Abstract
Families of central axis tissue-air ratio (TAR) curves as a function of area at depth, divided by perimeter (A/P) for fixed values of depth, were plotted and tabulated using the original data of Gupta and Cunningham for square fields. By means of an isodose plotter, values of TAR were experimentally obtained up to depths of 30 cm for mantle field, and up to 10 cm for other irregularly shaped fields. These were compared with the tabulated values in order to evaluate the validity of square fieldA/P's as a convenient parameter for the routine determination of central axis TAR values. Rectangular, L, pentagonal and special mantle shapes, which are all frequently encountered, were used. In all cases, the use of A/P as the determining criterion for values of TAR resulted in less than 3% difference from the tabulated square field values.
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