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Calculated geometric efficiency as a function of collimator resolution, hole length, and hole shape. A lead collimator (μ=26.32 cm−1, 140 keV) was assumed, with a conventional septal penetration of β=0.05. Two subcentimeter resolutions were examined. The distances from the source to the collimator surface are within the range necessary for dual-head MBI systems: (a) b=3 cm and (b) b=6 cm.
