Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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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)
  • Received : 2016.09.30
  • Accepted : 2016.11.30
  • Published : 2016.12.25
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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

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