title: Novel Metal Artifact Reduction Techniques with Use of Slice-Encoding Metal Artifact Correction and View-Angle Tilting MR Imaging for Improved Visualization of Brain Tissue near Intracranial Aneurysm Clips.
abstract: OBJECTIVE
  The MR image quality after intracranial aneurysm clipping is often impaired because of artifacts induced by metal implants. The purpose of the present study was to evaluate the benefit of a new WARP sequence with slice-encoding metal artifact correction (SEMAC) and view-angle tilting (VAT) MR imaging as novel artifact reduction techniques.
  
  
  METHODS
  A new WARP TSE (a work-in-progress software package provided by Siemens Healthcare) sequence was implemented for cranial applications based on a turbo spin echo (TSE) sequence. T1- and T2-weighted images with standard and WARP TSE sequences were acquired from 6 patients with 11 clipping sites, and the images were compared based on artifact size and general image quality.
  
  
  RESULTS
  T2- and T1-weighted WARP TSE sequences resulted in a highly significant reduction of metal artifacts compared with standard sequences (T2w- WARP TSE: 89.8 ± 1.4 %; T1w- WARP TSE: 84.9 ± 2.9 %; p < 0.001) without a substantial loss of image quality.
  
  
  CONCLUSIONS
  The use of a new WARP TSE sequence after aneurysm clipping is highly beneficial for increasing the diagnostic MR image quality due to a striking reduction of metal artifacts.
authors: Department of Neuroradiology, Klinikum rechts der Isar, Ismaningerstr. 22, 81675, Munich, Germany. benjamin.friedrich@tum.de.|Department of diagnostic and interventional Radiology, University Hospital Leipzig, Leipzig, Germany. benjamin.friedrich@tum.de.
authors: B
authors: B
authors: Friedrich
authors: Department of Neurosurgery, Klinikum rechts der Isar, Munich, Germany.
authors: M
authors: M
authors: Wostrack
authors: Department of Neurosurgery, Klinikum rechts der Isar, Munich, Germany.
authors: F
authors: F
authors: Ringel
authors: Department of Neurosurgery, Klinikum rechts der Isar, Munich, Germany.
authors: Y-M
authors: YM
authors: Ryang
authors: Department of Neuroradiology, Klinikum rechts der Isar, Ismaningerstr. 22, 81675, Munich, Germany.
authors: A
authors: A
authors: Förschler
authors: Department of Radiology, Klinikum rechts der Isar, Munich, Germany.
authors: S
authors: S
authors: Waldt
authors: Department of Neuroradiology, Klinikum rechts der Isar, Ismaningerstr. 22, 81675, Munich, Germany.
authors: C
authors: C
authors: Zimmer
authors: Siemens Healthcare, Erlangen, Germany.
authors: M
authors: M
authors: Nittka
authors: Department of Neuroradiology, Klinikum rechts der Isar, Ismaningerstr. 22, 81675, Munich, Germany.
authors: C
authors: C
authors: Preibisch
mesh_terms: D000328:Adult; D000368:Aged; D000465:Algorithms; D016477:Artifacts; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000601:surgery*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008670:Metals; D008875:Middle Aged; D056888:Patient Positioning; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012984:Software
chemical_list: D008670:Metals
keywords: Artifact; Clip; MRI; SEMAC; WARP