Study of the Spatial Resolution in Gamma Detectors Using Photosensitive Wire Chambers in View of Their Use As High Resolution PET Scanners
Nuclear instruments and methods in physics research Section A, Accelerators, spectrometers, detectors and associated equipment/Nuclear instruments & methods in physics research Section A, Accelerators, spectrometers, detectors and associated equipment（1992）
摘要
The spatial resolution in gamma detectors using BaF2 scintillators and photosensitive wire chambers was studied for 511 keV gamma rays with different crystal geometries. When a matrix of small crystals was used, the spatial resolution was dominated by the crystal dimensions. With crystals measuring 3×3×20 and 2×2×15 mm3 and with 0.3 mm dead space between them, we obtained a resolution FWHM of 3.7 and 3.0 mm, respectively. With one large crystal 20 mm thick a resolution of 7.9 mm FWHM was obtained. We used a Monte Carlo study to evaluate the performances of a high resolution PET scanner for small animals based on this principle. Such a device is presently under construction.
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