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Abstract #1780

Quantitative Magnetization Transfer Imaging in Glioblastoma Patients using Balanced Steady-state Free Precession on a 1.5 T MR-Linac

Brandon Thien Trong Tran1, Liam S. P. Lawrence1, Rachel W. Chan2, Chia-Lin Tseng3, Jay Detsky3, Hany Soliman3, Arjun Sahgal3, and Angus Z. Lau1,2
1Medical Biophysics, University of Toronto, Toronto, ON, Canada, 2Physical Sciences Platform, Sunnybrook Research Institute, Toronto, ON, Canada, 3Radiation Oncology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada

Synopsis

Keywords: Quantitative Imaging, Magnetization transfer

Quantitative magnetization transfer (qMT) imaging could be used to assess tumor response on an MR-Linac. However, qMT protocols which use an off-resonance saturation pulse are slow and does not have the 3D coverage necessary to assess tumor response. We implemented a fast 3D balanced steady-state free precession qMT protocol on the MR-Linac. Six glioblastoma patients were scanned on the MR-Linac at weekly intervals during treatment. qMT parameter maps derived using non-linear least square fitting show similar contrast to other qMT protocols. Within-subject coefficient of variation was higher than values found in literature for off-resonance qMT protocols.

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Keywords