Fig. 4From: A time-based double-sided readout concept of 100 mm LYSO:Ce,Ca fibres for future axial TOF-PETDOI-dependent CTR and the conventionally determined head-on CTR (shown as dashed line) in a 20-mm LYSO:Ce,Ca fibre. The position furthest from the SiPM, i.e. the end of the crystal that is not attached to the SiPM, is defined as position 0 mm and increases towards the SiPM until the complete length of 20 mm is reached at the point of contact with the SiPMBack to article page