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An analytical study of a three-dimensional positron-emission imaging system using both coincident pair-photon and noncoincident single-photon events is presented. The utilization of the noncoincident single-photon events at 511 keV to supplement the coincident pair-photon measurements for three-dimensional image reconstruction is described. Detector efficiency and resolution of this imaging system are calculated. Computer simulation and calculation of sensitivity, signal-to-noise ratio, noise background, and contrast are carried out for a cylindrical water phantom. Comparisons of these four factors between this imaging system and the conventional positron-emission imaging system are given.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Z. Liang (2003) studied this question.