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  • Title: Comparison of the cobalt-60 photon beam dose distributions corrected by three shift-factors for oblique incidence.
    Author: Iwasaki A, Ishito T.
    Journal: Med Phys; 1980; 7(3):216-21. PubMed ID: 6771510.
    Abstract:
    A new factor for shifting isodoes curves for oblique Co-60 photon beams has been deduced. Like the two other known factors, this shift factor depends on the source-to-surface distance (SSD), the depth dose (D) and the derivative of D with depth. A comparison of corrected dose distributions has been made by using the three shift factors for the 15 X 15-cm2 field incident on a surface at 45 degrees. In general, the corrected dose distributions given by the new shift factor show the best agreement with the measured depth dose data.
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