Browsing by author "Billas, Ilias"
Now showing items 1-5 of 5
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Alanine dosimetry in strong magnetic fields: use as a transfer standard in MRI-guided radiotherapy.
Billas, I; Bouchard, H; Oelfke, U; Shipley, D; Gouldstone, C; et al. (IOP PUBLISHING LTD, 2020-06-03)Reference dosimetry in the presence of a strong magnetic field is challenging. Ionisation chambers have shown to be strongly affected by magnetic fields. There is a need for robust and stable detectors in MRI-guided ... -
Investigating the effect of a magnetic field on dose distributions at phantom-air interfaces using PRESAGE® 3D dosimeter and Monte Carlo simulations.
Costa, F; Doran, SJ; Hanson, IM; Nill, S; Billas, I; et al. (IOP PUBLISHING LTD, 2018-02-26)Dosimetric quality assurance (QA) of the new Elekta Unity (MR-linac) will differ from the QA performed of a conventional linac due to the constant magnetic field, which creates an electron return effect (ERE). In this work ... -
Reference dosimetry of MRI-guided radiotherapy machines
Oelfke, U; Billas, I (Institute of Cancer Research (University Of London), 2021-09-30)A cutting-edge cancer treatment modality, that integrates MRI guidance and delivery of radiotherapy (MRIgRT), sets a new standard for personalised radiotherapy. There are, however, aspects around the accurate determination ... -
The effect of magnetic field strength on the response of Gafchromic EBT-3 film.
Billas, I; Bouchard, H; Oelfke, U; Duane, S (IOP PUBLISHING LTD, 2019-03-14)With the advent of MRI-guided radiotherapy, the suitability of commercially available radiation dose detectors needs to be assessed. The aim of this study was to investigate the effect of the magnetic field (B-field) on ... -
Traceable reference dosimetry in MRI guided radiotherapy using alanine: calibration and magnetic field correction factors of ionisation chambers.
Billas, I; Bouchard, H; Oelfke, U; Duane, S (IOP PUBLISHING LTD, 2021-08-06)Magnetic resonance imaging (MRI)-guided radiotherapy (RT) (MRIgRT) falls outside the scope of existing high energy photon therapy dosimetry protocols, because those protocols do not consider the effects of the magnetic ...