Meeting Banner
Abstract #3562

Evaluation of Multileaf Collimator performance in high magnetic fringe fields for MRI-Linac development

Bin Dong1,2, Gary P. Liney1,2,3,4, Kevin K. Zhang1,4, Lois Holloway1,2,3,4,5, Peter E. Metcalfe1,2, and Paul J. Keall1,5

1Ingham Institute for Applied Medical Research, Liverpool, Australia, 2Centre for Medical Radiation Physics (CMRP), University of Wollongong, Wollongong, Australia, 3Department of Medical Physics, Cancer Therapy Centre, Liverpool Hospital, Liverpool, Australia, 4South Western Sydney Clinical School, University of New South Wales, Liverpool, Australia, 5Radiation Physics Laboratory, Sydney Medical School, The University of Sydney, Camperdown, Australia

Hybrid systems combining an MRI with a linear accelerator for image guided radiation treatment are being implemented world-wide. As part of our own development we investigated the effect of increasing magnetic field on the performance of a multi-leaf collimator (MLC) motor and encoder from the treatment head of a linear accelerator. Measurements were made at various locations in the fringe field of a 3T scanner with the MLC positioned to replicate both in-line and perpendicular treatment beam to B0 directions. Results show a static field threshold and speed reduction which is position dependent which can be improved significantly with shielding.

This abstract and the presentation materials are available to members only; a login is required.

Join Here