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