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WGI prototype at NIRS (A) for combined PET and Compton imaging (B), along with its Compton imaging performance for the measurement of 22Na sources, emitting a positron, and a 1,274 keV photon (C). Corresponding simulation model (D) for optimization of the design [left: same design as (A), right: modified design for improved Compton efficiency] (Source: NIRS and LMU).
