Dosimetry of asymmetric x ray collimators

F. M. Khan, B. J. Gerbi, F. C. Deibel

Research output: Contribution to journalLetterpeer-review

82 Scopus citations

Abstract

We have studied the dosimetry of an independent jaw system (provided with the Varian Clinac 2500) using ionometric measurements performed both in air and in a water phantom. Our study shows that the effect of the independent jaw on the dose distribution is similar to that of secondary blocking except for changes produced in the collimator scatter. A system of dose calculation was developed which takes into account the changes in the collimator scatter as well as in the isodose distribution. A method is described to correctly generate isodose curves for fields shaped by an independent jaw using a modified AECL TP11 treatment planning system. The primary modification in the program consists of correcting the zero area tissue–maximum ratios for the off axis variation in beam quality.

Original languageEnglish (US)
Pages (from-to)936-941
Number of pages6
JournalMedical Physics
Volume13
Issue number6
DOIs
StatePublished - Nov 1986

Keywords

  • 87.53.1
  • 87.54.2
  • AIR
  • ASYMMETRY
  • COLLIMATORS
  • ISODOSE CURVES
  • PHANTOMS
  • WATER
  • X-RAY DOSIMETRY
  • X-RAY EQUIPMENT

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