title: Surface and percentage depth doses for secondary blocking using a multileaf collimator and cerrobend-alloy blocks.
abstract: Percentage depth doses from the surface to a depth of 30 cm have been measured for a number of square fields using 6 MV and 15 MV X-rays as part of the commissioning procedure for a commercially available MLC. Factors such as changing SSD, presence of a secondary blocking tray in the beam, and radiation transmission between the MLC leaves were investigated.
authors.affiliation: Radiation Oncology Department, Saint Louis University Health Sciences Center, MO 63110-0250, USA.
authors.forename: J
authors.initials: J
authors.lastname: Dawson
authors.forename: D
authors.initials: D
authors.lastname: Kahler
authors.forename: B
authors.initials: B
authors.lastname: McDonald
authors.forename: W
authors.initials: W
authors.lastname: Kopecky
authors.forename: J
authors.initials: J
authors.lastname: Gu
mesh_terms: D006801:Humans; D011829:Radiation Dosage; D011835:Radiation Protection / Q000379:methods*; D011880:Radiotherapy Planning, Computer-Assisted