https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 Improving the resolution of dynamic intensity modulated radiation therapy delivery by reducing the multileaf collimator sampling distance https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:1841 Wed 11 Apr 2018 17:21:51 AEST ]]> A novel anthropomorphic pelvic phantom designed for multicentre level III dosimetry intercomparison https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:4654 Wed 11 Apr 2018 17:08:57 AEST ]]> Comparison between the TRS-398 code of practice and the TG-51 dosimetry protocol for flattening filter free beams https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25165 Q calculations which show a much smaller difference between FFF and flattened beams than originally predicted. These results are explained by the inclusion of the added backscatter plates and build-up filters used in modern clinical FFF linacs, compared to a Monte Carlo model of an FFF linac in which the flattening filter is removed and no additional build-up or backscatter plate is added.]]> Wed 11 Apr 2018 16:42:22 AEST ]]> Investigation of a modified electronic portal imaging device for improving dosimetry in radiotherapy https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:10089 Wed 11 Apr 2018 15:30:58 AEST ]]> Off-axis dose response characteristics of an amorphous silicon electronic portal imaging device https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3151 Wed 11 Apr 2018 14:33:52 AEST ]]> Experimental investigation of the response of an amorphous silicon EPID to intensity modulated radiotherapy beams https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3149 Wed 11 Apr 2018 13:42:46 AEST ]]> Real-time radiotherapy error detection using transit beam image processing https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23631 Wed 11 Apr 2018 11:14:33 AEST ]]> Improvement of EPID-based techniques for dosimetry and investigation of linac mechanical performance in advanced radiotherapy https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12130 Wed 11 Apr 2018 10:17:44 AEST ]]> Dosimetric characteristics of a low-kV intro-operative x-ray source: implications for use in a clinical trial for treatment of low-risk breast cancer https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3284 Wed 11 Apr 2018 10:12:01 AEST ]]> Characterization of an organic semiconductor diode for dosimetry in radiotherapy https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38241 Tue 17 Aug 2021 11:02:53 AEST ]]> EPID-based dosimetry to verify IMRT planar dose distribution for the aS1200 EPID and FFF beams https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29751 Tue 16 Mar 2021 10:50:28 AEDT ]]> A remote EPID-based dosimetric TPS-planned audit of centers for clinical trials: outcomes and analysis of contributing factors https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42881 1 for four comparisons, indicating higher GPRs of the remote audit than the reference audits. Conclusion: The remote dosimetry audit method for clinical trials demonstrated high GPRs and provided results comparable to established more resource-intensive audit methods. Several factors were found to influence the results including some effect of Linac-TPS combination.]]> Tue 06 Sep 2022 11:51:21 AEST ]]> Impact of backscattered radiation from the bunker structure on EPID dosimetry https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17097 Tue 04 Apr 2023 19:30:17 AEST ]]> An EPID based method for efficient and precise asymmetric jaw alignment quality assurance https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7400 Sat 24 Mar 2018 11:14:02 AEDT ]]> EPID dosimetry: effect of different layers of materials on absorbed dose response https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7064 Sat 24 Mar 2018 08:37:58 AEDT ]]> Direct dose to water dosimetry for pretreatment IMRT verification using a modified EPID https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17704 Sat 24 Mar 2018 07:57:30 AEDT ]]> Simulation of real-time EPID images during IMRT using Monte-Carlo https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21376 Sat 24 Mar 2018 07:51:26 AEDT ]]> Improvement of Varian a-Si EPID dosimetry measurements using a lead-shielded support-arm https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21545 Sat 24 Mar 2018 07:50:26 AEDT ]]> The impact of MLC transmitted radiation on EPID dosimetry for dynamic MLC beams https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5040 Sat 24 Mar 2018 07:45:40 AEDT ]]> Initial evaluation of a commercial EPID modified to a novel direct-detection configuration for radiotherapy dosimetry https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5384 Sat 24 Mar 2018 07:43:54 AEDT ]]> Calculating radiotherapy margins based on Bayesian modelling of patient specific random errors https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27483 Sat 24 Mar 2018 07:25:39 AEDT ]]> Dose-to-water conversion for the backscatter-shielded EPID: a frame-based method to correct for EPID energy response to MLC transmitted radiation https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19690 Fri 20 Jul 2018 15:04:41 AEST ]]> Empirical study of the spatial variation of recombination, polarity and polarization effects in ionization chambers https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42225 3 Farmer-type chamber and the Exradin model A5 100 cm³ spherical chamber. Recombination was found to vary according to the local electric field strength inside the chamber and the volume of air presented to the beam. The bias polarity effect was found to be small and relatively uniform across the chamber. Within the accuracy of the measurements, no difference could be determined between response scans with the electric field vector of the incident beam aligned parallel and orthogonal to the chamber axis.]]> Fri 19 Aug 2022 11:35:28 AEST ]]> Measuring the dose in bone for spine stereotactic body radiotherapy https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49359 Fri 12 May 2023 12:35:35 AEST ]]> Credentialing of vertebral stereotactic ablative body radiotherapy in a multi-centre trial https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38954 90% passing 2%/2mm/10% threshold) and ≤ 1 mm positional accuracy at target-cord interface was required. Results: 19 centres were credentialed; 11 had on-site measurement. Delivery devices included linear accelerator, TomoTherapy and CyberKnife systems. Five centres did not achieve 90% gamma passing rate. Of these, three were out of tolerance (OOT) in low (<5Gy) dose regions and > 80% passing rate and deemed acceptable. Two were OOT over the full dose range: one elected not to remeasure; the other also had positional discrepancy greater than 1 mm and repeat measurement with a new plan was in tolerance. The original OOT was attributed to inappropriate MLC constraints. All centres delivered planned target-cord dose gradient within 1 mm. Conclusion: Credentialing measurements for vertebral SABR in a multi-centre trial showed although the majority of centres delivered accurate vertebral SABR, there is high value in independent audit measurements. One centre with inappropriate MLC settings was detected, which may have resulted in delivery of clinically unacceptable vertebral SABR plans.]]> Fri 11 Mar 2022 15:47:13 AEDT ]]> Development and testing of an improved dosimetry system using a backscatter shielded electronic portal imaging device https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21566 Fri 10 Nov 2023 16:00:54 AEDT ]]> Characterization of optical transport effects on EPID dosimetry using Geant4 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19880 Fri 10 Nov 2023 15:59:12 AEDT ]]> A method for removing arm backscatter from EPID images https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19932 Fri 10 Nov 2023 15:57:09 AEDT ]]>