Medical physics challenges in clinical MR-guided radiotherapy

C Kurz, G Buizza, G Landry, F Kamp, M Rabe… - Radiation …, 2020 - Springer
The integration of magnetic resonance imaging (MRI) for guidance in external beam
radiotherapy has faced significant research and development efforts in recent years. The …

Reference dosimetry in MRI-linacs: evaluation of available protocols and data to establish a Code of Practice

J De Pooter, I Billas, L de Prez, S Duane… - Physics in Medicine …, 2021 - iopscience.iop.org
With the rapid increase in clinical treatments with MRI-linacs, a consistent, harmonized and
sustainable ground for reference dosimetry in MRI-linacs is needed. Specific for reference …

Commissioning of a 1.5 T Elekta Unity MR‐linac: a single institution experience

JE Snyder, J St‐Aubin, S Yaddanapudi… - Journal of applied …, 2020 - Wiley Online Library
MR image‐guided radiotherapy has the potential to improve patient care, but integration of
an MRI scanner with a linear accelerator adds complexity to the commissioning process …

ICRU REPORT 97: MRI-guided radiation therapy using MRI-linear accelerators

PJ Keall, CK Glide-Hurst, M Cao, P Lee… - Journal of the …, 2022 - journals.sagepub.com
The International Commission on Radiation Units and Measurements (ICRU), since its
inception in 1925, has had as its principal objective the development of internationally …

Integrating a low-field open MR scanner with a static proton research beam line: proof of concept

SM Schellhammer, AL Hoffmann, S Gantz… - Physics in Medicine …, 2018 - iopscience.iop.org
On-line image guidance using magnetic resonance (MR) imaging is expected to improve the
targeting accuracy of proton therapy. However, to date no combined system exists. In this …

Monte Carlo study of ionization chamber magnetic field correction factors as a function of angle and beam quality

VN Malkov, DWO Rogers - Medical physics, 2018 - Wiley Online Library
Purpose To use EGSnrc Monte Carlo simulations for magnetic field dosimetry to determine
optimal measurement orientations, calculate beam quality conversion factors for 32 …

Beam characterisation of the 1.5 T MRI-linac

SJ Woodings, JJ Bluemink, JHW De Vries… - Physics in Medicine …, 2018 - iopscience.iop.org
As a prerequisite for clinical treatments it was necessary to characterize the Elekta 1.5 T MRI-
linac 7 MV FFF radiation beam. Following acceptance testing, beam characterization data …

Relative dosimetry with an MR‐linac: response of ion chambers, diamond, and diode detectors for off‐axis, depth dose, and output factor measurements

DJ O'Brien, J Dolan, S Pencea, N Schupp… - Medical …, 2018 - Wiley Online Library
Purpose The purpose of this study was to acquire beam data for an MR‐linac, with and
without a 1.5 T magnetic field, by using a variety of commercially available detectors to …

A formalism for reference dosimetry in photon beams in the presence of a magnetic field

B van Asselen, SJ Woodings, SL Hackett… - Physics in Medicine …, 2018 - iopscience.iop.org
A generic formalism is proposed for reference dosimetry in the presence of a magnetic field.
Besides the regular correction factors from the conventional reference dosimetry formalisms …

A finite element method for the determination of the relative response of ionization chambers in MR-linacs: simulation and experimental validation up to 1.5 T

S Pojtinger, RP Kapsch, OS Dohm… - Physics in Medicine & …, 2019 - iopscience.iop.org
In magnetic resonance (MR) guided radiotherapy, the magnetic field-dependent change in
the dose response of ionization chambers is typically included by means of a correction …