PMID: 2509864Sep 1, 1989Paper

Electron dose rate and photon contamination in electron arc therapy

Medical Physics
M PlaC Pla

Abstract

The electron dose rate at the depth of dose maximum dmax and the photon contamination are discussed as a function of several parameters of the rotational electron beam. A pseudoarc technique with an angular increment of 10 degrees and a constant number of monitor units per each stationary electron field was used in our experiments. The electron dose rate is defined as the electron dose at a given point in phantom divided by the number of monitor units given for any one stationary electron beam. For a given depth of isocenter di the electron dose rates at dmax are linearly dependent on the nominal field width w, while for a given w the dose rates are inversely proportional to di. The dose rates for rotational electron beams with different di are related through the inverse square law provided that the two beams have (di,w) combinations which give the same characteristic angle beta. The photon dose at the isocenter depends on the arc angle alpha, field width w, and isocenter depth di. For constant w and di the photon dose at isocenter is proportional to alpha, for constant alpha and w it is proportional to di, and for constant alpha and di it is inversely proportional to w. The w and di dependence implies that for the same alpha ...Continue Reading

Citations

Jul 1, 1997·International Journal of Radiation Oncology, Biology, Physics·G A SandisonJ Morphis
May 7, 2010·Medical Physics·James C L Chow, Runqing Jiang
Mar 1, 1993·The British Journal of Radiology·M R McKenzieE B Podgorsak
Jun 1, 1991·International Journal of Radiation Oncology, Biology, Physics·M PlaJ Guerra
Jan 1, 1997·Medical Physics·M Olivares-PlaC Pla
Apr 1, 1997·Medical Physics·B LachanceJ Pouliot
Jun 23, 2006·Physics in Medicine and Biology·Kenneth R Hogstrom, Peter R Almond

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