DQEおよびNEQと信号検出理論の検出能との対応と走査開口について

概要

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In this paper, the general formulas concerning detective quantum efficiency (DQE) and noise-equivalent number of quanta (NEQ) were theoretically derived. DQE and NEQ become maximum in value when the scanning aperture of the micro-densitometer is the same size and form of the subject. Mathematically and strictly, DQE(u) and NEQ(u) were formally defined, in the integration of spatial frequency area by applying the inequality of Schwarz. Each integration of the product of DQE(u) or NEQ(u) due to the subjective power spectrum (or of the scanning aperture) is DQE_<max> and NEQ_<max>, respectively. Where, NEQ_<max> is qA・DQE_<max>. The detectability d' on the signal detection theory corresponds to √<NEQ_<max>>. Therefore, consequently, in the surrounding of the next important formula, [numerical formula] derived from the signal detection theory it became not only easy to understand but also close to be connected with many sorts of the results regarding the fields of the stochastic matrix theory, the frequency analysis theory, the photophysics and the statistical psychophysics. NEQ has a strong correlation to NEQ_<max> and the ability of image quality evaluation, but each image quality is necessarily compared with both NEQs, measured by circular apertures of larger and smaller diameters than approximate 0.3 mm under the conditions used in this paper.
社団法人日本放射線技術学会の論文
1987-05-01