Experimental Validation of a Gamma Detector With a Novel Light-Guide-PMT Geometry to Reduce Dead Edge Effects
| Autor: | Beien Wang, R. Kreuger, J. Huizenga, Freek J. Beekman, Marlies C Goorden |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Photomultiplier Anger camera Detector dead edge Geometry Scintillator Edge (geometry) Atomic and Molecular Physics and Optics light-guide Anger Camera Semiconductor detector scintillator molecular breast imaging Radiology Nuclear Medicine and imaging gamma detector Instrumentation Sensitivity (electronics) Image resolution |
| Zdroj: | IEEE Transactions on Radiation and Plasma Medical Sciences, 4(1) |
| ISSN: | 2469-7303 2469-7311 |
| Popis: | Photomultiplier tube (PMT)-based scintillation cameras are predominant in molecular imaging but have the drawback that position estimation is severely degraded near the edges (dead edge effect). This leads to sensitivity losses and can cause severe problems in applications like molecular breast imaging and in certain SPECT devices. Using smaller light sensors or semiconductor detectors can solve this issue but leads to increased costs. Here we present a gamma detector based on standard PMTs with a novel light-guide-PMT geometry that strongly reduces dead edges. In our design, a monolithic NaI(Tl) scintillator is read out by square PMTs placed in a staggered arrangement. At the edge of the scintillator we inserted additional light-guides to emulate half-size PMTs. Detector performance was assessed for 99m Tc imaging; an average spatial resolution of 3.6 mm was measured over the whole detector, degrading to 4.0 mm within 30 mm to the critical edge. The dead edge of the scintillator is |
| Databáze: | OpenAIRE |
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