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An equivalent-square formula for head-scatter factors
1Department of Radiation Oncology, Roger Williams Cancer Center, Brown University Providence, Rhode Island 02908.
Medical Physics
|May 1, 1993
Abstract:
A simple formula is evaluated for calculating the equivalent square collimator setting that gives the same headscatter factor as a given rectangular field. The expression requires that one parameter is determined experimentally. It is found that one single value of this parameter can be used for the six x-ray beams studied (two accelerators, two energies, with and without wedge).