Optimizing the Performance of a PET Detector using Discrete GSO Crystals on a Continuous Lightguide

.A-' 0 zn 40 6n so 100 izn 140 narrow Light Response Function (LRF) with good cryslal CllRnncl no. Figure 1: Measured elicrgy spectrum for a singlc 4 x 4 x 10 mm3 GSO crystal at 5 1 I keV. Thc trigger threshold is set at 40% of the peak value. by extending the lightguide to 2.3 cm in thickness, hut with 0.5cm slols cut in its front surface, which results in reduced tails of the LRF. The slotted lightguide also minimizes the spatial dependence of even1 positioning on different depths ol' interaction or the gamma ray. Experiments are in general agreement with the simulations. The good spatial resolution and narrow LRF of such a detector will result in high perforinance Cor a PET scanner which is based on the OS0 detcctor.