Variations in depth-dose data between open and wedge fields for 4-MV X-rays

W., F. M. Khan, W., J. Williamson

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


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.

Original languageEnglish
Pages (from-to)789-792
Number of pages4
Issue number3
StatePublished - 1978


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