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Semin Musculoskelet Radiol 2017; 21(05): 604-615
DOI: 10.1055/s-0037-1606135
Review Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Leaps in Technology: Advanced MR Imaging after Total Hip Arthroplasty

Iman Khodarahmi
1   Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland
2   Department of Radiology, Rutgers New Jersey Medical School, Newark, New Jersey
,
Mathias Nittka
3   Siemens Healthcare GmbH, Erlangen, Germany
,
Jan Fritz
1   Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland
› Author Affiliations
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Publication Date:
12 October 2017 (online)

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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