TY - JOUR
T1 - Advanced metal artifact reduction MRI of metal-on-metal hip resurfacing arthroplasty implants
T2 - compressed sensing acceleration enables the time-neutral use of SEMAC
AU - Fritz, Jan
AU - Fritz, Benjamin
AU - Thawait, Gaurav K.
AU - Raithel, Esther
AU - Gilson, Wesley D.
AU - Nittka, Mathias
AU - Mont, Michael A.
N1 - Publisher Copyright:
© 2016, ISS.
PY - 2016/10/1
Y1 - 2016/10/1
N2 - 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.
AB - 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.
KW - Compressed sensing
KW - Hip
KW - MARS
KW - MRI
KW - Metal-on-metal
KW - Resurfacing arthroplasty
KW - SEMAC
KW - Sparsity
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U2 - 10.1007/s00256-016-2437-0
DO - 10.1007/s00256-016-2437-0
M3 - Article
C2 - 27497594
AN - SCOPUS:84982903320
SN - 0364-2348
VL - 45
SP - 1345
EP - 1356
JO - Skeletal Radiology
JF - Skeletal Radiology
IS - 10
ER -