PMID: 11929009Apr 4, 2002Paper

A quality and efficiency analysis of the IMFAST segmentation algorithm in head and neck "step & shoot" IMRT treatments

Medical Physics
Larry D PotterAlfredo C Siochi

Abstract

The performance of segmentation algorithms used in IMFAST for "step & shoot" IMRT treatment delivery is evaluated for three head and neck clinical treatments of different optimization objectives. The segmentation uses the intensity maps generated by the in-house TPS PLANUNC using the index-dose minimization algorithm. The dose optimization objectives include PTV dose uniformity and dose volume histogram-specified critical structure sparing. The optimized continuous intensity maps were truncated into five and ten intensity levels and exported to IMFAST for MLC segments optimization. The MLC segments were imported back to PLUNC for dose optimization quality calculation. The five basic segmentation algorithms included in IMFAST were evaluated alone and in combination with either tongue and groove/match line correction or fluence correction or both. Two criteria were used in the evaluation: treatment efficiency represented by the total number of MLC segments and optimization quality represented by a clinically relevant optimization quality factor. We found that the treatment efficiency depends first on the number of intensity levels used in the intensity map and second the segmentation technique used. The standard optimal segmentat...Continue Reading

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Citations

Mar 5, 2004·Australasian Physical & Engineering Sciences in Medicine·P TangboonduangjitP Metcalfe
Dec 4, 2003·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Bram van AsselenCornelis P J Raaijmakers
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May 6, 2004·Medical Physics·Shuang LuanChad L Lee
Aug 22, 2008·Journal of Applied Clinical Medical Physics·Bodo Reitz, Moyed Miften
Jan 18, 2005·Medical Physics·R Alfredo C Siochi
Jan 24, 2003·Physics in Medicine and Biology·Dietmar Georg, Bernhard Kroupa
Mar 9, 2005·Journal of Applied Clinical Medical Physics·Sha X ChangJulian G Rosenman

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