Imaging performance comparison between a LaBr3 :Ce scintillator based and a CdTe semiconductor based photon counting compactgamma camera
| Autor: | Russo, P., Mettivier, G., Pani, Roberto, Pellegrini, Rosanna, Cinti, Maria Nerina, Bennati, P. |
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| Přispěvatelé: | Russo, Paolo, Mettivier, Giovanni, R., Pani, R., Pellegrini, M. N., Cinti, P., Bennati |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
semiconductor counters
noise biomedical imaging cdte detector compact gamma camera image resolution labr 3:ce scintillator medipix2 photon counting solid scintillation detectors 29.40.Wk Solid-state detector Sensitivity and Specificity Cadmium Compounds Image Processing Computer-Assisted Humans Gamma Cameras 87.57.cf Spatial resolution Tomography Emission-Computed Single-Photon Photons Models Statistical Reproducibility of Results Equipment Design 87.57.U- Nuclear medicine imaging 29.40.Mc Scintillation detector Semiconductors Tellurium Crystallization Algorithms |
| Popis: | The authors report on the performance of two small field of view, compact gamma cameras working in single photon counting in planar imaging tests at 122 and 140 keV. The first camera is based on a LaBr3: Ce scintillator continuous crystal (49 x 49 x 5 mm3) assembled with a flat panel multianode photomultiplier tube with parallel readout. The second one belongs to the class of semiconductor hybrid pixel detectors, specifically, a CdTe pixel detector (14 x 14 x 1 mm3) with 256 x 256 square pixels and a pitch of 55 microm, read out by a CMOS single photon counting integrated circuit of the Medipix2 series. The scintillation camera was operated with selectable energy window while the CdTe camera was operated with a single low-energy detection threshold of about 20 keV, i.e., without energy discrimination. The detectors were coupled to pinhole or parallel-hole high-resolution collimators. The evaluation of their overall performance in basic imaging tasks is presented through measurements of their detection efficiency, intrinsic spatial resolution, noise, image SNR, and contrast recovery. The scintillation and CdTe cameras showed, respectively, detection efficiencies at 122 keV of 83% and 45%, intrinsic spatial resolutions of 0.9 mm and 75 microm, and total background noises of 40.5 and 1.6 cps. Imaging tests with high-resolution parallel-hole and pinhole collimators are also reported. |
| Databáze: | OpenAIRE |
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