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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 -1 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 MRdoi:10.1016/s0167-8140(15)32716-x fatcat:4im64ylwivdsnphk7s5kyqkbte