A hybrid multi-spectral approach for near metal imaging: combining the best of phase and frequency encoding

In this work the feasibility of a new hybrid multi-spectral method is investigated using two orthopedic implants. The method combines on-resonance frequency encoded with off-resonance reduced field of view fully phase encoded images, to exploit the efficiency of frequency encoding and the geometrical accuracy of phase encoding. Hybrid images were compared to MAVRIC-type images, showing that the hybrid method was able to improve the image quality adjacent to metal implants. Large excitation bandwidths and a reduced field-of-view could be used for the phase encoded images, decreasing the number of necessary off-resonance acquisitions and reducing the acquisition time compared to solely phase encoded imaging.

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