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Scientific Presentations at 2011 AAPM/COMP Meeting Highlight TrueBeam® and RapidArc® Radiotherapy Systems From Varian Medical Systems
Date:8/9/2011

imulated imaging, treatment planning, and treatment delivery using a moving phantom to verify that gated RapidArc can produce dose distributions that accurately conform to the three-dimensional shape of a targeted tumor even though dose delivery is continually adjusted to compensate for tumor motion during treatment. (6)
  • Three research teams reported on the Acuros XB dose calculation algorithm, which was added to Varian's Eclipse™ treatment planning software last year as a faster alternative to Monte Carlo algorithms for planning RapidArc and other complex treatments. A group from the M.D. Anderson Cancer Center in Houston reported on a head and neck cancer case that was planned using diverse calculation algorithms that were then compared.  They concluded that the Acuros XB algorithm makes it possible to complete calculations for a RapidArc treatment plan roughly three times faster than the AAA algorithm.(7) Another M. D. Anderson team used a phantom study to compare the dosimetric performance of Acuros XB with other treatment planning algorithms.  Acuros XB was found to be equivalent to the Monte Carlo (MC) algorithm and superior to the anisotropic analytical algorithm (AAA) and the collapsed-cone convolution (CCC) algorithm.(8)  And a group from the Istituto Oncologico della Svizzera Italiana (IOSI) in Bellinzona, Switzerland performed a treatment planning and phantom irradiation study to validate Acuros XB as a viable algorithm for planning RapidArc stereotactic treatments.(9)*

  • "Over 50 presentations and posters at this year's international meeting of medical physicists reported on clinical or scientific work using Varian technology," said Chris Toth, senior director of marketing for Varian's Oncology Systems business.  "Of those, 35 were based on our RapidArc radiotherapy technology, while another eleven looked at ways of using our TrueBeam system for image-guided radiotherapy and radiosurgery. 
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