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For the past few decades, fibre-optic dosimeters (FODs) have been a focus of research for dosimetry with LINACs, owing to a unique set of advantageous qualities: compact dosimeter sizes, an all optical composition (i.e. no wires or electronics around their sensitive volume), real-time response proportional to the absorbed dose-rate in their sensitive volumes and direct water equivalence. Such a set of qualities makes FODs “near-correctionless” for dosimetry with LINACs, such that they have been recommended as in vivo dosimeters and small field dosimeters. Further, their scintillation and l...

In modern radiation therapy, treatment delivery techniques are getting increasingly complex to optimise patient outcomes. In modern radiation therapy clinics, there are conditions where accurate dosimetry is challenging, yet essential to ensure that optimal treatments are being delivered. These challenging dosimetry conditions require specialised dosimeters with a set of dosimetric qualities that allow them to remain accurate in such conditions. Fibre-coupled luminescent dosimeters possess a wealth of desirable qualities that make them advantageous for a wide range of dosimetry conditions. Due...

Objective. Reference dosimetry on an MRI-linac requires a chamber specific magnetic field correction factor, kB -. This work aims to measure the correction factor for a parallel plate chamber on a parallel MRI-linac. Approach. kB→is defined as the ratio of the absorbed dose to water calibration coefficient in the presence of the magnetic field, ND,wB→relative to that under 0 T conditions, ND,w0T. kB→was measured via a ND,w transfer to a field chamber at each magnetic field strength from a chamber with known ND,w and kB -. This was achieved on the parallel MRI-linac by moving the measurem...