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Proceedings Paper

Physical measures of image quality in photostimulable phosphor radiographic systems
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Paper Abstract

The purpose of this study was to critically assess and compare the intrinsic resolution, noise, and signal-to-noise transfer characteristics of two modern digital photostimulable phosphor (PSP) radiographic systems. Two commercial PSP systems were evaluated by identical methodologies. Measurements were made at three beam qualities using standard-resolution and high-resolution screens. The presampled modulation transfer functions (MTF) of the systems were measured using an edge method. The noise power spectra (NPS) were determined by 2D Fourier analysis of uniformly exposed radiographs. The frequency-dependent detective quantum efficiencies (DQE) were obtained from the MTF and NPS measures and the input signal-to-noise ratio, determined by a computational model for x-ray spectrum which was verified against exposure and half-value-layer measurements. The physical performance of the systems were very similar; a DQE of 0.24 and a spatial frequency of 2.5 cycles/mm at 0.2 MTF were estimated for both systems at 115 kVp using a pixel size of 0.1 mm and standard-resolution screens. The HD screen provided improved MTF with an adverse effect on noise as compared to the GP-25 screen using the same pixel size and beam quality.

Paper Details

Date Published: 2 May 1997
PDF: 11 pages
Proc. SPIE 3032, Medical Imaging 1997: Physics of Medical Imaging, (2 May 1997); doi: 10.1117/12.273999
Show Author Affiliations
Ehsan Samei, Henry Ford Health System and Univ. of Michigan (United States)
Michael J. Flynn, Henry Ford Health System and Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 3032:
Medical Imaging 1997: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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