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Dwell position inaccuracy in the Varian GammaMed HDR ring applicator

Varian has issued two Product Notification Letters warning of known inaccuracies in dwell positions for their GammaMed HDR ring applicator. This inaccuracy was measured for two sets of applicators. Autoexposed radiographs were taken of the HDR source at different dwell positions and analyzed per Var...

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Detalles Bibliográficos
Autores principales: Stern, Robin L., Liu, Tianxiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5720406/
https://www.ncbi.nlm.nih.gov/pubmed/21081871
http://dx.doi.org/10.1120/jacmp.v11i4.3158
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author Stern, Robin L.
Liu, Tianxiao
author_facet Stern, Robin L.
Liu, Tianxiao
author_sort Stern, Robin L.
collection PubMed
description Varian has issued two Product Notification Letters warning of known inaccuracies in dwell positions for their GammaMed HDR ring applicator. This inaccuracy was measured for two sets of applicators. Autoexposed radiographs were taken of the HDR source at different dwell positions and analyzed per Varian recommendations using tools within the BrachyVision treatment planning program. Comparison between programmed and actual dwell positions showed the actual positions shifted distally by an average of 0.34 cm (0.17 cm–0.59 cm) across all positions in all rings. A correction method was developed and tested. During planning, the tip of the ring was extrapolated distally beyond its actual position in the patient image set and a proximal offset of the same distance was applied to the dwell positions. A global shift of 0.3 mm corrected all but the most proximal actual dwell position to within [Formula: see text] mm of the planned position. PACS number: 87.53Jw, 87.56Da
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spelling pubmed-57204062018-04-02 Dwell position inaccuracy in the Varian GammaMed HDR ring applicator Stern, Robin L. Liu, Tianxiao J Appl Clin Med Phys Technical Notes Varian has issued two Product Notification Letters warning of known inaccuracies in dwell positions for their GammaMed HDR ring applicator. This inaccuracy was measured for two sets of applicators. Autoexposed radiographs were taken of the HDR source at different dwell positions and analyzed per Varian recommendations using tools within the BrachyVision treatment planning program. Comparison between programmed and actual dwell positions showed the actual positions shifted distally by an average of 0.34 cm (0.17 cm–0.59 cm) across all positions in all rings. A correction method was developed and tested. During planning, the tip of the ring was extrapolated distally beyond its actual position in the patient image set and a proximal offset of the same distance was applied to the dwell positions. A global shift of 0.3 mm corrected all but the most proximal actual dwell position to within [Formula: see text] mm of the planned position. PACS number: 87.53Jw, 87.56Da John Wiley and Sons Inc. 2010-09-07 /pmc/articles/PMC5720406/ /pubmed/21081871 http://dx.doi.org/10.1120/jacmp.v11i4.3158 Text en © 2010 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 Technical Notes
Stern, Robin L.
Liu, Tianxiao
Dwell position inaccuracy in the Varian GammaMed HDR ring applicator
title Dwell position inaccuracy in the Varian GammaMed HDR ring applicator
title_full Dwell position inaccuracy in the Varian GammaMed HDR ring applicator
title_fullStr Dwell position inaccuracy in the Varian GammaMed HDR ring applicator
title_full_unstemmed Dwell position inaccuracy in the Varian GammaMed HDR ring applicator
title_short Dwell position inaccuracy in the Varian GammaMed HDR ring applicator
title_sort dwell position inaccuracy in the varian gammamed hdr ring applicator
topic Technical Notes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5720406/
https://www.ncbi.nlm.nih.gov/pubmed/21081871
http://dx.doi.org/10.1120/jacmp.v11i4.3158
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