Imaging performance comparison between a LaBr{sub 3}:Ce scintillator based and a CdTe semiconductor based photon counting compact gamma camera

Journal Article · Wed Apr 15 00:00:00 EDT 2009 · Medical Physics

DOI:https://doi.org/10.1118/1.3081412· OSTI ID:22095327

Russo, P.; Mettivier, G.; Pani, R.; Pellegrini, R.; Cinti, M. N.; Bennati, P. ^[1]

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1. Dipartimento di Scienze Fisiche, Universita di Napoli Federico II, I-80126 Napoli (Italy) and INFN Sezione di Napoli, I-80126 Napoli (Italy)

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 LaBr{sub 3}:Ce scintillator continuous crystal (49x49x5 mm{sup 3}) 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 (14x14x1 mm{sup 3}) with 256x256 square pixels and a pitch of 55 {mu}m, 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 {mu}m, and total background noises of 40.5 and 1.6 cps. Imaging tests with high-resolution parallel-hole and pinhole collimators are also reported.

• OSTI ID: 22095327
• Journal Information: Medical Physics, Vol. 36, Issue 4; Other Information: (c) 2009 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-2405
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
62 RADIOLOGY AND NUCLEAR MEDICINE
BACKGROUND NOISE
CADMIUM TELLURIDES
CDTE SEMICONDUCTOR DETECTORS
COMPARATIVE EVALUATIONS
GAMMA CAMERAS
IMAGES
KEV RANGE 100-1000
KEV RANGE 10-100
LANTHANUM BROMIDES
PERFORMANCE
PHOTONS
RADIATION DETECTION
SEMICONDUCTOR MATERIALS
SOLID SCINTILLATION DETECTORS
SPATIAL RESOLUTION