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Incorporating leaf transmission and head scatter corrections into step-and-shoot leaf sequences for IMRT by Yong Yang; Lei Xing is a Medicine article available to read on EtoBox.

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## Purpose: Leaf transmission and head scatter are two important factors that influence intensity-modulated radiation therapy (imrt) delivery and should be correctly taken into account when generating multileaf collimator (mlc) sequences. significant discrepancies between the desired and delivered intensity profiles could otherwise result. the purpose of this article is to propose a reliable algorithm to minimize the dosimetric effects caused by the two factors in step-and-shoot mode. ## Materials and methods: The goal of the algorithm is to minimize the difference between the desired fluence map and the fluence map actually delivered. for this purpose, an error function, defined as the least-square difference between the desired and the delivered fluence maps, is introduced. the effects of transmission and head scatter are minimized by adjusting the fractional monitor units (mus) in the initial mlc sequences, created by using the desired fluence map without inclusion of the contributions from the two factors. computationally, a downhill simplex optimization method is used to minimize the error function with respect to the fractional mus. a three-source model is used to evaluate th

Who reads Incorporating leaf transmission and head scatter corrections into step-and-shoot leaf sequences for IMRT?

Author

Yong Yang; Lei Xing

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0360-3016)

Published

2003

Language

EN

Field

Medicine (Health Sciences)