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Schematic axial drawings of (a)—(e) the collimator locations for the considered partial collimation schemes and (f) for the fully 3-D mode without any collimation. Note that the collimator arrangement for (e) 2.9-D with septa only between axial detector blocks corresponds to that used in [17]. Dimensions for these systems are given in Table I. (a) 2.1-D. (b) 2.3-D. (c) 2.5-D. (d) 2.7-D. (e) 2.9-D. (f) 3-D.
