HU191864B - Detector unit for apparatus of x-ray diagnostic - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to a detector unit for X-ray diagnostic apparatus for measuring exposure rate, which can be used to automatically adjust exposure, exposure, and radiation exposure to X-ray dose control. The detector unit according to the invention has a detector space (2) formed from a carrier (5), in which a detector scintillation element (6) of 1-4096 with light guides (7) is arranged, the light guides (7) from the detector space (2) are opto detectors (3) connected to output level transducers (4), the detector space (2) and the opto detectors (3) equipped with the signal level converter (4) are provided with a light-impermeable cover (1), from which the signal level converters (4) are output, completely shielded from light. International class designation: (51) NSZO4 A 61 B6 / 00 H05 G 1/28 Patent Library. ' 4Í / LAJDONA -1-

Description

BACKGROUND OF THE INVENTION The present invention relates to a detector unit for an X-ray diagnostic apparatus for measuring the exposure rate, which can be used to automatically adjust the exposure and illumination and radiation exposure ratios when controlling the X-ray dose.

Currently, the exposure automation uses an ionization chamber which integrates the dose to measure the dose, i.e., the dose is the integral of the exposure ratio over the duration of the exposure, the length of which is pre-set and the exposure is terminated when the preset dose is reached. Such solutions are known, for example, from 2,415,410; 2,427,418; 2,430,142; from the disclosure documents of the Federal Republic of Germany 2,446,226. In the above solutions, a new measurement can only be restarted if the unit is reset first, which determines the initial conditions for the next measurement. This makes it impossible to repeat the measurement in cases where the exposure has to be repeated several times in succession, and the rapid changes in the X-rays cannot be measured during the exposure.

With the ionization chamber detector unit, instantaneous values during exposure cannot be determined by sampling. Ionization chambers are susceptible to electrical interference by operation.

Due to the integrating function of the ionization chambers, these detector elements are not suitable for automation of illumination. Currently, the method used to determine the illumination is the one used in the dominant TV signal area or the output of an X-ray amplifier. Indirect methods are like having only one detector element in the center of the image, requiring additional light sensing elements and auxiliary circuits outside the exposure control circuitry.

It is an object of the present invention to overcome these drawbacks. The invention is based on the discovery that the above-mentioned drawbacks can be overcome by using scintillation elements instead of ionization chambers to detect radiation, so that the X-ray image is not disturbed during the measurement.

The object of the present invention has been achieved by providing an x-ray diagnostic detector unit in which the detector space is formed by a carrier having from 1 to 4096 detector scintillation elements provided with photoconductive elements, the light; conductive elements are output from the detector compartment to optical detectors with signal transducers, the detector compartment and optical detectors with signal transducers are provided with a light-transmitting cover, from which the signal transducer terminals are also completely shielded from light.

Advantages of the X-ray diagnostic detector unit according to the invention are as follows:

We use a common automation for exposure and illumination automation. The output signals of the detector unit are proportional to the exposure ratio of the X-rays, which allows sampling of a momentary value of the exposure ratio according to a specific measurement algorithm to obtain information over a period of time the increase in the dose of X-rays, and to control the X-rays during pulses during pulse scans (X-rays).

The detector unit allows the use of algorithms for automatic control of X-rays, which significantly improve the diagnostic value of the exposure and the hygiene conditions of the radiation operations. Instead of using a long X-ray examination, only pulsed scans or higher energy scans are used. 10 examples. The detection scintillation element is insensitive to interference from the electric field, so that its own detection space does not need to be shielded.

The detector unit of the present invention will now be described in more detail with reference to Figure 1, with reference to an exemplary embodiment.

As shown in Fig. 1, the opaque housing 2 comprises, on the one hand, a detector space 2 and, on the other hand, optoelectors 3 and signal level converters 4. The detector space 2 is filled with a carrier 5, and the detection scintillation elements 6 and light guides 7 are placed there. The optical outputs of the detector scintillation elements 6 are output from the detector space 2 through the light guides 7 to the optodetectors 3, the outputs of which are output through the signal converters 4 from the opaque housing 1.

The detector assembly of the present invention was tested in a medical diagnostic apparatus, normally placed between the secondary Bucky plate and the recording unit or, if necessary, an X-ray image converter. This detector unit contains a 350x350mm or 430X430mm detector space 2, which has three detector scintillation elements 6 made of plastic scintillator, 7 photoconductors for Umaplex, 3 photoconductors for 3 opto-detectors and 2 amplifiers for 4 level transducers employed.

The substrate 5 used is polystyrene or the like, which is the detector scintillation 6. elements and a constant geometric arrangement of the light guides 7.

The detector unit according to the invention enables the above specific example to be implemented, in particular the detector space 2, which is advantageous in terms of the minimum absorption of transmitted X-rays.

The detector unit of the present invention can also be used in medical diagnostics in computed tomography for X-ray diagnostics and analysis.

Claims (1)

Patent claim 1. A detector unit for X-ray diagnostic apparatus for measuring exposure rate, characterized by a detector space (2) formed from a carrier 55 (') having a detector scintillation e'em (6) with light conductors (7), i-4096 arranged, the light guides (7) are discharged from the detector space (2) to opto detectors (3) whose outputs are connected to a signal level converter (4), the detector space (2) and the optoelectric ducts provided with the signal level converter (4) (3) is provided with a light-impermeable housing (1) from which the signal level transducers (4) are completely shielded from the output light. db figure _ -2191 864 NO ₄ : A 61 Β 6/00 Η 05 G 1/28