title: [Contrastive analysis of artifacts produced by metal dental crowns in 3.0 T magnetic resonance imaging with six sequences].
abstract: OBJECTIVE
  This study aimed to observe and evaluate six 3.0 T sequences of metallic artifacts produced by metal dental crowns.
  
  
  METHODS
  Dental crowns fabricated with four different materials (Co-Gr, Ni-Gr, Ti alloy and pure Ti) were evaluated. A mature crossbreed dog was used as the experimental animal, and crowns were fabricated for its upper right second premolar. Each crown was examined through head MRI (3.0 T) with six sequences, namely, T₁ weighted-imaging of spin echo (T₁W/SE), T₂ weighted-imaging of inversion recovery (T₂W/IR), T₂ star gradient echo (T₂*/GRE), T2 weighted-imaging of fast spin echo (T₂W/FSE), T₁ weighted-imaging of fluid attenuate inversion recovery (T₂W/FLAIR), and T₂ weighted-imaging of propeller (T₂W/PROP). The largest area and layers of artifacts were assessed and compared.
  
  
  RESULTS
  The artifact in the T₂*/GRE sequence was significantly wider than those in the other sequences (P < 0.01), whose artifact extent was not significantly different (P > 0.05).
  
  
  CONCLUSIONS
  T₂*/GRE exhibit the strongest influence on the artifact, whereas the five other sequences contribute equally to artifact generation.
authors.forename: Gao
authors.initials: G
authors.lastname: Lan
authors.forename: Lian
authors.initials: L
authors.lastname: Yunmin
authors.forename: Wang
authors.initials: W
authors.lastname: Pu
authors.forename: Huai
authors.initials: H
authors.lastname: Haili
mesh_terms: D000497:Alloys; D000818:Animals; D016477:Artifacts; D003442:Crowns; D004285:Dogs; D008279:Magnetic Resonance Imaging; D014025:Titanium
chemical_list: D000497:Alloys; D014025:Titanium