Volumetric modulated Arc therapy (VMAT) treatment planning for superficial tumors

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
Albert S ZacariasMichael D Mills

Abstract

The physician's planning objective is often a uniform dose distribution throughout the planning target volume (PTV), including superficial PTVs on or near the surface of a patient's body. Varian's Eclipse treatment planning system uses a progressive resolution optimizer (PRO), version 8.2.23, for RapidArc dynamic multileaf collimator volumetric modulated arc therapy planning. Because the PRO is a fast optimizer, optimization convergence errors (OCEs) produce dose nonuniformity in the superficial area of the PTV. We present a postsurgical cranial case demonstrating the recursive method our clinic uses to produce RapidArc treatment plans. The initial RapidArc treatment plan generated using one 360 degrees arc resulted in substantial dose nonuniformity in the superficial section of the PTV. We demonstrate the use of multiple arcs to produce improved dose uniformity in this region. We also compare the results of this superficial dose compensation method to the results of a recursive method of dose correction that we developed in-house to correct optimization convergence errors in static intensity-modulated radiation therapy treatment plans. The results show that up to 4 arcs may be necessary to provide uniform dose to the surface o...Continue Reading

References

Feb 19, 2002·Physics in Medicine and Biology·Robert JerajJeffrey V Siebers
Sep 2, 2008·Physics in Medicine and Biology·K BushS Zavgorodni
Nov 27, 2008·Physics in Medicine and Biology·I M GagneW A Beckham
Nov 26, 2009·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Albert S ZacariasMichael D Mills

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Citations

Aug 21, 2012·International Journal of Radiation Oncology, Biology, Physics·Enzhuo M QuanXiaodong Zhang
Oct 10, 2012·Journal of Medical Imaging and Radiation Oncology·Andrea MichalskiMarianne Rinks
Jun 19, 2012·International Journal of Radiation Oncology, Biology, Physics·Enzhuo M QuanXiaodong Zhang
Jun 4, 2014·Journal of Applied Clinical Medical Physics·Pan MaLuhua Wang
May 26, 2012·Cambridge Quarterly of Healthcare Ethics : CQ : the International Journal of Healthcare Ethics Committees·Barry Lyons
Feb 19, 2011·Journal of Applied Clinical Medical Physics·David JollyJuergen Meyer
Mar 3, 2011·Physics in Medicine and Biology·Bill J SalterPrema Rassiah-Szegedi

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