Faculty Collaboration Database

New MR imaging methods for metallic implants in the knee: artifact correction and clinical impact. J Magn Reson Imaging 2011 May;33(5):1121-7

Date

04/22/2011

Pubmed ID

21509870

Pubmed Central ID

PMC3081101

DOI

10.1002/jmri.22534

Scopus ID

2-s2.0-79955445924 (requires institutional sign-in at Scopus site)   83 Citations

Abstract

PURPOSE: To evaluate two magnetic resonance imaging (MRI) techniques, slice encoding for metal artifact correction (SEMAC) and multiacquisition variable-resonance image combination (MAVRIC), for their ability to correct for artifacts in postoperative knees with metal.

MATERIALS AND METHODS: A total of 25 knees were imaged in this study. Fourteen total knee replacements (TKRs) in volunteers were scanned with SEMAC, MAVRIC, and 2D fast spin-echo (FSE) to measure artifact extent and implant rotation. The ability of the sequences to measure implant rotation and dimensions was compared in a TKR knee model. Eleven patients with a variety of metallic hardware were imaged with SEMAC and FSE to compare artifact extent and subsequent patient management was recorded.

RESULTS: SEMAC and MAVRIC significantly reduced artifact extent compared to FSE (P < 0.0001) and were similar to each other (P = 0.58), allowing accurate measurement of implant dimensions and rotation. The TKRs were properly aligned in the volunteers. Clinical imaging with SEMAC in symptomatic knees significantly reduced artifact (P < 0.05) and showed findings that were on the majority confirmed by subsequent noninvasive or invasive patient studies.

CONCLUSION: SEMAC and MAVRIC correct for metal artifact, noninvasively providing high-resolution images with superb bone and soft tissue contrast.

Author List

Chen CA, Chen W, Goodman SB, Hargreaves BA, Koch KM, Lu W, Brau AC, Draper CE, Delp SL, Gold GE

Author

Kevin M. Koch PhD Center Director, Professor in the Radiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Aged
Arthroplasty, Replacement, Knee
Artifacts
Biopsy
Female
Humans
Image Processing, Computer-Assisted
Knee
Magnetic Resonance Imaging
Male
Metals
Middle Aged
Phantoms, Imaging
Prostheses and Implants
Software