The omni wedge: A method to produce wedged fields at arbitrary orientations

B. D. Milliken, R. J. Hamilton, S. J. Rubin

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

A method to produce wedged fields at any orientation relative to the collimator is described. The wedged field is generated by combining two appropriately weighted orthogonal wedged field segments at fixed collimator and gantry positions. The method requires only that wedged fields can be produced in orthogonal directions without rotating the collimator, such as is commonly provided on most radiation therapy accelerators by sets of standard and rotated wedges. Expressions are derived relating the effective wedge angle and orientation to the weighting and wedge angles of the orthogonal wedged field segments. This technique will be important when using multileaf collimator field shaping for which collimator rotation is dictated by target or critical structure shape and orientation. The term omni wedge is introduced to describe this technique.

Original languageEnglish (US)
Pages (from-to)337-342
Number of pages6
JournalMedical physics
Volume23
Issue number3
DOIs
StatePublished - Jan 1 1996
Externally publishedYes

Keywords

  • conformal therapy
  • multileaf collimator
  • omni wedge
  • wedge

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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