Abstract
Over the last 3 years in-beam PET has proven its capability of quality assurance in carbon ion tumour therapy at the pilot project of cancer therapy at the Gesellschaft fur Schwerionenforschung (GSI) in Darmstadt, Germany. Here, the authors investigate the possibility of using LSO as the scintillation material for the next generation of in-beam PET cameras. They address the issue of background coincidences arising from the natural radioactivity of LSO. Because the true count rate measured with a BGO-based dual-head positron camera (total sensitive area of each head 21/spl times/42 cm/sup 2/) during the cancer treatment averages at only 100 coincidences/s the authors studied the influence of the LSO background on realistic in-beam PET images.
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