https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:15790 Wed 11 Apr 2018 11:33:04 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7062 Sat 24 Mar 2018 08:38:01 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7068 Sat 24 Mar 2018 08:37:56 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7127 10% of maximum, in-field signal). Using the continuous acquisition mode, the EPID response was not linear with dose. It was found that the continuous mode dose response corresponded approximately to dropping one image per acquisition session. Reproducibility of EPID response to low monitor units (MUs) was found to be poor but greatly improved with increasing MU. Open field profiles were found to be stable in the cross-plane direction but required several frames to become stable in the in-plane direction. However, both of these issues are clinically insignificant due to arc-IMRT deliveries requiring relatively large monitor units (>100 MU). Analysis of the five IMRT, arc, and arc-IMRT tests revealed that all examples compared to within 2% of maximum dose for more than 95% of in-field pixels. The continuous acquisition mode is suited to time-resolved dosimetry applications including arc-IMRT and dynamic IMRT, giving comparable dose results to the well-studied integrated acquisition mode, although caution should be used in low MU applications. Time-resolved EPID dose information also compared well to time-resolved ion-chamber measurements.]]> Sat 24 Mar 2018 08:34:10 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:11002 Sat 24 Mar 2018 08:12:40 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:18230 Sat 24 Mar 2018 08:04:51 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26271 20% of prescription, excluding PTV and skin build-up region). Conclusions: An algorithm to reconstruct delivered patient 3D doses from EPID exit dosimetry measurements was presented. The method was applied to phantom and patient data sets, as well as for dynamic IMRT and VMAT delivery techniques. Results indicate that the EPID dose reconstruction algorithm presented in this work is suitable for clinical implementation.]]> Sat 24 Mar 2018 07:40:16 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51889 Fri 22 Sep 2023 09:22:44 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51888 Fri 22 Sep 2023 09:22:04 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19933 Fri 10 Nov 2023 15:58:39 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37599 Fri 05 Mar 2021 15:28:39 AEDT ]]>