A set of preliminary test results of a detector prototype for positron emission tomography applications is presented. The detector is made of a YAP:Ce finger crystal (2 × 2 × 30 mm 3 each) matrix coupled to a set of square section wavelength-shifting fibers (one fiber for each matrix row and one fiber for each matrix column) read by a position-sensitive detector. The recognition of each fiber allows the determination of the x-y position of the scintillation event. The light yield of the system has been investigated: all possible light loss factors have been taken into account to evaluate the expected signal. Experimental measurements with a single-pixel hybrid photodiodes have been performed. We have measured about ten photoelectrons for a deposit of 511 keV in the scintillator for each coordinate. Preliminary position measurements with a small 5 × 5 matrix are presented.
X-Y position readout of a YAP : Ce crystal matrix using wavelength-shifting fibers
ZAVATTINI, Guido;DI DOMENICO, Giovanni;
2001
Abstract
A set of preliminary test results of a detector prototype for positron emission tomography applications is presented. The detector is made of a YAP:Ce finger crystal (2 × 2 × 30 mm 3 each) matrix coupled to a set of square section wavelength-shifting fibers (one fiber for each matrix row and one fiber for each matrix column) read by a position-sensitive detector. The recognition of each fiber allows the determination of the x-y position of the scintillation event. The light yield of the system has been investigated: all possible light loss factors have been taken into account to evaluate the expected signal. Experimental measurements with a single-pixel hybrid photodiodes have been performed. We have measured about ten photoelectrons for a deposit of 511 keV in the scintillator for each coordinate. Preliminary position measurements with a small 5 × 5 matrix are presented.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
