Keywords: Interventional Devices, MR-Guided InterventionsDephased MRI, e.g., used for the delineation of metallic interventional devices, is the reconstruction of images from a shifted k-space and can be achieved by introducing additional “White-Marker” magnetic field gradient moments into the acquisition scheme. A prototype 3D radial sequence was implemented to analyze and compare the artifact of a biopsy needle in a gel phantom for dephased GRE and dephased bSSFP contrast. We found dephased bSSFP to show improved artifact symmetry in comparison with dephased GRE. Undesired signal attributed to fat tissue interfaces in an ex-vivo phantom was successfully suppressed by introducing an altered bSSFP phase cycling.
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