We characterize the gradient system of a hybrid 1.5T MRI-Linac, which has been developed as the ideal platform for MRI-guided radiotherapy. The system is equipped with a split gradient coil that potentially complicates reconstruction of non-Cartesian sequences such as ultra short echo time (UTE) imaging, which is a promising sequence for pseudo-CT generation and lung imaging. Here, we determine the zeroth and first spatial order gradient impulse responses. These are used to show that UTE imaging is feasible and image quality can be increased significantly using the gradient impulse response.
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