Journal Article

Measurement of the modulation transfer function of digital X-ray detectors with an opaque edge-test device

Hartmut Illers, Egbert Buhr, Susanne Günther-Kohfahl and Ulrich Neitzel

in Radiation Protection Dosimetry

Volume 114, issue 1-3, pages 214-219
Published in print May 2005 | ISSN: 0144-8420
Published online May 2005 | e-ISSN: 1742-3406 | DOI: https://dx.doi.org/10.1093/rpd/nch506
Measurement of the modulation transfer function of digital X-ray detectors with an opaque edge-test device

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A variant of the edge method for the determination of the pre-sampled modulation transfer function (MTF) of digital X-ray imaging devices has been developed and accepted as the standard method in the novel DQE measurement standard IEC 62220-1. An opaque tungsten edge-test device accomplishes the ideal step-like profile of the incident X rays. The edge spread function is measured over a large region across the edge transition that enables an accurate MTF measurement including the ‘low-frequency drop’. The method has been applied to different state-of-the-art X-ray imaging detectors, a computed radiography, a CsI-based indirect and an Se-based direct flat-panel detector. The MTF measurement results will be presented. In contrast to the opaque edge device, the commonly used semi-transparent edge-test devices produce scatter radiation that deteriorates the incident X-ray profile, which leads to a systematic overestimation of the MTF.

Journal Article.  2580 words.  Illustrated.

Subjects: Nuclear Chemistry, Photochemistry, and Radiation

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