Author :
Yamashita, T. ; Uchida, H. ; Okada, H. ; Kurono, T. ; Takemori, T. ; Watanabe, M. ; Shimizu, K. ; Yoshikawa, E. ; Ohmura, T. ; Satoh, N. ; Tanaka, E. ; Nohara, N. ; Tomitani, T. ; Yamamoto, M. ; Murayama, H. ; Endo, M.
Abstract :
A high-resolution positron emission tomograph (PET) for brain studies has been developed. It consists of five detector rings (240 BGOs/ring). New multisegment photomultiplier tubes (PMTs) were adopted for the system with 5-mm-wide BGOs. The system is designed to examine a patient sitting or lying down on a chair/bed couch. The functions of PMT auto gain control and real-time image display are implemented in the system. The physical performance of the system was evaluated: the spatial resolution is 3.5 mm in the transaxial plane and 5.7 mm in the axial direction, and the total system sensitivity is 109 kcps/μCi/ml for a uniform phantom 20 cm in diameter with a pulse height threshold of 350 keV
Keywords :
biomedical equipment; brain; computerised tomography; photomultipliers; radioisotope scanning and imaging; scintillation counters; Bi12GeO20; auto gain control; axial direction; brain studies; detector rings; high resolution PET; multisegment photomultiplier tubes; positron emission tomograph; pulse height threshold; real-time image display; spatial resolution; system sensitivity; transaxial plane; uniform phantom; Anodes; Energy resolution; Envelope detectors; Image resolution; Motion detection; Photonic crystals; Positron emission tomography; Real time systems; Solid scintillation detectors; Spatial resolution;
