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KMID : 0384620100210010093
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Korean Journal of Medical Physics
2010 Volume.21 No. 1 p.93 ~ p.98
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Development of a High Resolution SPECT Detector with Depth-encoding Capability for Multi-energy Imaging: Monte Carlo Simulation
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Beak Cheol-Ha
Hwang Ji-Yeon
Lee Seung-Jae
Chung Yong-Hyun
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Abstract
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The aim of this work was to establish the methodology for event positioning by measuring depth of interaction (DOI) information and to evaluate the system sensitivity and spatial resolution of the new detector for I-125 and Tc-99m imaging. For this purpose, a Monte Carlo simulation tool, DETECT2000 and GATE were used to model the energy deposition and light distribution in the detector and to validate this approach. Our proposed detector module consists of a monolithic CsI(Tl) crystal with dimensions of 50.0×50.0×3.0 mm3. The results of simulation demonstrated that the resolution is less than 1.5 mm for both I-125 and Tc-99m. The main advantage of the proposed detector module is that by using 3 mm thick CsI(Tl) with maximum-likelihood position-estimation (MLPE) method, high resolution I-125 imaging and high sensitivity Tc-99m imaging are possible. In this paper, we proved that our new detector to be a reliable design as a detector for a multi-energy SPECT.
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KEYWORD
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DETECT2000 code, GATE, Resolution, Sensitivity, Maximum-likelihood position-estimation
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