Inhomogeneity correction and the analytic anisotropic algorithm.

Journal of Applied Clinical Medical Physics
Don Robinson

Abstract

The ability of the analytic anisotropic algorithm (AAA), a superposition- convolution algorithm implemented in the Eclipse (Varian Medical Systems, Palo Alto, CA) treatment planning system (TPS), to accurately account for the presence of inhomogeneities in simple geometries is examined. The goal of 2% accuracy, as set out by the American Association of Physicists in Medicine Task Group 65, serves as a useful benchmark against which to evaluate the inhomogeneity correction capabilities of this treatment planning algorithm. A planar geometry phantom consisting of upper and lower layers of Solid Water (Gammex rmi, Middleton, WI) separated by a heterogeneity region of variable thickness, is modeled within the Eclipse TPS. Results obtained with the AAA are compared with experimental measurements. Seven different materials, spanning the range from air to aluminum, constitute the inhomogeneity layer. In general, the AAA overpredicts dose beyond low-density regions and underpredicts dose distal to volumes of high density. In many cases, the deviation between the AAA and experimental results exceeds the Task Group 65 target of 2%. The source of these deviations appears to arise from an inability of the AAA to correctly account for alter...Continue Reading

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Citations

Jan 16, 2014·Journal of Applied Clinical Medical Physics·Suresh RanaChihYao Cheng
Jan 16, 2014·Journal of Applied Clinical Medical Physics·Danielle W LackMichael Snyder
Mar 24, 2016·Australasian Physical & Engineering Sciences in Medicine·Jackson M ZifodyaWen-Long Hsieh
Jul 29, 2015·Journal of Applied Clinical Medical Physics·Ning WenM Salim Siddiqui
Sep 11, 2014·Journal of Applied Clinical Medical Physics·Saskia PetillionFrank Van den Heuvel
Jul 1, 2020·Physics in Medicine and Biology·Anatoly B RozenfeldVladimir Feygelman
Apr 27, 2016·Australasian Physical & Engineering Sciences in Medicine·Jiahua Zhu, Scott N Penfold
Sep 21, 2011·Medical Physics·Chin Loon OngWilko F A R Verbakel
Jan 14, 2021·Biomedical Physics & Engineering Express·Baljeet SeniwalTelma C F Fonseca
Apr 30, 2021·Technology in Cancer Research & Treatment·Lingtong HouShengyu Yao
Jun 7, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Gisell Ruiz BoisetSimone Coutinho Cardoso
Nov 16, 2010·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Chin Loon OngSuresh Senan

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Software Mentioned

Eclipse
AAA
Eclipse TPS
Varian Eclipse XiO

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