Advanced metal artifact reduction MRI of metal-on-metal hip resurfacing arthroplasty implants: compressed sensing acceleration enables the time-neutral use of SEMAC

Jan Fritz, Benjamin Fritz, Gaurav Thawait, Esther Raithel, Wesley D. Gilson, Mathias Nittka, Michael A. Mont

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: Compressed sensing (CS) acceleration has been theorized for slice encoding for metal artifact correction (SEMAC), but has not been shown to be feasible. Therefore, we tested the hypothesis that CS-SEMAC is feasible for MRI of metal-on-metal hip resurfacing implants. Materials and methods: Following prospective institutional review board approval, 22 subjects with metal-on-metal hip resurfacing implants underwent 1.5 T MRI. We compared CS-SEMAC prototype, high-bandwidth TSE, and SEMAC sequences with acquisition times of 4–5, 4–5 and 10–12 min, respectively. Outcome measures included bone-implant interfaces, image quality, periprosthetic structures, artifact size, and signal- and contrast-to-noise ratios (SNR and CNR). Using Friedman, repeated measures analysis of variances, and Cohen’s weighted kappa tests, Bonferroni-corrected p-values of 0.005 and less were considered statistically significant. Results: There was no statistical difference of outcomes measures of SEMAC and CS-SEMAC images. Visibility of implant-bone interfaces and pseudocapsule as well as fat suppression and metal reduction were “adequate” to “good” on CS-SEMAC and “non-diagnostic” to “adequate” on high-BW TSE (p < 0.001, respectively). SEMAC and CS-SEMAC showed mild blur and ripple artifacts. The metal artifact size was 63 % larger for high-BW TSE as compared to SEMAC and CS-SEMAC (p < 0.0001, respectively). CNRs were sufficiently high and statistically similar, with the exception of CNR of fluid and muscle and CNR of fluid and tendon, which were higher on intermediate-weighted high-BW TSE (p < 0.005, respectively). Conclusion: Compressed sensing acceleration enables the time-neutral use of SEMAC for MRI of metal-on-metal hip resurfacing implants when compared to high-BW TSE and image quality similar to conventional SEMAC.

Original languageEnglish (US)
Pages (from-to)1345-1356
Number of pages12
JournalSkeletal Radiology
Volume45
Issue number10
DOIs
StatePublished - Oct 1 2016

Keywords

  • Compressed sensing
  • Hip
  • MARS
  • Metal-on-metal
  • MRI
  • Resurfacing arthroplasty
  • SEMAC
  • Sparsity

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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