Abstract
Temperature effects on positron camera equipment may cause time dependent sensitivity variations, thus resulting in loss of quantification accuracy. These variations are mostly due to a temperature dependent response of scintillator crystals and photomultiplier tubes (PMT). With two different scintillators mounted on the same PMT, these effects will even more accentuate the problem. This study shows that the energy discriminator settings should not be too close to the full energy peak. That the decay constants decreases differently with increased temperature thereby causing a decreased true to random coincidence ratio for a mixed crystal combination, seems not to be a problem.
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