1. 基礎と CR での測定(3. 解像特性, ディジタルラジオグラフィの画像評価)

概要

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The modulation transfer function (MTF) has been used successfully to characterize the resolution properties of conventional analog X-ray imaging systems such as screen/film systems. However, the interpretation of MTF in digital radiographic imaging systems requires caution because of non-shift invariance and the aliasing effect due to the discrete data sampling with insufficient rate. To overcome these problems, the concept of presampling MTF, which shows inherent resolution property of digital imaging system including the unsharpness of detector and the blurring effect of sampling aperture, was introduced by Giger and Doi. Two different methods for determining the presampling MTF beyond Nyquist frequency were developed and measured for I.I.-TV system and computed radiographic system with photostimulable phosphors by Fujita et al. The purpose of this paper is to show some problems of MTF analysis for digital imaging system and to show the methods for determining the presampling MTF briefly. We also discussed various component MTFs of CR system such as digital MTFs, laser-printer MTFs and overall MTFs.
公益社団法人日本放射線技術学会の論文
1991-06-01