Spectral bin un-aliasing for reduced field-of-view magnetic resonance imaging near metal implants

A magnetic resonance imaging (MRI) method comprising:

• performing, by a MRI scanner having a plurality of radio frequency (RF) receivers, a first scan according to a first field of view to acquire first multi-spectral MRI data associated with a plurality of frequency bins and corresponding to an anatomy area including an implant;
• generating, by a processor for each pair of a single RF receiver and a single frequency bin, a respective spectral sensitivity map using at least a portion of the first multi-spectral MRI data;
• performing, by the MRI scanner, a second scan according to a second field of view to acquire second multi-spectral MRI data associated with the plurality of frequency bins and corresponding to the anatomy area including an implant, the second field of view smaller than the first field of view;
• and
• reconstructing, by the processor, one or more MRI images according to the second field of view using the second multi-spectral MRI data and the spectral sensitivity maps.

A non-transitory computer-readable medium comprising computer executable instructions stored thereon, the computer executable instructions when executed by a processor, cause the processor to:

• cause the MRI scanner to a perform a first scan according to a first field of view to acquire first multi-spectral MRI data associated with a plurality of frequency bins and corresponding to an anatomy area including an implant;
• generate, for each pair of a single RF receiver and a single frequency bin, a respective spectral sensitivity map using at least a portion of the first multi-spectral MRI data;
• cause the MRI scanner to a perform a second scan according to a second field of view to acquire second multi-spectral MRI data associated with the plurality of frequency bins and corresponding to the anatomy area including an implant, the second field of view smaller than the first field of view;
• and
• reconstruct one or more MRI images according to the second field of view using the second multi-spectral MRI data and the spectral sensitivity map.