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Evaluation of metal artifacts in clinical MR images of patients with total hip arthroplasty using different metal artifact-reducing sequences

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Abstract

Purpose

To evaluate the distortion and artifact area of metal in MR images and to compare artifact reduction using different metal artifact-reducing sequences in patients with metal-on-metal (MoM) and non-MoM total hip prostheses.

Materials and methods

Thirty-six MoM and 15 non-MoM prostheses were examined in a 1.5-T MR scanner using T1-weighted (T1-w) sequences: turbo spin echo (TSE) high-readout bandwidth (hiBW), T1-w; TSE view angle tilting (VAT), T1-w; TSE VAT + slice encoding for metal artifact correction (SEMAC); short tau inversion recovery (STIR) hiBW or matched RF pulses (mRFp). Distortion was quantified using a new method measuring the acetabular roof angle (ARA). The artifact area was defined in the mid-coronal plane of the artifact.

Results

The T1 VAT + SEMAC sequence showed the least distortion compared to T1 VAT and T1-hiBW (150°, 127° and 102°, p < 0.001, in MoM; 152°, 143° and 128°, p ≤ 0.014, in non-MoM). The artifact area was smaller in MoM prostheses using the T1 VAT sequence compared to T1 hiBW and T1 VAT + SEMAC (2506 mm2, 3160 mm2 and 3214 mm2, p < 0.001) and smaller in non-MoM prostheses using T1 VAT compared to T1-hiBW (4296 mm2 and 4831 mm2, p = 0.041). STIR-mRFp substantially reduced the artifact size compared with STIR-hiBW (MoM 4559 mm2 and 6323 mm2; non-MoM 5625 mm2 and 8764 mm2, p < 0.001).

Conclusion

Metal artifacts in MR imaging examinations of hip prostheses can be evaluated for distortion using a distortion angle (ARA) and the degree of signal artifact as determined by measuring the largest cross-sectional artifact area. T1 VAT + SEMAC showed the least distortion; T1 VAT and STIR-mRFp were most efficient for reduction of the artifact area.

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Conflicts of interest

None of the authors has a financial interest.

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Authors and Affiliations

  1. Department of Radiology, Lund University, Skåne University Hospital, Inga Marie Nilssonsgata 49, 20502, Malmö, Sweden

    Gunilla M. Müller, Markus F. Müller & Olle Ekberg

  2. Orthopedic Surgery, Lund University, Skåne University Hospital, Malmö, Sweden

    Thord von Schewelov

  3. Medical Radiation Physics, Lund University, Skåne University Hospital, Malmö, Sweden

    Sven Månsson

  4. Department of Radiology, Lund University, Skåne University Hospital, Lund, Sweden

    Björn Lundin

Authors
  1. Gunilla M. Müller
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  2. Björn Lundin
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  3. Thord von Schewelov
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  4. Markus F. Müller
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  5. Olle Ekberg
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  6. Sven Månsson
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Correspondence to Gunilla M. Müller.

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Müller, G.M., Lundin, B., von Schewelov, T. et al. Evaluation of metal artifacts in clinical MR images of patients with total hip arthroplasty using different metal artifact-reducing sequences. Skeletal Radiol 44, 353–359 (2015). https://doi.org/10.1007/s00256-014-2051-y

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  • DOI: https://doi.org/10.1007/s00256-014-2051-y

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