title: Fast, variable system delay correction for spiral MRI.
abstract: OBJECTIVE
  Time-varying system delays and eddy currents can substantially reduce the image quality of spiral images. A new method is proposed to estimate variable system delays for spiral-based trajectories.
  
  
  METHODS
  This approach requires a minor modification of a conventional stack-of-spirals sequence and analyzes data collected on three overlapping orthogonal cylinders.
  
  
  RESULTS
  Initial results are presented for acquired and synthesized phantom data and in vivo data.
  
  
  CONCLUSIONS
  The proposed method includes gradient coupling effects, requires no phantom measurements or specialized hardware, is robust to off-resonance effects, and estimates independent continuous delays for each gradient channel over the data-sampling period.
authors.affiliation: Keller Center for Imaging Innovation, Barrow Neurological Institute, Phoenix, Arizona, USA.
authors.forename: Payal S
authors.initials: PS
authors.lastname: Bhavsar
authors.forename: Nicholas R
authors.initials: NR
authors.lastname: Zwart
authors.forename: James G
authors.initials: JG
authors.lastname: Pipe
mesh_terms: D000465:Algorithms; D016477:Artifacts; D001921:Brain / Q000033:anatomy & histology*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted