Title :
Initial characterization of a position-sensitive photodiode/BGO detector for PET
Author :
Derenzo, S.E. ; Moses, W.W. ; Jackson, H.G. ; Turko, B.T. ; Cahoon, J.L. ; Geyer, A.B. ; Vuletich, T.
Author_Institution :
Lawrence Berkeley Lab., California Univ., Berkeley, CA, USA
fDate :
2/1/1989 12:00:00 AM
Abstract :
The authors present initial results for a position-sensitive photodiode/BGO (bismuth germanate) detector for high-resolution, multilayer positron emission tomography (PET). Position sensitivity is achieved by dividing the 3 mm×20 mm rectangular photosensitive area along the diagonal to form two triangular segments. Each segment is individually connected to a low-noise charge amplifier. The photodiodes and crystals are cooled to -100°C to reduce dark current and increase the BGO signal. With an amplifier peaking time of 17 μs, the sum of the signals (511-keV photopeak) was 3200 electrons with a full width at half maximum (FWHM) of 750 electrons. The ratio of one signal to the sum determined the depth of interaction with a resolution of 11 mm FWHM
Keywords :
biomedical equipment; computerised tomography; photodetectors; photodiodes; radioisotope scanning and imaging; Bi12GeO20; PET; amplifier peaking time; crystals; dark current; low-noise charge amplifier; position-sensitive photodiode; positron emission tomography; Bismuth; Crystals; Dark current; Electrons; Low-noise amplifiers; Nonhomogeneous media; Photodiodes; Position sensitive particle detectors; Positron emission tomography; Signal resolution;
Journal_Title :
Nuclear Science, IEEE Transactions on
