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Proceedings Paper

MTF and NPS of single-shot dual-energy sandwich detectors
Author(s): Junwoo Kim; Dong Woon Kim; Hanbean Yun; Ho Kyung Kim
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Paper Abstract

The actual meaning of the modulation-transfer function (MTF) and the noise-power spectrum (NPS) is ambiguous in dual-energy images obtained from the single-shot sandwich detector, and their properties for various detector design parameters are also being questioned. In this study, the authors regard the sandwich detector including weighted logarithmic subtraction operation as a single black-box detector, and measure the single-shot dual-energy MTF and NPS performances. Subtraction of two images obtained from the sub-detector layers, which have different thick x-ray converters (hence, different spatial-resolution performances), of the sandwich detector yields a band-pass filter characteristic of the MTF. On the other hand, the NPS is the weighted sum of each NPS obtained from the sub-detector layers. The MTF characteristic is reflected into the DQE, hence the DQE shows a similar band-pass filter characteristics. Therefore, the sandwich detector may lose the contrast performance for large-area objects, but it may emphasize the contrast performance for objects with importance at mid-frequency information.

Paper Details

Date Published: 30 March 2016
PDF: 8 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97833X (30 March 2016); doi: 10.1117/12.2216695
Show Author Affiliations
Junwoo Kim, Pusan National Univ. (Korea, Republic of)
Dong Woon Kim, Pusan National Univ. (Korea, Republic of)
Hanbean Yun, Pusan National Univ. Yangsan Hospital (Korea, Republic of)
Pusan National Univ. (Korea, Republic of)
Ho Kyung Kim, Pusan National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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