Electron arc therapy: Beam data requirements and treatment planning

K. S. Lam, W. C. Lam, M. J. O'Neill, D. J. Lee, E. Zinreich

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


In electron are therapy a long narrow beam defined by a secondary collimator is used to sweep across the treatment area of the patient. Central axis percentage depth doses and off-axis ratios measured with such a collimator show variations with the source-to-surface distance (SSD). Errors may be introduced into isodose distributions calculated with the effective SSD method when beam data measured at a fixed SSD are used. A treatment planning algorithm using beam data measured at two SSDs to allow an interpolation and extrapolation procedure to account for SSD variations has been implemented. For calculations in off-axis planes, off-axis ratios normal to the plane of rotation are also required. Results of the calculations were checked with film dosimetry measurements and found to be in good agreement.

Original languageEnglish (US)
Pages (from-to)379-383
Number of pages5
JournalClinical Radiology
Issue number4
StatePublished - Jul 1987

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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