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Merck

Development of a BaF2/TMAE PET system.

Medical progress through technology (1991-01-01)
C W van Eijk, R W Hollander, B Fischer, K J Leliveld
ABSTRACT

A detector has been developed for position sensitive registration of annihilation radiation. The 511 keV gamma rays are detected in a set of BaF2 scintillation crystals coupled to low pressure TMAE-filled photosensitive multi wire chambers. In a first experimental detector with two BaF2 crystals we obtained a detection efficiency for 511 keV quanta of 42%. The position resolution is 5 mm and the time resolution is 4 ns. At present a circular detector for three BaF2 crystals with a diameter of 28 cm, each with a thickness of 8 mm, is under construction. Position sensitivity is obtained by means of delayline read out of cathode wires. Detectors of this type can be used as building blocks for a PET system. We are performing simulations of a system consisting of six rectangular detectors in a hexagonal composition. Results are given and a discussion of further innovative developments is presented.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Barium fluoride, precipitated, 99.95% trace metals basis
Sigma-Aldrich
Barium fluoride, 99.99% trace metals basis
Sigma-Aldrich
Barium fluoride, powder, 98%