Elimination of field size dependence of enhanced dynamic wedge factors

A. Sethi, L. B. Leybovich, N. Dogan, G. P. Glasgow

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Enhanced dynamic wedge factors (EDWF) are characterized by a strong field size dependence. In contrast to physical wedge factors, the EDWF decrease as the field size is increased: for 6 MV 60°wedge, the EDWF decreases by 50% when the field size is increased from 4 x 4 cm2 to 20 x 20 cm2. A method that eliminates the field size dependence of EDWF was developed and investigated in this work. In this method, the wedged field shape is determined by a multileaf collimator. The initial position of the moving Y jaw is determined by the field size and the stationary Y jaw is kept fixed at 10 cm for field sizes ≤20 cm in the wedged direction. For all other fields, the stationary Y jaw setting is determined by the field size. The modified method results in EDWF that are independent of field size, with no change in the wedge dose distribution when compared with the conventional use of EDW.

Original languageEnglish (US)
Pages (from-to)3359-3365
Number of pages7
JournalPhysics in Medicine and Biology
Volume45
Issue number11
DOIs
StatePublished - Nov 25 2000
Externally publishedYes

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

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