A Feasibility Study of GAGG-GAPD Detector for Development of DEXA

A GAGG-GAPD detector module was proposed and developed for DEXA application and was characterized under various conditions. The proposed detector consists of GAGG and GAPD. The effect of kVp on energy spectra was assessed for different tube voltages in air condition. Also, the effect of the filter on dual energy Xray spectra was examined by using K-edge filter with different thickness. The mean photon energy and beam peak energy are increase linearly from 40 kVp to 80 kVp. The dual energy peaks were located around 32 keV and 65 keV and were considerably isolated. The DEXA phantom image for each steps were clearly resolved. These results demonstrate the feasibility of GAGG-GAPD detector allowing more potential merits than conventional CZT detector for DEXA application.