Abstract #2124

Validation of a 4D-MRI motion framework using an MRI-compatible motion phantom

Bjorn Stemkens¹, Rob HN Tijssen¹, Jan JW Lagendijk¹, and Cornelis AT van den Berg¹

¹Department of Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands

Geometric accuracy is vital for MR-guided radiotherapy. In this study we quantify the geometric fidelity of a retrospectively sorted 4D-MRI and 2D MS cine-MR acquisition, which serve as input for a motion model for dose accumulation mapping and tumor tracking. A linearly moving MRI-compatible motion phantom was used to quantify the positional error in the 4D-MRI and 2D MS acquisitions using a range of user-defined motion trajectories. Geometrical errors were found to be smaller than the voxel or pixel size.

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