三相全波整流装置と波尾切断型コンデンサ式装置の写真効果についての一考察

概要

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A condenser discharge type X-ray apparatus, which has capacitance of 3.2μF and a wave tail chopping device, has been developed. The characteristics of this machine, especially the X-ray spectra emitted, photographic effects such as film density, contrast and unsharpness of the X-ray picture have been investigated. The characteristics of a three phase X-ray machine, which has been considered as the most excellent diagnostic apparatus owing to the homogeneity of the X-ray, high permissible load of the X-ray tube and very short exposure time, have been also studied. The conculusion obtained by the comparison of these data are as follows : 1. The spectra of X-ray, emitted from the condenser apparatus, have more components in the short wave region than those given by the three phase apparatus. 2. The value of milliampere-seconds necessary for the same film density at the same tube voltage is less in the case of condenser apparatus than the three phase machine. 3. The unsharpness of X-ray picture of a phantom, obtained by the condenser apparatus is smaller than that obtained by the three phase machine, both pictures having the same contrast. In other words, the contrast of X-ray picture obtained by the condenser apparatus is better than that obtained by the three phase machine, both pictures having the same unsharpness.
公益社団法人日本放射線技術学会の論文
1960-06-20