Title :
Homogenization of the MultiChannel PM gain by inserting light attenuating masks
Author :
Christ, D. ; Hollendung, A. ; Larue, H. ; Parl, C. ; Streun, M. ; Weber, S. ; Ziemons, K. ; Halling, H.
Author_Institution :
Zentrallabor fuer Elektronik, Forschungszentrum Juelich GmbH, Germany
Abstract :
MultiChannel Photomultipliers (PM), like the R7600-00-M64 or R5900-00-M64 from Hamamatsu, are often chosen as photodetectors in high-resolution positron emission tomography (PET). A major problem of this PM is the nonuniform channel gain. In order to solve this problem, light attenuating masks were created. The aim of the masks is a homogenization of the output of all 64 channels using different hole sizes at the channel positions. The hole area, which is individually defined for the different channels, is inversely proportional to the channel gain. The measurements by inserting light attenuating masks improved a homogenization to a ratio of 1:1.2.
Keywords :
optical attenuators; photodetectors; photomultipliers; positron emission tomography; readout electronics; scintillation counters; Hamamatsu; MultiChannel Photomultipliers; PET; R5900-00-M64; R7600-00-M64; channel positions; high-resolution positron emission tomography; hole area; hole sizes; homogenization; light attenuating masks; multichannel PM gain; nonuniform channel gain; photodetectors; readout; Anodes; Attenuation measurement; Frequency measurement; Gain measurement; Light emitting diodes; Performance gain; Photomultipliers; Positron emission tomography; Pulse measurements; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2003 IEEE
Print_ISBN :
0-7803-8257-9
DOI :
10.1109/NSSMIC.2003.1352375
