Abstract
The vast majority of the metal-related artifacts in magnetic resonance imaging (MRI)
arise from B0 inhomogeneity. These artifacts include failed fat suppression, signal loss, signal
pileup, and image distortions. Metal artifact reduction sequence MRI has been used
to mitigate these artifacts via optimization of the scan parameters and exploiting
new techniques such as fully phase-encoded imaging and multispectral imaging including
multi-acquisition variable-resonance image combination and slice encoding for metal
artifact correction. Applicability of MRI in the vicinity of metal implants has been
revolutionized by these new techniques at the expense of longer acquisition times.
To reach clinically viable scan times, these novel techniques have been successfully
coupled with various acceleration paradigms such as parallel imaging and compressed
sensing.
Keywords
metal imaging - hip arthroplasty - artifact reduction - MARS - MRI - SEMAC - MAVRIC
- compressed sensing