Arc-modulated radiation therapy based on linear models.

Journal Article

This paper reports an inverse arc-modulated radiation therapy planning technique based on linear models. It is implemented with a two-step procedure. First, fluence maps for 36 fixed-gantry beams are generated using a linear model-based intensity-modulated radiation therapy (IMRT) optimization algorithm. The 2D fluence maps are decomposed into 1D fluence profiles according to each leaf pair position. Second, a mixed integer linear model is used to construct the leaf motions of an arc delivery that reproduce the 1D fluence profile previously derived from the static gantry IMRT optimization. The multi-leaf collimator (MLC) sequence takes into account the starting and ending leaf positions in between the neighbouring apertures, such that the MLC segments of the entire treatment plan are deliverable in a continuous arc. Since both steps in the algorithm use linear models, implementation is simple and straightforward. Details of the algorithm are presented, and its conceptual correctness is verified with clinical cases representing prostate and head-and-neck treatments.

Full Text

Duke Authors

Cited Authors

  • Zhu, X; Thongphiew, D; McMahon, R; Li, T; Chankong, V; Yin, F-F; Wu, QJ

Published Date

  • July 7, 2010

Published In

Volume / Issue

  • 55 / 13

Start / End Page

  • 3873 - 3883

PubMed ID

  • 20571210

Electronic International Standard Serial Number (EISSN)

  • 1361-6560

Digital Object Identifier (DOI)

  • 10.1088/0031-9155/55/13/020

Language

  • eng

Conference Location

  • England