https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 Dosimetry of ionising radiation in modern radiation oncology https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25064 in vivo dosimetry, brachytherapy and auditing of radiotherapy practice. Recent developments of dosimeters that can be used for these purposes are discussed using spatial resolution and number of dimensions for measurement as sorting criteria. While dosimetry is ever evolving to address the needs of advancing applications of radiation in medicine two fundamental issues remain: the accuracy of the measurement from a scientific perspective and the importance to link the measurement to a clinically relevant question. This review aims to provide an update on both of these.]]> Wed 24 Nov 2021 15:51:37 AEDT ]]> Automatic radiotherapy delineation quality assurance on prostate MRI with deep learning in a multicentre clinical trial https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43531 Wed 21 Sep 2022 11:32:29 AEST ]]> Feasibility of multi-atlas cardiac segmentation from thoracic planning CT in a probabilistic framework https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36472 Wed 15 Dec 2021 16:08:31 AEDT ]]> Comparison between the TRS-398 code of practice and the TG-51 dosimetry protocol for flattening filter free beams https://ogma.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 an amorphous silicon EPID for measurement and quality assurance of enhanced dynamic wedge https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3150 Wed 11 Apr 2018 12:05:00 AEST ]]> Spatial features of dose-surface maps from deformably-registered plans correlate with late gastrointestinal complications https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:31828 Wed 09 Mar 2022 16:00:57 AEDT ]]> Virtual EPID standard phantom audit (VESPA) for remote IMRT and VMAT credentialing https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34305 Tue 26 Feb 2019 15:18:09 AEDT ]]> Remote EPID-based dosimetric auditing using DVH patient dose analysis https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52776 Thu 26 Oct 2023 14:54:32 AEDT ]]> Fast automated segmentation of multiple objects via spatially weighted shape learning https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29622 Thu 09 Dec 2021 11:02:48 AEDT ]]> Correlations between contouring similarity metrics and simulated treatment outcome for prostate radiotherapy https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43126 Thu 02 Nov 2023 13:16:15 AEDT ]]> Comparison of sources of exit fluence variation for IMRT https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:8344 Sat 24 Mar 2018 08:39:53 AEDT ]]> Direct-detection EPID dosimetry: investigation of a potential clinical configuration for IMRT verification https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:7317 Sat 24 Mar 2018 08:38:52 AEDT ]]> Cone beam computerized tomography: the effect of calibration of the Hounsfield unit number to electron density on dose calculation accuracy for adaptive radiation therapy https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:7971 Sat 24 Mar 2018 08:33:40 AEDT ]]> An experimental investigation into the radiation field offset of a dynamic multileaf collimator https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1021 Sat 24 Mar 2018 08:29:47 AEDT ]]> Variations in dose response with x-ray energy of LiF: Mg,Cu,P thermoluminescence dosimeters: implications for clinical dosimetry https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:2264 Sat 24 Mar 2018 08:27:02 AEDT ]]> Reduction of the effect of non-uniform backscatter from an E-type support arm of a Varian a-Si EPID used for dosimetry https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:11188 Sat 24 Mar 2018 08:13:36 AEDT ]]> Two non-parametric methods for derivation of constraints from radiotherapy dose-histogram data https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20796 Sat 24 Mar 2018 08:05:59 AEDT ]]> An independent system for real-time dynamic multileaf collimation trajectory verification using EPID https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21332 Sat 24 Mar 2018 07:52:48 AEDT ]]> Investigation of the sag in linac secondary collimator and MLC carriage during arc deliveries https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21546 Sat 24 Mar 2018 07:50:25 AEDT ]]> Finding the optimal statistical model to describe target motion during radiotherapy delivery - a Bayesian approach https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21551 Sat 24 Mar 2018 07:50:23 AEDT ]]> MRI simulation: end-to-end testing for prostate radiation therapy using geometric pelvic MRI phantoms https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27970 Sat 24 Mar 2018 07:38:43 AEDT ]]> Quantification of lung tumor rotation with automated landmark extraction using orthogonal cine MRI images https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26384 Sat 24 Mar 2018 07:33:05 AEDT ]]> Transit dosimetry in IMRT with an a-Si EPID in direct detection configuration https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:28541 Sat 24 Mar 2018 07:28:47 AEDT ]]> Calculating radiotherapy margins based on Bayesian modelling of patient specific random errors https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27483 Sat 24 Mar 2018 07:25:39 AEDT ]]> Prostate implant evaluation using tumour control probability: the effect of input parameters https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3423 Sat 24 Mar 2018 07:21:37 AEDT ]]> Motion prediction in MRI-guided radiotherapy based on interleaved orthogonal cine-MRI https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24544 Sat 24 Mar 2018 07:11:33 AEDT ]]> MRI-only treatment planning: benefits and challenges https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47471 Mon 23 Jan 2023 11:05:51 AEDT ]]> Localised delineation uncertainty for iterative atlas selection in automatic cardiac segmentation https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40043 Fri 22 Jul 2022 13:20:28 AEST ]]> Validation of a new open-source method for automatic delineation and dose assessment of the heart and LADCA in breast radiotherapy with simultaneous uncertainty estimation https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49482 Fri 19 May 2023 15:49:16 AEST ]]> Geometric uncertainty analysis of MLC tracking for lung SABR https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39998 Fri 15 Jul 2022 11:01:56 AEST ]]> Investigating the generalisation of an atlas-based synthetic-CT algorithm to another centre and MR scanner for prostate MR-only radiotherapy https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33736 1V) and without (sCT) a one voxel body contour expansion included in the algorithm. This was to test whether this expansion was required for 1.5 T images. Both synthetic CT's were rigidly registered to the planning CT (pCT). A 6 MV Volumetric Modulated Arc Therapy plan was created on the pCT and recalculated on the sCT and sCT1V The synthetic CT's dose distributions were compared to the dose distribution calculated on the pCT. The percentage dose difference at isocentre without the body contour expansion (sCT - pCT) was ΔDsCT = (0.9 ± 0.8) % and with (sCT1V-pCT) was ΔDsCT1V = (-0.7 ± 0.7) % (mean ± one standard deviation). The sCT1V; result was within one standard deviation of zero and agreed with the result reported previously using 3 T MR data. The sCT dose difference only agreed within two standard deviations. The mean ± one standard deviation gamma pass rate was ΓsCT = 96.1 ± 2.9% for the sCT and ΓsCT1V = 98.8 ± 0.5% for the sCT1V (with 2% global dose difference and 2 mm distance to agreement gamma criteria). The one voxel body contour expansion improves the synthetic CT accuracy for MR images acquired at 1.5 T but requires the MR voxel size to be similar to the atlas MR voxel size. This study suggests that the atlas-based algorithm can be generalised to MR data acquired using a different field strength at a different centre.]]> Fri 14 Dec 2018 14:42:04 AEDT ]]>