PD-0410: Design and commissioning of a robotic in-room imaging system for patient setup verification in particle therapy

Conclusions: Gantry position dependent field inhomogeneity in our upgraded MRI-linac prototype can be mitigated by appropriate shimming in combination with a minimum read-out gradient strength of 10mTm to yield a spatial accuracy of 1.0mm.Given the reproducibility of the shim settings, look-up-table-based shimming is feasible for static gantry positions. This reduces the preparation time needed before imaging after the gantry angle has changed. For simultaneous gantry rotation and MR imaging, look-up-table-based dynamic shimming solutions may be implemented.