9 March 2015 DQE characterization of a high-energy in-line phase contrast prototype under different kVp and beam filtration
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Proceedings Volume 9324, Biophotonics and Immune Responses X; 932418 (2015) https://doi.org/10.1117/12.2082947
Event: SPIE BiOS, 2015, San Francisco, California, United States
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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Di Wu, Di Wu, Molly Wong, Molly Wong, Yuhua Li, Yuhua Li, Wei R. Chen, Wei R. Chen, Xizeng Wu, Xizeng Wu, Hong Liu, Hong Liu, } "DQE characterization of a high-energy in-line phase contrast prototype under different kVp and beam filtration", Proc. SPIE 9324, Biophotonics and Immune Responses X, 932418 (9 March 2015); doi: 10.1117/12.2082947; https://doi.org/10.1117/12.2082947
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