Comparison of two programs in calculating electron output factors at extended source-surface distances
Monitor units (MUs) calculated by radiotherapy treatment planning systems need to be verified independently. At extended source-surface distances (SSDs), different output factors (OFs) can be given by different independent MU checking packages due to the calculation methods used and assumptions made...
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doaj-9b714f017d5248508718f68ab0f1a9242020-11-24T23:39:13ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132016-01-01411586410.4103/0971-6203.177283Comparison of two programs in calculating electron output factors at extended source-surface distancesYunfei HuJonathan Andrew LambertYang WangMonitor units (MUs) calculated by radiotherapy treatment planning systems need to be verified independently. At extended source-surface distances (SSDs), different output factors (OFs) can be given by different independent MU checking packages due to the calculation methods used and assumptions made within them. The accuracy of two software packages - RadCalc® (LifeLine Software Inc., Austin, USA) and eDatabook (Y. Wang, Radiation Oncology Institute, Sydney, AUS) - was determined by comparing the calculated OFs directly to measured OFs for a series of standard electron cutouts on an Elekta Synergy linear accelerator at standard and extended SSDs (100 cm and above). For the majority of the measurements made, eDatabook provided OFs closer to the measured value than RadCalc; however, in two cases, eDatabook was unable to provide a factor. RadCalc failed to calculate the OFs accurately at extended SSDs as its calculation is based on the assumption that the established effective-SSD curve can accurately predict the data where there are no measurements available. The accuracy of eDatabook is due to its use of a linear interpolation to determine the OF at an extended SSD when there are no measurement data available.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2016;volume=41;issue=1;spage=58;epage=64;aulast=HuElectronmonitor unit verificationoutput factor |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yunfei Hu Jonathan Andrew Lambert Yang Wang |
spellingShingle |
Yunfei Hu Jonathan Andrew Lambert Yang Wang Comparison of two programs in calculating electron output factors at extended source-surface distances Journal of Medical Physics Electron monitor unit verification output factor |
author_facet |
Yunfei Hu Jonathan Andrew Lambert Yang Wang |
author_sort |
Yunfei Hu |
title |
Comparison of two programs in calculating electron output factors at extended source-surface distances |
title_short |
Comparison of two programs in calculating electron output factors at extended source-surface distances |
title_full |
Comparison of two programs in calculating electron output factors at extended source-surface distances |
title_fullStr |
Comparison of two programs in calculating electron output factors at extended source-surface distances |
title_full_unstemmed |
Comparison of two programs in calculating electron output factors at extended source-surface distances |
title_sort |
comparison of two programs in calculating electron output factors at extended source-surface distances |
publisher |
Wolters Kluwer Medknow Publications |
series |
Journal of Medical Physics |
issn |
0971-6203 1998-3913 |
publishDate |
2016-01-01 |
description |
Monitor units (MUs) calculated by radiotherapy treatment planning systems need to be verified independently. At extended source-surface distances (SSDs), different output factors (OFs) can be given by different independent MU checking packages due to the calculation methods used and assumptions made within them. The accuracy of two software packages - RadCalc® (LifeLine Software Inc., Austin, USA) and eDatabook (Y. Wang, Radiation Oncology Institute, Sydney, AUS) - was determined by comparing the calculated OFs directly to measured OFs for a series of standard electron cutouts on an Elekta Synergy linear accelerator at standard and extended SSDs (100 cm and above). For the majority of the measurements made, eDatabook provided OFs closer to the measured value than RadCalc; however, in two cases, eDatabook was unable to provide a factor. RadCalc failed to calculate the OFs accurately at extended SSDs as its calculation is based on the assumption that the established effective-SSD curve can accurately predict the data where there are no measurements available. The accuracy of eDatabook is due to its use of a linear interpolation to determine the OF at an extended SSD when there are no measurement data available. |
topic |
Electron monitor unit verification output factor |
url |
http://www.jmp.org.in/article.asp?issn=0971-6203;year=2016;volume=41;issue=1;spage=58;epage=64;aulast=Hu |
work_keys_str_mv |
AT yunfeihu comparisonoftwoprogramsincalculatingelectronoutputfactorsatextendedsourcesurfacedistances AT jonathanandrewlambert comparisonoftwoprogramsincalculatingelectronoutputfactorsatextendedsourcesurfacedistances AT yangwang comparisonoftwoprogramsincalculatingelectronoutputfactorsatextendedsourcesurfacedistances |
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