Experimental Study of an Easily Controlled Ultra-High-Resolution Pixel-Matched Parallel-Hole Collimator with a Small Cadmium Zinc Telluride Pixelated Gamma Camera System
- Department of Radiological Science, Konyang University, Daejeon (Korea, Republic of)
- Department of Radiological Science and Convergence Engineering, Yonsei University, Wonju-si, Gangwon-do (Korea, Republic of)
- Department of Radiological Science, Eulji University, Seongnam-si, Gyeonggi-do (Korea, Republic of)
The aim of this study was to develop an easily controlled, ultra-high-resolution, tungsten parallel-hole collimator based on a small pixelated gamma camera system. A small cadmium zinc telluride (CZT) pixelated semiconductor detector (eValuator-2500 detector [eV product, Saxonburg, PA]) was evaluated. This detector is composed of an array of 51.2 × 0.8 × 3-mm{sup 3} individual CZT crystal elements. The ultra-high-resolution, pixel-matched, parallel-hole collimators consisted of six layers, with the same between the hole and pixel size. The basic characteristics of the imaging system, such as sensitivity and spatial resolution, was measured using a {sup 57}Co point source. The measured averages of sensitivity and spatial resolution varied depending on the septal heights of the ultra-high-resolution parallel-hole collimator and source-to-collimator distances. When the 30-mm septal height was at 1-cm source-to-collimator distance, the spatial resolution was approximately 0.85 mm. Using 5-mm septal height, over 0.3 cps/kBq sensitivity was achieved. One advantage of our system is the use of stacked collimators that can select the best combination of system sensitivity and spatial resolution. Our results demonstrated that the developed CZT–pixelated gamma camera system using an ultra-high-resolution parallel-hole collimator of various collimator geometric designs has potential as an effective instrument.
- OSTI ID:
- 22941103
- Journal Information:
- Journal of Medical Imaging and Radiation Sciences, Journal Name: Journal of Medical Imaging and Radiation Sciences Journal Issue: 3 Vol. 47; ISSN 1939-8654
- Country of Publication:
- United States
- Language:
- English
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