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Analytical Consideration of Surface Dose and Kerma for Megavoltage Photon Beams in Clinical Radiation Therapy
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 Title & Authors
Analytical Consideration of Surface Dose and Kerma for Megavoltage Photon Beams in Clinical Radiation Therapy
Birgani, Mohammad Javad Tahmasebi; Behrooz, Mohammad Ali; Razmjoo, Sasan; Zabihzadeh, Mansour; Fatahiasl, Jafar; Maskni, Reza; Abdalvand, Neda; Asgarian, Zeynab; Shamsi, Azin;
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Background: In radiation therapy, estimation of surface doses is clinically important. This study aimed to obtain an analytical relationship to determine the skin surface dose, kerma and the depth of maximum dose, with energies of 6 and 18 megavoltage (MV). Materials and Methods: To obtain the dose on the surface of skin, using the relationship between dose and kerma and solving differential equations governing the two quantities, a general relationship of dose changes relative to the depth was obtained. By dosimetry all the standard square fields of to , an equation similar to response to differential equations of the dose and kerma were fitted on the measurements for any field size and energy. Applying two conditions: a) equality of the area under dose distribution and kerma changes in versus depth in 6 and 18 MV, b) equality of the kerma and dose at $x
Dosimetry;skin surface dose;kerma;percentage depth dose;buildup region;
 Cited by
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