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SPECT electronic collimation resolution enhancement using chi-square minimizationDurkee, J W; Antich, P P; Tsyganov, E N; Constantinescu, A; Fernando, J L; Kulkarni, P V; Smith, B J; Arbique, G M; Lewis, M A; Nguyen, T; Raheja, A; Thambi, G; Parkey, R W · Physics in Medicine and Biology · 1998