Alternating gradients for metal-induced artifacts correction in magnetic resonance imaging
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsXinwei Shi, Brian A. Hargreaves
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Abstract
A method for magnetic resonance imaging suppresses off-resonance gradient-induced image artifacts due to metal. The method includes performing by a magnetic resonance imaging (MRI) apparatus two multi-spectral imaging (MSI) acquisitions within a field of view of the MRI apparatus, where the two MSI acquisitions have alternating-sign readout gradients. The two MSI acquisitions are then processed and combined by the MRI apparatus using a weighted image combination to produce a final image.
Claims4
A method for magnetic resonance imaging that suppresses off-resonance gradient-induced image artifacts due to metal, the method comprising:
- performing by a magnetic resonance imaging (MRI) apparatus two multi-spectral imaging (MSI) acquisitions within a field of view of the MRI apparatus, where the two MSI acquisitions have alternating-sign readout gradients during signal readout;
- and
- processing and combining by the MRI apparatus the two MSI acquisitions using a weighted image combination to produce a final image;
- wherein combining the two MSI acquisitions using the weighted image combination comprises weighting a MSI acquisition m+ with weight w+, weighting a MSI acquisition m− with weight w−, where the weights w+ and w− include effects of both an RF excitation weight wRF and local gradient weight wG, and where MSI acquisition m+ and MSI acquisition m− have opposite directions of readout gradients.
Dependencies are inferred from the claim text.