Title :
A practical block detector for a depth encoding PET camera
Author :
Rogers, Joel G. ; Moisan, Christian ; Hoskinson, Emile M. ; Andreaco, M.S. ; Williams, C.W. ; Nutt, R.
Author_Institution :
TRIUMF, Vancouver, BC, Canada
Abstract :
The depth-of-interaction effect in block detectors degrades the image resolution in commercial PET cameras and impedes the natural evolution of smaller, less expensive cameras. A method for correcting the measured position of each detected gamma ray by measuring its depth-of-interaction was tested and found to recover 38% of the lost resolution in a table-top 50 cm diameter camera. To obtain the desired depth sensitivity, standard commercial detectors were modified by a simple and practical process, which is suitable for mass production of the detectors. The impact of the detector modifications on central image resolution and on the ability of the camera to correct for object scatter were also measured
Keywords :
biomedical equipment; cameras; gamma-ray detection; image resolution; positron emission tomography; solid scintillation detectors; 50 cm; central image resolution; depth encoding PET camera; depth sensitivity; depth-of-interaction effect; detector modifications; image resolution degradation; measured position correction method; medical diagnostic imaging; medical instrumentation; nuclear medicine; object scatter correction; practical block detector; smaller less expensive cameras; standard commercial detectors; table-top 50 cm diameter camera; Cameras; Degradation; Detectors; Encoding; Gamma ray detection; Image resolution; Impedance; Loss measurement; Position measurement; Positron emission tomography;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-3180-X
DOI :
10.1109/NSSMIC.1995.500383
