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The mean energy and the FWHM of the incident electron beam intensity distributions (assumed Gaussian and cylindrically symmetric) are derived by matching calculated percentage depth\u2010dose curves past the depth of maximum dose (within 1% of maximum dose) and off\u2010axis factors (within 2\u03c3 at 1% statistics or less) with measured data from the AAPM RTC TG\u201046 compilation. The off\u2010axis factors are found to be very sensitive to the mean energy of the electron beam, the FWHM of its intensity distribution, its angle of incidence, the dimensions of the upper opening of the primary collimator, the material of the flattening filter and its density. The off\u2010axis factors are relatively insensitive to the FWHM of the electron beam energy distribution, its divergence and the lateral dimensions of the target. The depth\u2010dose curves are sensitive to the electron beam energy, and to its energy distribution, but they show no sensitivity to the FWHM of the electron beam intensity distribution. The electron beam incident energy can be estimated within 0.2 MeV when matching either the measured off\u2010axis factors or the central\u2010axis depth\u2010dose curves when the calculated uncertainties are about 0.7% at the 1 \u03c3 level. The derived FWHM (\u00b10.1 mm) of the electron beam intensity distributions all fall within 1 mm of the manufacturer specifications except in one case where the difference is 1.2 mm.<\/jats:p>","DOI":"10.1118\/1.1446109","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T14:01:44Z","timestamp":1027692104000},"page":"379-390","source":"Crossref","is-referenced-by-count":229,"title":["Sensitivity of megavoltage photon beam Monte Carlo simulations to electron beam and other parameters"],"prefix":"10.1002","volume":"29","author":[{"given":"Daryoush","family":"Sheikh\u2010Bagheri","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D. W. 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Bortfeld (Springer\u2010Verlag Heidelberg 2000) pp. 464\u2013465.","DOI":"10.1007\/978-3-642-59758-9_174"},{"key":"e_1_2_1_20_1","doi-asserted-by":"crossref","unstructured":"J. V. Siebers P. J. Keall J. O. Kim and R. Mohan Performance benchmarks of the MCV Monte Carlo system inThe Use of Computers in Radiotherapy XIIIth International Conference Heidelberg edited by W. Schlegel and T. Bortfeld (Springer\u2010Verlag Heidelberg 2000) pp. 129\u2013131.","DOI":"10.1007\/978-3-642-59758-9_47"},{"key":"e_1_2_1_21_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.598959"},{"key":"e_1_2_1_22_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.1381551"},{"key":"e_1_2_1_23_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.599024"},{"key":"e_1_2_1_24_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.1290714"},{"key":"e_1_2_1_25_1","doi-asserted-by":"crossref","unstructured":"R. A. C. Siochi Requirements for Manufacturer Supplied Data for Monte Carlo Simulation: A BEAM Perspective Proceedings of the Fifteenth International Conference on the Applications of Accelerators in Research and Industry(The American Institute of Physics New York 1999) pp. 1060\u20131065.","DOI":"10.1063\/1.59100"},{"key":"e_1_2_1_26_1","doi-asserted-by":"publisher","DOI":"10.1088\/0031-9155\/34\/10\/008"},{"key":"e_1_2_1_27_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.597620"},{"key":"e_1_2_1_28_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.594663"},{"key":"e_1_2_1_29_1","doi-asserted-by":"publisher","DOI":"10.1088\/0031-9155\/30\/6\/008"},{"key":"e_1_2_1_30_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.597349"},{"key":"e_1_2_1_31_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.595822"},{"key":"e_1_2_1_32_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.597078"},{"key":"e_1_2_1_33_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.596760"},{"key":"e_1_2_1_34_1","doi-asserted-by":"publisher","DOI":"10.1016\/0360-3016(88)90447-6"},{"key":"e_1_2_1_35_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.598069"},{"key":"e_1_2_1_36_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.598249"},{"key":"e_1_2_1_37_1","unstructured":"J. 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