Linear Arrays, which are made from single row of pixels, or slabs of scintillation crystals, are to be optically reflective and isolating.

Two Dimensional Arrays, which are arranged in an X-Y matrix, its assemblies are typically coupled with pixelated photodiodes, position-sensitive photomultiplier tubes(PSPMT) and silicone photomultipliers(SiPM). The most common application is in medical imaging scanners (PET, SPECT, CT), portal imaging, X-ray flash radiography and non-destructive te