I.自動露出機構の基本特性(X線装置の自動露出機構について)

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The automatic exposure control devices used in Japan, are ionization chamber devices, and photo-multiplier fluorescence X-ray detector devices (so called phototimer). Phototimers occupy 93% of the distributions. The components of the automatic exposure control systems are the X-ray termination timing unit and the X-ray generator (Fig. 1). To evaluate these systems' performances, first of all, it is necessary to consider the dynamic characteristics of the X-ray generators. The X-ray generators' dynamic characteristics at the view point of the automatic exposure control systems are accuracy of X-ray tube voltage, tube current, and opening and closing response of the main circuit. Though the automatic exposure control device has an excellent performance, the total system performance may be in lower state with the poor X-ray generator dynamic characteristics. The fundamental characteristics of the automatic exposure control systems are response time, X-ray tube voltage dependence and object thickness characteristics. This report deals with these fundamental characteristics and states the performances of several kinds of the systems actually working in Japan. The respective shortest response time of these systems, built in a 12 peak generator and 2 peak generators, are 5,39 and 60ms. The shortest X-ray termination delay time from the termination timing of the device is 1ms of a 12 peak generator, and 10 ms of a 2 peak generator. The range of most of generators, is 1-30 ms. Tube voltage dependence compensations are insufficient. Object thickness charcteristics are well designed for several types and insufficient for a few systems. Film density differences for phantom thicknesses from 5cm to 20cm, are 0.1-0.4. The difference 0.4 means worse characteristics. The clinical radiographs by means of these systems are illustrated in this report. These evaluation methods are usefull for diagnostic radiological technology and the quality assurance.
1980-09-01

I.自動露出機構の基本特性(X線装置の自動露出機構について)

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