The design of the detector and collimators for a hybrid scanner

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Abstract
The hybrid scanner is a scanning device in which a long crystal with 2 or more photomultiplier (PM) tubes acts as a .gamma. camera along the crystal axis; the device acts as a linear scanner in a direction perpendicular to the crystal axis. A detailed analsis of the intrinsic resolution and uniformity is given for a 2-PM-tube hybrid scanner (with 1 PM tube at each end) and the expressions derived should help in choosing the best crystal system. Collimation theory is discussed for the general hybrid scanner. Expressions and graphs are given to help in the design of a collimator with the best balance betwen the conflicting requirements of resolution, sensitivity, depth independence and freedom from artifacts (collimator holes may be seen in the image at high energy). Examples of practical collimators are given for energies of 80-140, 364, 511, 662 and 840 keV.

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