Fig. 9From: High resolution detectors for whole-body PET scanners by using dual-ended readoutDOI ratio histograms of a middle crystal in the four detectors measured at different depths of 4-mm stepping size, a detector 1, b detector 2, c detector 3, and d detector 4. The depths measured for detectors 1 and 3 are 2, 6, 10, 14, and 18Â mm from one end. The depths measured for detectors 2 and 4 are 3, 7, 11, 15, 19, 13, and 27Â mm from one endBack to article page