Robust Principal Component Analysis for Separation of On and Off-resonance in 3D Multispectral MRI

Stanford researchers have designed a system to provide accelerated magnetic resonance imaging (MRI) in the presence of metallic implants, which induce variations in the static magnetic field that normally require long scan times. Acquisition is accelerated by a complementary subsampling scheme. A highly constrained reconstruction is used to recover on- and off-resonance components, represented as rank 1 and sparse matrices respectively.

The system enables approximately four-fold acceleration relative to what can be achieved with conventional parallel imaging and partial Fourier.