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Proceedings Paper

DQE characterization of a high-energy in-line phase contrast prototype under different kVp and beam filtration
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Paper Abstract

The objective of this research is to characterize the detective quantum efficiency (DQE) of a high-energy in-line phase contrast prototype operated under different x-ray exposure conditions.

First of all, an imaging prototype was demonstrated based on a high-energy in-line phase contrast system prototype. The DQE of this system is calculated through modulation transfer function (MTF), noise power spectrum (NPS) and input signal to noise ratio under a fixed radiation dose. The radiation dose was estimated by employing a 4-cm-thick BR12 phantom. In this research, the x-ray exposure conditions were modified by not only using different tube voltage but also different prime beam filtration. Aluminum, Molybdenum, Rhodium, and a combined filter were selected to acquire a variety of x-ray energy compositions with 100, 110 and 120 kVp exposures. The resultant curves are compared through the modes of different kVp/same filter and different filter/same kVp.

As a result, the curves obtained under a fixed radiation dose, indicate that the MTF performs similar behavior under different experimental mode; the NPS is majorly affected by the composition of x-ray photon energies; and the overall DQE decreases with the increasing portion of high-energy x-ray photons in the exposure.

Paper Details

Date Published: 9 March 2015
PDF: 10 pages
Proc. SPIE 9324, Biophotonics and Immune Responses X, 932418 (9 March 2015); doi: 10.1117/12.2082947
Show Author Affiliations
Di Wu, The Univ. of Oklahoma (United States)
Molly Wong, The Univ. of Oklahoma (United States)
Yuhua Li, The Univ. of Oklahoma (United States)
Wei R. Chen, Univ. of Central Oklahoma (United States)
Xizeng Wu, The Univ. of Alabama at Birmingham (United States)
Hong Liu, The Univ. of Oklahoma (United States)


Published in SPIE Proceedings Vol. 9324:
Biophotonics and Immune Responses X
Wei R. Chen, Editor(s)

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