A practical block detector for a depth-encoding PET camera

Author

Rogers, Joel G. ; Moisan, Christian ; Hoskinson, Emile M. ; Andreaco, Mark S. ; Wiiliams, C.W. ; Nutt, Ronald

Author_Institution

TRIUMF, Vancouver, BC, Canada

Volume

43

Issue

6

fYear

1996

fDate

12/1/1996 12:00:00 AM

Firstpage

3240

Lastpage

3248

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 at 7.5 cm radius in a tabletop, 50-cm-diameter camera. To obtain the desired depth sensitivity, standard commercial detectors were modified by a simple and practical process that 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; image resolution; positron emission tomography; solid-state nuclear track detectors; 50 cm; 7.5 cm; depth sensitivity; depth-encoding PET camera; depth-of-interaction; detected gamma ray position; detector modifications; image resolution degradation; mass production; medical diagnostic imaging; medical instrumentation; nuclear medicine; object scatter correction; practical block detector; Cameras; Degradation; Gamma ray detection; Gamma ray detectors; Image resolution; Impedance; Loss measurement; Position measurement; Positron emission tomography; Testing;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.552726

Filename

552726