Med Phys 2015 Sep;42(9):5404-9
Department of Medical Physics, Tom Baker Cancer Centre, Calgary, Alberta T2N 4N2, Canada; Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada; and Department of Oncology, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
Purpose: Respiratory margins for partial breast irradiation (PBI) have been largely based on geometric observations, which may overestimate the margin required for dosimetric coverage. In this study, dosimetric population-based respiratory margins and margin formulas for external beam partial breast irradiation are determined.
Methods: Volunteer respiratory data and anterior-posterior (AP) dose profiles from clinical treatment plans of 28 3D conformal radiotherapy (3DCRT) PBI patient plans were used to determine population-based respiratory margins. Read More