The impact of leaf width and plan complexity on DMLC tracking of prostate intensity modulated arc therapy

Tobias Pommer; Marianne Falk; Per Rugaard Poulsen; Paul J Keall; Ricky T O'Brien; Per Munck Af Rosenschöld

doi:10.1118/1.4824434

The impact of leaf width and plan complexity on DMLC tracking of prostate intensity modulated arc therapy

Tobias Pommer, Marianne Falk, Per Rugaard Poulsen, Paul J Keall, Ricky T O'Brien, Per Munck Af Rosenschöld

9 Citations (Scopus)

Abstract

Purpose: Intensity modulated arc therapy (IMAT) is commonly used to treat prostate cancer. The purpose of this study was to evaluate the impact of leaf width and plan complexity on dynamic multileaf collimator (DMLC) tracking for prostate motion management during IMAT treatments.Methods: Prostate IMAT plans were delivered with either a high-definition MLC (HDMLC) or a Millennium MLC (M-MLC) (0.25 and 0.50 cm central leaf width, respectively), with and without DMLC tracking, to a dosimetric phantom that reproduced four prostate motion traces. The plan complexity was varied by applying leaf position constraints during plan optimization. A subset of the M-MLC plans was converted for delivery with the HDMLC, isolating the effect of the different leaf widths. The gamma index was used for evaluation. Tracking errors caused by target localization, leaf fitting, and leaf adjustment were analyzed.Results: The gamma pass rate was significantly improved with DMLC tracking compared to no tracking (p

Original language	English
Journal	Medical Physics
Volume	40
Issue number	11
Pages (from-to)	e 111717
ISSN	0094-2405
DOIs	https://doi.org/10.1118/1.4824434
Publication status	Published - Nov 2013

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title = "The impact of leaf width and plan complexity on DMLC tracking of prostate intensity modulated arc therapy",

abstract = "Purpose: Intensity modulated arc therapy (IMAT) is commonly used to treat prostate cancer. The purpose of this study was to evaluate the impact of leaf width and plan complexity on dynamic multileaf collimator (DMLC) tracking for prostate motion management during IMAT treatments.Methods: Prostate IMAT plans were delivered with either a high-definition MLC (HDMLC) or a Millennium MLC (M-MLC) (0.25 and 0.50 cm central leaf width, respectively), with and without DMLC tracking, to a dosimetric phantom that reproduced four prostate motion traces. The plan complexity was varied by applying leaf position constraints during plan optimization. A subset of the M-MLC plans was converted for delivery with the HDMLC, isolating the effect of the different leaf widths. The gamma index was used for evaluation. Tracking errors caused by target localization, leaf fitting, and leaf adjustment were analyzed.Results: The gamma pass rate was significantly improved with DMLC tracking compared to no tracking (p ",

author = "Tobias Pommer and Marianne Falk and Poulsen, \{Per Rugaard\} and Keall, \{Paul J\} and O'Brien, \{Ricky T\} and \{Munck Af Rosensch{\"o}ld\}, Per",

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T1 - The impact of leaf width and plan complexity on DMLC tracking of prostate intensity modulated arc therapy

AU - Pommer, Tobias

AU - Falk, Marianne

AU - Poulsen, Per Rugaard

AU - Keall, Paul J

AU - O'Brien, Ricky T

AU - Munck Af Rosenschöld, Per

PY - 2013/11

Y1 - 2013/11

N2 - Purpose: Intensity modulated arc therapy (IMAT) is commonly used to treat prostate cancer. The purpose of this study was to evaluate the impact of leaf width and plan complexity on dynamic multileaf collimator (DMLC) tracking for prostate motion management during IMAT treatments.Methods: Prostate IMAT plans were delivered with either a high-definition MLC (HDMLC) or a Millennium MLC (M-MLC) (0.25 and 0.50 cm central leaf width, respectively), with and without DMLC tracking, to a dosimetric phantom that reproduced four prostate motion traces. The plan complexity was varied by applying leaf position constraints during plan optimization. A subset of the M-MLC plans was converted for delivery with the HDMLC, isolating the effect of the different leaf widths. The gamma index was used for evaluation. Tracking errors caused by target localization, leaf fitting, and leaf adjustment were analyzed.Results: The gamma pass rate was significantly improved with DMLC tracking compared to no tracking (p

AB - Purpose: Intensity modulated arc therapy (IMAT) is commonly used to treat prostate cancer. The purpose of this study was to evaluate the impact of leaf width and plan complexity on dynamic multileaf collimator (DMLC) tracking for prostate motion management during IMAT treatments.Methods: Prostate IMAT plans were delivered with either a high-definition MLC (HDMLC) or a Millennium MLC (M-MLC) (0.25 and 0.50 cm central leaf width, respectively), with and without DMLC tracking, to a dosimetric phantom that reproduced four prostate motion traces. The plan complexity was varied by applying leaf position constraints during plan optimization. A subset of the M-MLC plans was converted for delivery with the HDMLC, isolating the effect of the different leaf widths. The gamma index was used for evaluation. Tracking errors caused by target localization, leaf fitting, and leaf adjustment were analyzed.Results: The gamma pass rate was significantly improved with DMLC tracking compared to no tracking (p

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SP - e 111717

JO - Medical Physics

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The impact of leaf width and plan complexity on DMLC tracking of prostate intensity modulated arc therapy

Abstract

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