Phase unwrapping near metal implants with prior knowledge of the implant geometry

The three-point Dixon technique can be used to successfully suppress fat near metal implants if the phase shift due to the B0 field inhomogeneities can be estimated accurately. This research describes a new technique where the phase unwrapping is guided by prior knowledge of the implant. Using an approximate model of the implant location and orientation, the phase unwrapping is simplified to estimating the difference between the model and true phase shift. The model is rotated and translated to minimise the phase unwrapping required. Initial results obtained from simulation are shown.

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