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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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