US Patent 9304211 Scintillation detector with active light guide

A scintillation detector array includes a scintillator array comprising a plurality of scintillator elements, a photodetector array comprising a plurality of photodetector elements, an active light guide separating the scintillator array from the photodetector array. The active light guide formed of a scintillator material having different emission properties than the plurality of scintillator elements.