Wedge factors: dependence on depth and field size.
basic_science · Level V
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Abstract
Wedge factor (WF) variation with field size and depth has been analysed for 6 and 15 MV X-ray beams. The measured field size effect is 1.4% in the worst case, whereas the WF shows a linear dependence with depth giving a maximum variation of 0.22%/cm (60 degrees wedge, 6 MV beam). An empirical correction for WF depth dependence on wedge thickness is proposed.
Medical subject headings
- Radiotherapy Dosage
- Radiotherapy, High-Energy