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Self‐normalizing method to measure the detective quantum efficiency of a wide range of x‐ray detectors
Author(s) -
Stierstorfer Karl,
Spahn Martin
Publication year - 1999
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.598626
Subject(s) - detective quantum efficiency , measure (data warehouse) , image quality , detector , optical transfer function , noise (video) , optics , quality (philosophy) , quantum noise , x ray detector , function (biology) , physics , range (aeronautics) , medical imaging , mathematics , quantum , computer science , image (mathematics) , computer vision , artificial intelligence , quantum mechanics , materials science , composite material , database , evolutionary biology , biology
The detective quantum efficiency (DQE) is widely accepted as the most relevant parameter to characterize the image quality of medical x‐ray systems. In this article we describe a solid method to measure the DQE. The strength of the method lies in the fact that it is self‐normalizing so measurements at very low spatial frequencies are not needed. Furthermore, it works on any system with a response function which is linear in the small‐signal approximation. We decompose the DQE into several easily accessible quantities and discuss in detail how they can be measured. At the end we lead the interested reader through an example. Noise equivalent quanta and normalized contrast values are tabulated for standard radiation qualities.