NEQ (u) の測定誤差の検討

概要

論文の詳細を見る
A noise-equivalent number of quanta (u) (NEQ(u)) which included a gamma, a modulation transfer function (MTF) and a Wiener spectrum has provided useful means for evaluating the total image quality. However, the image quality evaluated by the NEQ(u) may be influenced by measuring errors of the gamma, the MTF and the Wiener spectrum, because the NEQ(u) is calculated from these three factors. Then, we measured fluctuations of measuring errors of these three factors employing two screen film systems of different speed and investigated effects for the NEQ(u). As the result, the NEQ(u) was influenced greatly by fluctuations of measured Wiener spectrum. But, fluctuations of NEQ(u) of these systems were quite little compared with NEQ(u) value of other systems. We concluded that the image quality of both systems can be distinguished clearly by using of NEQ(u) although the difference of the speed between two systems is quite little.
公益社団法人日本放射線技術学会の論文
1991-10-01