecting the size of the film loaded in the X-ray image receiving position; a distance detection device for detecting the distance between the X-ray focal point and the image receiving surface; In an X-ray automatic diaphragm device that consists of an X-ray automatic diaphragm that automatically adjusts the beam to correspond to the film size based on the electrical signal of the detected value, either one of the moving X-ray irradiator and the image receiving surface side An ultrasonic generator is placed on one side, and an ultrasonic receiver is attached on the other. Changes in the distance between the X-ray focal point and the image receiving surface of the automatic X-ray diaphragm are detected using ultrasonic waves, and electricity is generated according to the detected value. 1. A distance detection device between an X-ray focal point and an image receiving surface in an X-ray automatic iris device, characterized in that the device is configured to convert the distance into a signal. 2. The X-ray automatic system according to claim 1, wherein an ultrasonic generator is disposed on the image receiving surface side, and an ultrasonic receiver is attached to an X-ray irradiator that moves along a guide rail. A device for detecting the distance between the X-ray focal point and the image receiving surface in an aperture device. 3. The X-ray according to claim 1, characterized in that an ultrasonic generator is attached to the X-ray irradiator that moves along the guide rail, and an ultrasonic receiver is arranged on the image receiving surface side. A device for detecting the distance between the X-ray focal point and the image receiving surface in an automatic aperture device. 4. A film size detection device that detects the size of the film loaded in the X-ray image receiving position, a distance detection device that detects the distance between the X-ray focal point and the image receiving surface, and a In an X-ray automatic diaphragm device comprising an X-ray automatic diaphragm that automatically adjusts a beam to correspond to the film size based on an electric signal of a detected value, the X-ray automatic diaphragm device is equipped with an X-ray irradiator. The movable part is configured to move up and down with respect to the fixed part, and an ultrasonic generator is arranged on one of the fixed part and the movable part, and an ultrasonic receiver is attached to the other. By detecting distance changes using ultrasound and calculating from the distance between a preset fixed part and the image receiving surface,
Between the X-ray focus and the image-receiving surface in an X-ray automatic diaphragm device, the X-ray automatic diaphragm is configured to detect a change in the relative distance between the X-ray focus and the image-receiving surface and convert it into an electrical signal according to the detected value. Distance detection device.