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Proceedings Paper

Evaluation and comparison of high-resolution (HR) and high-light (HL) phosphors in the micro-angiographic fluoroscope (MAF) using generalized linear systems analyses (GMTF, GDQE) that include the effect of scatter, magnification, and detector characteristics
Author(s): Sandesh K. Gupta; Amit Jain; Daniel R. Bednarek; Stephen Rudin
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Paper Abstract

In this study, we evaluated the imaging characteristics of the high-resolution, high-sensitivity micro-angiographic fluoroscope (MAF) with 35-micron pixel-pitch when used with different commercially-available 300 micron thick phosphors: the high resolution (HR) and high light (HL) from Hamamatsu. The purpose of this evaluation was to see if the HL phosphor with its higher screen efficiency could be replaced with the HR phosphor to achieve improved resolution without an increase in noise resulting from the HR's decreased light-photon yield. We designated the detectors MAF-HR and MAF-HL and compared them with a standard flat panel detector (FPD) (194 micron pixel pitch and 600 micron thick CsI(Tl)). For this comparison, we used the generalized linear-system metrics of GMTF, GNNPS and GDQE which are more realistic measures of total system performance since they include the effect of scattered radiation, focal spot distribution, and geometric un-sharpness. Magnifications (1.05-1.15) and scatter fractions (0.28 and 0.33) characteristic of a standard head phantom were used. The MAF-HR performed significantly better than the MAF-HL at high spatial frequencies. The ratio of GMTF and GDQE of the MAF-HR compared to the MAF-HL at 3(6) cycles/mm was 1.45(2.42) and 1.23(2.89), respectively. Despite significant degradation by inclusion of scatter and object magnification, both MAF-HR and MAF-HL provide superior performance over the FPD at higher spatial frequencies with similar performance up to the FPD's Nyquist frequency of 2.5 cycles/mm. Both substantially higher resolution and improved GDQE can be achieved with the MAF using the HR phosphor instead of the HL phosphor.

Paper Details

Date Published: 17 March 2011
PDF: 10 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79614S (17 March 2011); doi: 10.1117/12.877714
Show Author Affiliations
Sandesh K. Gupta, Toshiba Stroke Research Ctr., Univ. at Buffalo (United States)
Amit Jain, Toshiba Stroke Research Ctr., Univ. at Buffalo (United States)
Daniel R. Bednarek, Toshiba Stroke Research Ctr., Univ. at Buffalo (United States)
Stephen Rudin, Toshiba Stroke Research Ctr., Univ. at Buffalo (United States)


Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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