Variations in Depth-Dose Data Between Open and Wedge Fields for 4-MV X-Rays

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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 percent depth doses between the 2 types of fields indicate beam hardening by the wedge filter. The derivation of tissue-maximum ratios from central-axis percent depth was as valid for wedge as for open fields.

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