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KMID : 0384620080190040291
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Korean Journal of Medical Physics
2008 Volume.19 No. 4 p.291 ~ p.297
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Optimization of Parallel-Hole Collimator for Small Gamma Camera Based on Pixellated Crystal Array
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Chung Yong-Hyun
Beak Cheol-Ha
Lee Seung-Jae
Park Jin-Hyung
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Abstract
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The purpose of this study is to optimize a parallel-hole collimator for small gamma camera having the pixellated crystal array and evaluate the effect of crystal-collimator misalignment on the image quality using a simulation tool GATE (Geant4 Application for Tomographic Emission). The spatial resolution and sensitivity were measured for the various size of hexagonal-hole and matched square-hole collimators with a Tc-99m point source and the uniformity of flood image was estimated as a function of the angle between crystal array and collimator by misalignment. The results showed that the spatial resolution and sensitivity were greatly improved by using the matched collimator and the uniformity was reduced by crystal-collimator misalignment.
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KEYWORD
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Matched collimator, Pixellated crystal array, Spatial resolution, Sensitivity, Uniformity
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