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

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• 作者：Gunilla M. Müller ; Bj?rn Lundin ; Thord von Schewelov…
• 关键词：MR imaging ; Metal artifact ; reducing sequences (MARS) ; Metal artifact ; Hip ; Hip prosthesis ; Artifact measurement ; Image distortion
• 刊名：Skeletal Radiology
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：44
• 期：3
• 页码：353-359
• 全文大小：1,898 KB
• 参考文献：1. Hargreaves BA, Worters PW, Pauly KB, Pauly JM, Koch KM, Gold GE. Metal-induced artifacts in MRI. AJR Am J Roentgenol. 2011;197:547-5. CrossRef
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• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Imaging and Radiology
  Orthopedics
  Pathology
  Nuclear Medicine
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2161

文摘

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--.001, in MoM; 152°, 143° and 128°, p?≤-.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--.001) and smaller in non-MoM prostheses using T1 VAT compared to T1-hiBW (4296?mm2 and 4831?mm2, p--.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--.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.