title: Metal artifact reduction with MAVRIC SL at 3-T MRI in patients with hip arthroplasty.
abstract: OBJECTIVE
  The objective of our study was to compare the multiacquisition variable-resonance image combination selective (MAVRIC SL) sequence with the 2D fast spin-echo (FSE) sequence for metal artifact reduction on 3-T MRI in patients with hip arthroplasty (HA).
  
  
  METHODS
  Matched 2D FSE and MAVRIC SL images of 21 hips (19 patients with HA) were included in the study group. Paired image sets, composed of 13 coronal and 12 axial slices (total, 25 image sets), of the 21 hips were evaluated. For quantitative analysis, the artifact area was measured at the level of the hip and femur. For qualitative analysis, two musculoskeletal radiologists independently compared paired 2D FSE and MAVRIC SL sets in terms of artifacts, depiction of anatomic detail, level of diagnostic confidence, and detection of abnormal findings.
  
  
  RESULTS
  The measured artifact area was significantly smaller (p < 0.05) on MAVRIC SL than 2D FSE at both the level of hip (59.9% reduction with MAVRIC SL) and femur (31.3% reduction with MAVRIC SL). The artifact score was also significantly decreased (p < 0.0001) with MAVRIC SL compared with 2D FSE for both reviewers. The hip joint capsule and the muscle and tendon attachment sites of the obturator externus and iliopsoas muscles were better depicted with MAVRIC SL than 2D FSE (p < 0.0125). Abnormal findings were significantly better shown on MAVRIC SL imaging compared with 2D FSE imaging (p < 0.0001).
  
  
  CONCLUSIONS
  The MAVRIC SL sequence can significantly reduce metal artifact on 3-T MRI compared with the 2D FSE sequence and can increase diagnostic confidence of 3-T MRI in patients with total HA.
authors.affiliation: 1 Department of Radiology, Asan Foundation, Gangneung Asan Hospital, University of Ulsan, College of Medicine, Gangneung-si, Gangwon-do, Korea.
authors.forename: Soo-Jung
authors.initials: SJ
authors.lastname: Choi
authors.forename: Kevin M
authors.initials: KM
authors.lastname: Koch
authors.forename: Brian A
authors.initials: BA
authors.lastname: Hargreaves
authors.forename: Kathryn J
authors.initials: KJ
authors.lastname: Stevens
authors.forename: Garry E
authors.initials: GE
authors.lastname: Gold
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D016477:Artifacts; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008670:Metals; D008875:Middle Aged; D015588:Observer Variation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D008670:Metals
keywords: MR artifact; MRI; arthroplasty; hip