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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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 |
work_keys_str_mv |
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