title: Aliasing artifacts with the BLADE technique: causes and effective suppression.
abstract: OBJECTIVE
  To elucidate the causes of aliasing artifacts with the BLADE technique and clarify the effective suppression methods.
  
  
  METHODS
  We separately observed the aliasing artifacts of BLADE from features inside and then outside the defined field-of-view (FOV) using phantom studies. The effectiveness of suppressing them with phase oversampling (POS) and presaturation pulses (SAT) was evaluated. Finally, our observations were confirmed for a healthy volunteer.
  
  
  RESULTS
  Characteristic aliasing artifacts were observed from both inside and outside the FOV. Those from inside the FOV were sufficiently suppressed by using a POS of 25%, considering the acquisition time prolongation. Those from outside the FOV were nearly suppressed using SAT outside the FOV without selecting needless receiver coils. Aliasing artifacts on the coronal images of the head and neck with a healthy volunteer were completely suppressed by a combination of using a POS of 25% and using SAT on all four sides outside the FOV.
  
  
  CONCLUSIONS
  The characteristic aliasing artifacts of BLADE are caused from both inside and outside the defined FOV. They can be effectively suppressed by a combination of using a POS of 25% and using SAT on all four sides outside the FOV.
authors.affiliation: Department of Radiology, Tokyo Women's Medical University Medical Center East, Tokyo, Japan. yancy123xyz@nifty.com
authors.forename: Shinya
authors.initials: S
authors.lastname: Kojima
authors.forename: Satoru
authors.initials: S
authors.lastname: Morita
authors.forename: Eiko
authors.initials: E
authors.lastname: Ueno
authors.forename: Masami
authors.initials: M
authors.lastname: Hirata
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Shinohara
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Komori
mesh_terms: D000328:Adult; D000465:Algorithms; D016477:Artifacts; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity