Abstract
A unified theoretical approach is presented for moving and stationaryscanners, together with experimental evidence which supports the theory. The lawsof variation of point sensitivity in air with position in the field of view are shown to besimilar for both the types of scanner. The "working region" is defined as that partof the field of view in which the point sensitivity in air is independent of position.For points within the working region, the scanning system behaves as though thehole-septum discontinuities in the collimator were absent and as if the totalresponsiveness were "smeared out" uniformly over the detection plane. The shapeof the working region for a circular multi-parallel-hole camera collimator is a "rightcircular cone". For a rectilinear scanner the working region for a square scan areais a "regular square pyramid"; that for a rectangular scan area is extended along thelonger side to an extent equal to the difference of two sides - geometrically it is a"laterally tapering wedge" resting on the rectangular face.
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