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Effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy

Endorectal balloons (ERBs) are routinely used in prostate proton radiation therapy to immobilize the prostate and spare the rectal wall. Rectal gas can distend the rectum and displace the prostate even in the presence of ERBs. The purpose of this work was to quantify the effects an ERB with a passiv...

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Autores principales: Wootton, Landon S., Kudchadker, Rajat J., Beddar, A. Sam, Lee, Andrew K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5718230/
https://www.ncbi.nlm.nih.gov/pubmed/22955660
http://dx.doi.org/10.1120/jacmp.v13i5.3945
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author Wootton, Landon S.
Kudchadker, Rajat J.
Beddar, A. Sam
Lee, Andrew K.
author_facet Wootton, Landon S.
Kudchadker, Rajat J.
Beddar, A. Sam
Lee, Andrew K.
author_sort Wootton, Landon S.
collection PubMed
description Endorectal balloons (ERBs) are routinely used in prostate proton radiation therapy to immobilize the prostate and spare the rectal wall. Rectal gas can distend the rectum and displace the prostate even in the presence of ERBs. The purpose of this work was to quantify the effects an ERB with a passive gas release conduit had on the incidence of rectal gas. Fifteen patients who were treated with a standard ERB and 15 with a gas‐release ERB were selected for this retrospective study. Location and cross‐sectional area of gas pockets and the fraction of time they occurred on 1133 lateral kilovoltage (kV) images were analyzed. Gas locations were classified as trapped between the ERB and anterior rectal wall, between the ERB and posterior rectal wall, or superior to the ERB. For patients using the standard ERB, gas was found in at least one region in 45.8% of fractions. Gas was trapped in the anterior region in 37.1% of fractions, in the posterior region in 5.0% of fractions, and in the sigmoid region in 9.6% of fractions. For patients using the ERB with the gas‐release conduit, gas was found in at least one region in 19.7% of fractions. Gas was trapped in the anterior region in 5.6% of fractions, in the posterior region in 8.3% of fractions, and in the sigmoid region in 7.4% of fractions. Both the number of fractions with gas in the anterior region and the number of fractions with gas in at least one region were significantly higher in the former group than in the latter. The cross‐sectional area of trapped gas did not differ between the two groups. Thus gas‐release balloon can effectively release gas, and may be able to improve clinical workflow by reducing the need for catheterization. PACS number: 87.56.Da
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spelling pubmed-57182302018-04-02 Effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy Wootton, Landon S. Kudchadker, Rajat J. Beddar, A. Sam Lee, Andrew K. J Appl Clin Med Phys Radiation Oncology Physics Endorectal balloons (ERBs) are routinely used in prostate proton radiation therapy to immobilize the prostate and spare the rectal wall. Rectal gas can distend the rectum and displace the prostate even in the presence of ERBs. The purpose of this work was to quantify the effects an ERB with a passive gas release conduit had on the incidence of rectal gas. Fifteen patients who were treated with a standard ERB and 15 with a gas‐release ERB were selected for this retrospective study. Location and cross‐sectional area of gas pockets and the fraction of time they occurred on 1133 lateral kilovoltage (kV) images were analyzed. Gas locations were classified as trapped between the ERB and anterior rectal wall, between the ERB and posterior rectal wall, or superior to the ERB. For patients using the standard ERB, gas was found in at least one region in 45.8% of fractions. Gas was trapped in the anterior region in 37.1% of fractions, in the posterior region in 5.0% of fractions, and in the sigmoid region in 9.6% of fractions. For patients using the ERB with the gas‐release conduit, gas was found in at least one region in 19.7% of fractions. Gas was trapped in the anterior region in 5.6% of fractions, in the posterior region in 8.3% of fractions, and in the sigmoid region in 7.4% of fractions. Both the number of fractions with gas in the anterior region and the number of fractions with gas in at least one region were significantly higher in the former group than in the latter. The cross‐sectional area of trapped gas did not differ between the two groups. Thus gas‐release balloon can effectively release gas, and may be able to improve clinical workflow by reducing the need for catheterization. PACS number: 87.56.Da John Wiley and Sons Inc. 2012-09-06 /pmc/articles/PMC5718230/ /pubmed/22955660 http://dx.doi.org/10.1120/jacmp.v13i5.3945 Text en © 2012 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
Wootton, Landon S.
Kudchadker, Rajat J.
Beddar, A. Sam
Lee, Andrew K.
Effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy
title Effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy
title_full Effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy
title_fullStr Effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy
title_full_unstemmed Effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy
title_short Effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy
title_sort effectiveness of a novel gas‐release endorectal balloon in the removal of rectal gas for prostate proton radiation therapy
topic Radiation Oncology Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5718230/
https://www.ncbi.nlm.nih.gov/pubmed/22955660
http://dx.doi.org/10.1120/jacmp.v13i5.3945
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