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Surface and percentage depth doses for secondary blocking using a multileaf collimator and cerrobend-alloy blocks
J Dawson1, D Kahler, B McDonald
1Radiation Oncology Department, Saint Louis University Health Sciences Center, MO 63110-0250, USA.
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.