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(a) Side and (b) top view diagrams demonstrating the five parameters that were varied in the conical slant-hole collimator simulations. h is the height of the collimator; t is the cone wall thickness; θ is the slant angle as measured from vertical; A is the annular area of uncovered detector surface between the cones; and k is a coefficient describing the outer thicknesses of the radiating wedge-shaped septa.
