Development of a prototype semiconductor gamma-camera system

Abstract

We made a prototype gamma camera system with CdZnTe semiconductor detectors that work at room temperature. The effective field of view of this detector is 195 × 156 mm 2 with a pixel size of 2.46 × 2.46 mm 2 . We evaluated the performance of the detector in terms of the energy resolution, intrinsic spatial resolution, system spatial resolution and system sensitivity. The performance of the detector was evaluated with methods based on the NEMA standard (NU1). The results showed that the mean energy resolution was 5.55 % FWHM for 99m Tc, the intrinsic spatial resolution 2.46 mm FWHM, the system spatial resolutions 7.1 mm FWHM (without scatterer) and 7.4 mm FWHM (with scatterer), and the system sensitivity 46.3 cps/MBq. The performance of the system was also evaluated with some SPECT phantoms and the feasibility of the detector was confirmed with the SPECT images.

Characterisation of a hand-held CZT-based gamma camera for 177Lu imaging

“…The anode is pixelated with 16 × 16 pixels using a pixel pad size of 1.86 × 1.86 mm 2 and a pixel pitch of 2.46 mm. Further description and characterisation of this, or a similar detector module was presented in [19][20][21]. The camera is equipped with collimators designed such that each hole is aligned one-to-one with an anode element, and can also be used with a protective cover (open field) with an air cavity in place of collimating material.…”

Comparison of a pixelated semiconductor detector and a non-pixelated scintillation detector in pinhole SPECT system for small animal study

“…Detector-1 was modeled in consideration with a realistic monolithic semiconductor detector such as MGC-700T2 (Oy Ajat, Finland) [12], and Detector-2 with a realistic modular-type semiconductor detector such as OMS40G256 (Orbotech Co., Israel) [10]. Detector-3 was modeled with a commonly used detector in small animal pinhole SPECT systems.…”