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http://dx.doi.org/10.3807/JOSK.2016.20.6.663

A Numerical Study of Different Types of Collimators for a High-Resolution Preclinical CdTe Pixelated Semiconductor SPECT System  

Jeong, Hyun-Woo (Department of Biomedical Engineering and School of Medicine, Eulji University)
Kim, Jong Seok (Department of Radiological Science, Eulji University)
Bae, Se Young (Department of Radiological Science, Eulji University)
Seo, Kanghyen (Department of Radiological Science, Eulji University)
Kim, Seung Hun (Department of Radiological Science, Eulji University)
Kang, Seong Hyeon (Department of Radiological Science, Eulji University)
Shin, Dong Jin (Department of Radiological Science, Eulji University)
Lee, Chang-Lae (Department of Radiological Science, Yonsei University)
Kim, Kyuseok (Department of Radiological Science, Yonsei University)
Lee, Youngjin (Department of Radiological Science, Eulji University)
Publication Information
Journal of the Optical Society of Korea / v.20, no.6, 2016 , pp. 663-668 More about this Journal
Abstract
In single-photon-emission computed tomography (SPECT) with a pixelated semiconductor detector (PSD), not only pinhole collimators but also parallel-hole collimators are often used in preclinical nuclear-medicine imaging systems. The purpose of this study was to evaluate and compare pinhole and parallel-hole collimators in a PSD. For that purpose, we paired a PID 350 (Ajat Oy Ltd., Finland) CdTe PSD with each of the four collimators most frequently used in preclinical nuclear medicine: (1) a pinhole collimator, and (2) low-energy high-resolution (LEHR), (3) low-energy general-purpose (LEGP), and (4) low-energy high-sensitivity (LEHS) parallel-hole collimators. The sensitivity and spatial resolution of each collimator was evaluated using a point source and a hot-rod phantom. The highest sensitivity was achieved using LEHS, followed by LEGP, LEHR, and pinhole. Also, at a source-to-collimator distance of 2 cm, the spatial resolution was 1.63, 2.05, 2.79, and 3.45 mm using pinhole, LEHR, LEGP, and LEHS, respectively. The reconstructed hot-rod phantom images showed that the pinhole collimator and the LEHR parallel-hole collimator give a fine spatial resolution for preclinical SPECT with PSD. In conclusion, we successfully compared different types of collimators for a preclinical pixelated semiconductor SPECT system.
Keywords
Gamma ray; Photon detection; Medical application; Photodetectors;
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