IV.X線写真の画質 : 視知覚系から見た場合の読影像のもつ特性(第31回総会)

概要

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In a field of radio-graph, it is important to evaluate quantities of this for diagnosticians. The quantities of a radio-graph are generally sorting a spatial frequency band-width, a signal-to-noise (S-N ratio) and a direct-range. The thresholds of the band-width and the S-N ratio which have been evaluated by visual system of each diagnostician, on individual diagnostic object in the radio-graph, are investigated respectively. On conclusions based on statistics, it is clear that the band-width and the S-N ratio required for the misread probability to be less than 0.5% are approximately 3〜4 line pair/mm and 20〜25 dB. Additionally, the access-time of reading the objects is quasi-hyperbolically increased as the S-N ratio is decreased.
公益社団法人日本放射線技術学会の論文
1975-11-01