Initial Results from the Donner 600 Crystal Positron Tomograph
作者： S. E. Derenzo , R. H. Huesman , J. L. Cahoon , A. Geyer , D. Uber
关键词: Scintillation counter 、 Physics 、 Bismuth germanate 、 Preamplifier 、 Particle detector 、 Nuclear physics 、 Point spread function 、 Mockup 、 Optics 、 Phototube 、 Coincidence 、 Nuclear and High Energy Physics 、 Electrical and Electronic Engineering 、 Nuclear Energy and Engineering
摘要: We describe a positron tomograph using single ring of 600 close-packed 3 mm wide bismuth germanate (BGO) crystals coupled to 14 phototubes. The phototube preamplifier circuit derives timing pulse from the first photoelectron, and sends it address coincidence circuits only if integrated height is within pre-set window. delays windows for all detectors are computer adjustable. An orbiting source used transmission measurements look-up table reject scattered random coincidences that do not pass through source. Data can be acquired stationary mode 1.57 lateral sampling or two-position clam 0.79 sampling. High maximum data rates provided by 45 parallel 4 histogram memory units. With bins, reconstructed point spread function (PSF) 0.35 diam 22Na wire at center circular with 2.9 full-width half-maximum (fwhm) PSF distance 8 cm elliptical radial fwhm 4.0 tangential 3.0 mm.
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