First Test Of A New High Resolution Positron Camera With Four Area Detectors

E. Van Laethem; S. Kuijk; F. Deconinck; M. Van Miert; M. Defrise; D. Townsend; M. Wensveen

doi:10.1117/12.961736

18 October 1989 First Test Of A New High Resolution Positron Camera With Four Area Detectors

E. Van Laethem, S. Kuijk, F. Deconinck, M. Van Miert, M. Defrise, D. Townsend, M. Wensveen

Proceedings Volume 1137, Science and Engineering of Medical Imaging; (1989) https://doi.org/10.1117/12.961736
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France

Abstract

A PET camera consisting of two pairs of parallel area detectors has been installed at the cyclotron unit of VUB. The detectors are High Density Avalanche Chambers (HIDAC) wire-chambers with a stack of 4 or 6 lead gamma-electron converters, the sensitive area being 30 by 30 cm. The detectors are mounted on a commercial gantry allowing a 180 degree rotation during acquisition, as needed for a fully 3D image reconstruction. The camera has been interfaced to a token-ring computer network consisting of 5 workstations among which the various tasks (acquisition, reconstruction, display) can be distributed. Each coincident event is coded in 48 bits and is transmitted to the computer bus via a 512 kbytes dual ported buffer memory allowing data rates of up to 50 kHz. Fully 3D image reconstruction software has been developed, and includes new reconstruction algorithms allowing a better utilization of the available projection data. Preliminary measurements and imaging of phantoms and small animals (with 18FDG) have been performed with two of the four detectors mounted on the gantry. They indicate the expected 3D isotropic spatial resolution of 3.5 mm (FWHM, line source in air) and a sensitivity of 4 cps/μCi for a centred point source in air, corresponding to typical data rates of a few kHz. This latter figure is expected to improve by a factor of 4 after coupling of the second detector pair, since the coincidence sensitivity of this second detector pair is a factor 3 higher than that of the first one.

Citation Download Citation

E. Van Laethem, S. Kuijk, F. Deconinck, M. Van Miert, M. Defrise, D. Townsend, and M. Wensveen "First Test Of A New High Resolution Positron Camera With Four Area Detectors", Proc. SPIE 1137, Science and Engineering of Medical Imaging, (18 October 1989); https://doi.org/10.1117/12.961736

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KEYWORDS

Sensors

Cameras

Positron emission tomography

Spatial resolution

3D image reconstruction

Reconstruction algorithms

Lead

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