Optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 MV photons by three different methodologies with different detector-phantom combinations: A comparative study

The study was aimed to compare accuracy of monitor unit verification in intensity modulated radiation therapy (IMRT) using 6 MV photons by three different methodologies with different detector phantom combinations. Sixty patients were randomly chosen. Zero degree couch and gantry angle plans were ge...

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Main Authors: Sarkar Biplab, Ghosh Bhaswar, Sriramprasath, Mahendramohan Sukumaran, Basu Ayan, Goswami Jyotirup, Ray Amitabh
Format: Article
Language:English
Published: Wolters Kluwer Medknow Publications 2010-01-01
Series:Journal of Medical Physics
Subjects:
Online Access:http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=3;spage=144;epage=150;aulast=Sarkar
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spelling doaj-55baf781958943e2886e396d818a179e2020-11-24T22:42:45ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132010-01-01353144150Optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 MV photons by three different methodologies with different detector-phantom combinations: A comparative studySarkar BiplabGhosh BhaswarSriramprasathMahendramohan SukumaranBasu AyanGoswami JyotirupRay AmitabhThe study was aimed to compare accuracy of monitor unit verification in intensity modulated radiation therapy (IMRT) using 6 MV photons by three different methodologies with different detector phantom combinations. Sixty patients were randomly chosen. Zero degree couch and gantry angle plans were generated in a plastic universal IMRT verification phantom and 30Χ30Χ30 cc water phantom and measured using 0.125 cc and 0.6 cc chambers, respectively. Actual gantry and couch angle plans were also measured in water phantom using 0.6 cc chamber. A suitable point of measurement was chosen from the beam profile for each field. When the zero-degree gantry, couch angle plans and actual gantry, couch angle plans were measured by 0.6 cc chamber in water phantom, the percentage mean difference (MD) was 1.35%, 2.94 % and Standard Deviation (SD) was 2.99%, 5.22%, respectively. The plastic phantom measurements with 0.125 cc chamber Semiflex ionisation chamber (SIC) showed an MD=4.21% and SD=2.73 %, but when corrected for chamber-medium response, they showed an improvement, with MD=3.38 % and SD=2.59 %. It was found that measurements with water phantom and 0.6cc chamber at gantry angle zero degree showed better conformity than other measurements of medium-detector combinations. Correction in plastic phantom measurement improved the result only marginally, and actual gantry angle measurement in a flat- water phantom showed higher deviation.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=3;spage=144;epage=150;aulast=SarkarDose verificationpoint dose measurementquality assurance
collection DOAJ
language English
format Article
sources DOAJ
author Sarkar Biplab
Ghosh Bhaswar
Sriramprasath
Mahendramohan Sukumaran
Basu Ayan
Goswami Jyotirup
Ray Amitabh
spellingShingle Sarkar Biplab
Ghosh Bhaswar
Sriramprasath
Mahendramohan Sukumaran
Basu Ayan
Goswami Jyotirup
Ray Amitabh
Optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 MV photons by three different methodologies with different detector-phantom combinations: A comparative study
Journal of Medical Physics
Dose verification
point dose measurement
quality assurance
author_facet Sarkar Biplab
Ghosh Bhaswar
Sriramprasath
Mahendramohan Sukumaran
Basu Ayan
Goswami Jyotirup
Ray Amitabh
author_sort Sarkar Biplab
title Optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 MV photons by three different methodologies with different detector-phantom combinations: A comparative study
title_short Optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 MV photons by three different methodologies with different detector-phantom combinations: A comparative study
title_full Optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 MV photons by three different methodologies with different detector-phantom combinations: A comparative study
title_fullStr Optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 MV photons by three different methodologies with different detector-phantom combinations: A comparative study
title_full_unstemmed Optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 MV photons by three different methodologies with different detector-phantom combinations: A comparative study
title_sort optimized point dose measurement for monitor unit verification in intensity modulated radiation therapy using 6 mv photons by three different methodologies with different detector-phantom combinations: a comparative study
publisher Wolters Kluwer Medknow Publications
series Journal of Medical Physics
issn 0971-6203
1998-3913
publishDate 2010-01-01
description The study was aimed to compare accuracy of monitor unit verification in intensity modulated radiation therapy (IMRT) using 6 MV photons by three different methodologies with different detector phantom combinations. Sixty patients were randomly chosen. Zero degree couch and gantry angle plans were generated in a plastic universal IMRT verification phantom and 30Χ30Χ30 cc water phantom and measured using 0.125 cc and 0.6 cc chambers, respectively. Actual gantry and couch angle plans were also measured in water phantom using 0.6 cc chamber. A suitable point of measurement was chosen from the beam profile for each field. When the zero-degree gantry, couch angle plans and actual gantry, couch angle plans were measured by 0.6 cc chamber in water phantom, the percentage mean difference (MD) was 1.35%, 2.94 % and Standard Deviation (SD) was 2.99%, 5.22%, respectively. The plastic phantom measurements with 0.125 cc chamber Semiflex ionisation chamber (SIC) showed an MD=4.21% and SD=2.73 %, but when corrected for chamber-medium response, they showed an improvement, with MD=3.38 % and SD=2.59 %. It was found that measurements with water phantom and 0.6cc chamber at gantry angle zero degree showed better conformity than other measurements of medium-detector combinations. Correction in plastic phantom measurement improved the result only marginally, and actual gantry angle measurement in a flat- water phantom showed higher deviation.
topic Dose verification
point dose measurement
quality assurance
url http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=3;spage=144;epage=150;aulast=Sarkar
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