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A study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom
Tumor motion during radiation treatment on a helical tomotherapy unit may create problems due to interplay with motion of the multileaf collimator, gantry rotation, and patient couch translation through the gantry. This study evaluated this interplay effect for typical clinical parameters using a cy...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5714359/ https://www.ncbi.nlm.nih.gov/pubmed/23470931 http://dx.doi.org/10.1120/jacmp.v14i2.4022 |
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author | Klein, Michael Gaede, Stewart Yartsev, Slav |
author_facet | Klein, Michael Gaede, Stewart Yartsev, Slav |
author_sort | Klein, Michael |
collection | PubMed |
description | Tumor motion during radiation treatment on a helical tomotherapy unit may create problems due to interplay with motion of the multileaf collimator, gantry rotation, and patient couch translation through the gantry. This study evaluated this interplay effect for typical clinical parameters using a cylindrical phantom consisting of 1386 diode detectors placed on a respiratory motion platform. All combinations of radiation field widths (1, 2.5, and 5 cm) and gantry rotation periods (16, 30, and 60 s) were considered for sinusoidal motions with a period of 4 s and amplitudes of 5, 6, 7, 8, 9, and 10 mm, as well as real patient breathing pattern. Gamma comparisons with 2% dose difference and 2 mm distance to agreement and dose profiles were used for evaluation. The required motion margins were determined for each set of parameters. The required margin size increased with decreasing field width and increasing tumor motion amplitude, but was not affected by rotation period. The plans with the smallest field width of 1 cm have required motion margins approximately equal to the amplitude of motion ([Formula: see text]), while those with the largest field width of 5 cm had required motion margins approximately equal to 20% of the motion amplitude ([Formula: see text]). For tumor motion amplitudes below 6 mm and field widths above 1 cm, the required additional motion margins were very small, at a maximum of 2.5 mm for sinusoidal breathing patterns and 1.2 mm for the real patient breathing pattern. PACS numbers: 87.55.km, 87.55.Qr, 87.56.Fc |
format | Online Article Text |
id | pubmed-5714359 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-57143592018-04-02 A study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom Klein, Michael Gaede, Stewart Yartsev, Slav J Appl Clin Med Phys Radiation Oncology Physics Tumor motion during radiation treatment on a helical tomotherapy unit may create problems due to interplay with motion of the multileaf collimator, gantry rotation, and patient couch translation through the gantry. This study evaluated this interplay effect for typical clinical parameters using a cylindrical phantom consisting of 1386 diode detectors placed on a respiratory motion platform. All combinations of radiation field widths (1, 2.5, and 5 cm) and gantry rotation periods (16, 30, and 60 s) were considered for sinusoidal motions with a period of 4 s and amplitudes of 5, 6, 7, 8, 9, and 10 mm, as well as real patient breathing pattern. Gamma comparisons with 2% dose difference and 2 mm distance to agreement and dose profiles were used for evaluation. The required motion margins were determined for each set of parameters. The required margin size increased with decreasing field width and increasing tumor motion amplitude, but was not affected by rotation period. The plans with the smallest field width of 1 cm have required motion margins approximately equal to the amplitude of motion ([Formula: see text]), while those with the largest field width of 5 cm had required motion margins approximately equal to 20% of the motion amplitude ([Formula: see text]). For tumor motion amplitudes below 6 mm and field widths above 1 cm, the required additional motion margins were very small, at a maximum of 2.5 mm for sinusoidal breathing patterns and 1.2 mm for the real patient breathing pattern. PACS numbers: 87.55.km, 87.55.Qr, 87.56.Fc John Wiley and Sons Inc. 2013-03-04 /pmc/articles/PMC5714359/ /pubmed/23470931 http://dx.doi.org/10.1120/jacmp.v14i2.4022 Text en © 2013 The Authors. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/3.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Radiation Oncology Physics Klein, Michael Gaede, Stewart Yartsev, Slav A study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom |
title | A study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom |
title_full | A study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom |
title_fullStr | A study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom |
title_full_unstemmed | A study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom |
title_short | A study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom |
title_sort | study of longitudinal tumor motion in helical tomotherapy using a cylindrical phantom |
topic | Radiation Oncology Physics |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5714359/ https://www.ncbi.nlm.nih.gov/pubmed/23470931 http://dx.doi.org/10.1120/jacmp.v14i2.4022 |
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