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