High-dose areas are unintentionally created as a result of gap shifts when the prescribed dose in the two adjacent areas are different.

Journal Article (Journal Article)

A large number of methods have been described for matching adjacent fields to prevent over- or underdosage at a field junction. Most authors recommend that the location of field junctions be shifted to different locations during the course of the treatment in an effort to "smear out" any dose inhomogeneity regardless of which field matching technique is used. This report focuses on the considerable variation in dose that can occur when the dose in the two adjacent treatment areas is different at the time of the gap shift. In a typical cranio-spinal treatment we found a 16% dose increase over the prescribed central axis dose.

Full Text

Duke Authors

Cited Authors

  • Bentel, GC; Halperin, EC

Published Date

  • December 1990

Published In

Volume / Issue

  • 15 / 4

Start / End Page

  • 179 - 183

PubMed ID

  • 2073330

International Standard Serial Number (ISSN)

  • 0958-3947

Digital Object Identifier (DOI)

  • 10.1016/0958-3947(90)90004-2


  • eng

Conference Location

  • United States