JPH0339920Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The invention is used in the field of X-ray photography.

The present invention relates to a phototimer device for X-ray photography for medical rounds.

(B) Prior art A mobile X-ray imaging device does not have an imaging table unique to this device and is used for X-ray imaging using the patient's bed, so it cannot be used with general X-ray high voltage equipment. As described above, it is impossible to arrange the phototimer light receiving section at the front of the cassette and perform phototimer photography.

Therefore, in order to perform phototimer imaging using an X-ray high-voltage device for medical rounds, a special cassette holder with a built-in phototimer light receiving section is required.
Technically, a lightweight and small light receiving unit and a wireless X-ray blocking signal transmitting device are required.

In such a conventional example, the light receiving section has a semiconductor detector, the transmitting section has an AM or FM modulation circuit,
A battery power supply is built into the cassette holder.

(c) Problems to be solved by the invention However, such AM or FM modulation circuits consume excessive power due to problems such as large output and constant operation, and batteries that can be built into cassette holders are not suitable. It cannot actually be used.

Furthermore, since the oscillation frequency is used, noise is added to the weak current circuit of the light receiving section, causing malfunction.

The purpose of this invention is to be built into a cassette holder, lightweight and compact, and suitable for low power consumption.
To provide a phototimer device for X-ray photography for medical rounds, which does not introduce noise into a light receiving part and has stable functions.

(d) Means for solving the problem The above purpose is to have a cassette holder placed under the patient lying on the bed, and to send an X-ray cutoff signal to a phototimer built into the cassette holder. A light conversion circuit is added to output the light signal as an optical signal, and the transmission window for the light signal is placed in a part of the cassette holder that does not overlap with the subject, and the other light receiving sensor is connected to the X-ray tube attached to the X-ray tube. This is achieved by placing the collimator at or near the collimator and sending the signal detected by the light receiving sensor to the X-ray controller as an X-ray cutoff signal.

(E) Effect A photoconversion element is inserted in the transmitting circuit between the cassette holder and the X-ray controller, and a photo sensor is used in the receiving circuit, and a bias power source is used only during operation, so low power is required. . Also, since it is an optical reception, there is no problem with noise.

(F) Embodiments A preferred embodiment of the present invention will be explained based on the drawings.

Figure 1 shows the overall configuration of one embodiment, Figure 2 shows the circuit diagram of the receiver section attached to the collimator in the upper part, and the phototimer and transmitter circuit diagram built in the cassette holder in the lower part. ing.

A controller section 2, an X-ray tube 3, and a collimator 4 are arranged around the X-ray high-voltage device 1 for medical rounds. In the illustrated embodiment, a transmitting window 9 and a transmitting/receiving confirmation button 8 can be seen on the cassette holder 5, and a receiver section or receiving window 7 and a transmitting/receiving confirmation indicator light 6 can be seen on the collimator 4. When X-rays are emitted from the X-ray tube 3, the X-rays that have passed through the human body form an X-ray image on an X-ray film in the cassette 5'.

At the same time, a phototimer built into the cassette holder 5 behind the cassette 5' operates.

The phototimer includes a semiconductor detection circuit 10, an amplifier 11, an integrator 12, and a comparator 13. First, the output signal of the semiconductor detection circuit 10 is transmitted to the amplifier 11.
The signal is amplified by the integrator 12, which has been initialized in advance by a reset signal, and its output is sent to the comparator 13. The comparator 13 compares the integral signal and the concentration setting signal, and when they become the same value,
A signal is output as a line cutoff signal.

This output signal is converted into an output signal with a constant width by the one-shot circuit 14, and the driver 14 drives the infrared light emitting diode 15, which emits light as an optical signal from the transmission window 9 toward the receiver section attached to the collimator 4. Ru.

An infrared phototransistor 17 in the receiver section receives the optical signal through the receiving window 7 and converts it into an electrical signal. The X-ray cutoff signal generator 16 converts the signal into a signal detectable by the X-ray controller section 2, and the X-ray cutoff signal is transmitted to the controller section 2 to cut off the X-rays.

The conventional FM modulation transmitting circuit corresponds to the one-shot + driver 14 and the infrared diode in this embodiment, and the conventional FM demodulation receiving circuit corresponds to the X-ray cutoff signal generator 16 and the infrared phototransistor 17 in this embodiment. corresponds to

In addition, since there is a risk of interference with optical signals during X-ray emission, it is preferable to use infrared rays whose wavelength is different from that of X-rays, and filters are used in the transmitting and receiving windows 9 and 7 to prevent ultraviolet rays and visible light. It is desirable to prevent malfunctions.

Further, since the cassette and cassette holder are placed under the human body, if an obstacle enters between the transmitting window and the receiving window, the light is blocked and the signal is likely to be interrupted. Therefore, in order to confirm whether the signal is transmitted reliably before irradiating the X-ray, the transmit/receive confirmation button 8
and a transmission/reception confirmation indicator light 6, which are also shown in the illustrated embodiment.

When the confirmation button 8 is pressed, the one shot + driver 14 operates, the infrared light emitting diode 15 outputs a signal for a certain period of time, and the transmission/reception confirmation indicator light 6 lights up via the infrared phototransistor 17 and the X-ray cutoff signal generator 16. do. It is confirmed that there are no obstructions, and X-ray photography can be performed with confidence.

Although not shown, in an embodiment in which a transmitting circuit is attached near the collimator and a receiving circuit is attached to the cassette holder to enable bidirectional signal transmission, the timing of the ready signal from the operation panel can be adjusted. If the X-ray cutoff signal confirmation circuit is activated by detecting the signal and confirming transmission and reception, the confirmation button will no longer be necessary.

(g) Effects According to the present invention, a wireless transmission method that is lighter in weight and consumes less power than conventional methods has been realized, and has a receiving circuit with less noise.The cassette holder is also lighter at the same time. The effect is that it is easy to add a circuit and reliable operation is guaranteed.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing one embodiment of the present invention, and FIG. 2 is a detailed circuit diagram thereof. 2 is an X-ray controller, 4 is a collimator, 5 is a cassette holder, 7 is a receiving window, 9 is a transmitting window, 14 and 15 are transmitting circuits, and 16 and 17 are receiving circuits.

Claims (1)

[Scope of utility model registration request] It has a cassette holder placed under the patient lying on the bed, and an optical conversion circuit is added to the phototimer built into the cassette holder to output the X-ray blocking signal as an optical signal. The optical signal transmission window is placed in a part of the cassette holder that does not overlap with the subject, and the light receiving sensor is placed on or near the X-ray collimator attached to the X-ray tube, so that the signal detected by the light receiving sensor is X
A phototimer device for X-ray photography for medical rounds, characterized in that a radiation cutoff signal is sent to an X-ray controller.