Showing papers by "Jeff D. Williamson published in 1978"
TL;DR: The differences in central-axis per cent depth doses between the two types of fields indicate beam hardening by the wedge filter, and implies that the derivation of tissue-maximum ratios from central- axis per cent Depth is as valid for wedge as for open fields.
Abstract: Central-axis depth-dose data for 4-MV x rays, including tissue-maximum ratios, were measured for wedge fields. Comparison with corresponding open-field data revealed differences in magnitude which increased with depth, field size, and wedge thickness. However, phantom scatter correction factors for the wedge fields differed less than 1% from corresponding open-field factors. The differences in central-axis per cent depth doses between the two types of fields indicate beam hardening by the wedge filter. This study also implies that the derivation of tissue-maximum ratios from central-axis per cent depth is as valid for wedge as for open fields.
24 citations