Interface dose perturbation as a measure of megavoltage photon beam energy

Indra J. Das, Faiz M. Khan, Bruce J. Gerbi

Research output: Contribution to journalLetter

9 Scopus citations

Abstract

The description of the quality of a photon beam has usually been characterized by a single value such as the half value layer, the effective attenuation coefficient, the percent depth dose, and most recently by the ionization ratio (IR). Although the IR is simple and easy to measure, it lacks sensitivity at photon energies above 10 MV. This paper describes a method based on dose perturbation at an interface and defines the forward dose perturbation factor (FDPF) as a measure of beam quality. Comparisons between the two methods are given for photon energies ranging from 60Co to 24 MV. The results show that the FDPF method is more sensitive to spectral changes at photon energies above 10 MV than the IR.

Original languageEnglish (US)
Pages (from-to)78-81
Number of pages4
JournalMedical Physics
Volume15
Issue number1
DOIs
StatePublished - Jan 1988

Keywords

  • BEAM MONITORING
  • BEAM PROFILES
  • CALIBRATION
  • GAMMA DOSIMETRY
  • GAMMA RADIATION
  • PHOTON BEAMS
  • RADIOTHERAPY

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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