  In gamma ray imaging, a scintillation crystal is typically used to convert
the gamma radiation into visible light. Photosensors are used to transform this
light into measurable signals. Several types of photosensors are currently in
use depending on the application, most known are Position Sensitive
Photomultiplier Tubes (PSPMT) or arrays of Silicon Photomultipliers (SiPMs).
There have been investigations towards reducing the number of output signals
from those photosensors in order to decrease system costs and complexity
without impacting system performance. We propose here two different reduction
schemes without degradation of the detector performance, keeping a good
spatial, energy and timing resolution, specially well suited for monolithic
scintillation crystals based detectors. We have carried out comparative results
that will be shown.
