Improvements in dose accuracy delivered with static-MLC IMRT on an integrated linear accelerator control system

Medical Physics
Ji LiHania A Al-Hallaq

Abstract

Dose accuracy has been shown to vary with dose per segment and dose rate when delivered with static multileaf collimator (SMLC) intensity modulated radiation therapy (IMRT) by Varian C-series MLC controllers. The authors investigated the impact of monitor units (MUs) per segment and dose rate on the dose delivery accuracy of SMLC-IMRT fields on a Varian TrueBeam linear accelerator (LINAC), which delivers dose and manages motion of all components using a single integrated controller. An SMLC sequence was created consisting of ten identical 10 × 10 cm(2) segments with identical MUs. Beam holding between segments was achieved by moving one out-of-field MLC leaf pair. Measurements were repeated for various combinations of MU/segment ranging from 1 to 40 and dose rates of 100-600 MU/min for a 6 MV photon beam (6X) and dose rates of 800-2400 MU/min for a 10 MV flattening-filter free photon (10XFFF) beam. All measurements were made with a Farmer (0.6 cm(3)) ionization chamber placed at the isocenter in a solid-water phantom at 10 cm depth. The measurements were performed on two Varian LINACs: C-series Trilogy and TrueBeam. Each sequence was delivered three times and the dose readings for the corresponding segments were averaged. The e...Continue Reading

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Citations

Jan 10, 2013·Medical Physics·Mark BangertUwe Oelfke
Dec 11, 2013·Medical Physics·Yuichi AkinoKazuhiko Ogawa
Mar 8, 2016·Zeitschrift für medizinische Physik·Yvonne DziermaChristian Rübe
Oct 3, 2015·Medical Physics·Tobias EckhauseJean M Moran
Dec 11, 2014·Journal of Applied Clinical Medical Physics·Christina E AgnewConor K McGarry
May 12, 2016·Journal of Applied Clinical Medical Physics·Long HuangPing Xia

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