title: Field equivalence for clinical electron beams.
abstract: The concept of field equivalence for electron beams is examined using a pencil beam theory applied to circular fields. It is shown that a circular field can be found for a field of any size, shape and energy for which the depth dose distribution is approximately equivalent. The usefulness of the concept in clinical dosimetry is discussed.
authors.affiliation: Department of Radiation Oncology, Fairview University Medical Center, Minneapolis, MN 55455, USA.
authors.forename: F M
authors.initials: FM
authors.lastname: Khan
authors.forename: P D
authors.initials: PD
authors.lastname: Higgins
mesh_terms: D004583:Electrons / Q000627:therapeutic use*; D008962:Models, Theoretical; D016011:Normal Distribution; D010315:Particle Accelerators / Q000295:instrumentation; D011874:Radiometry / Q000379:methods*; D012542:Scattering, Radiation