title: Wavelet-space correlation imaging for high-speed MRI without motion monitoring or data segmentation.
abstract: OBJECTIVE
  This study aims to (i) develop a new high-speed MRI approach by implementing correlation imaging in wavelet-space, and (ii) demonstrate the ability of wavelet-space correlation imaging to image human anatomy with involuntary or physiological motion.
  
  
  METHODS
  Correlation imaging is a high-speed MRI framework in which image reconstruction relies on quantification of data correlation. The presented work integrates correlation imaging with a wavelet transform technique developed originally in the field of signal and image processing. This provides a new high-speed MRI approach to motion-free data collection without motion monitoring or data segmentation. The new approach, called "wavelet-space correlation imaging", is investigated in brain imaging with involuntary motion and chest imaging with free-breathing.
  
  
  RESULTS
  Wavelet-space correlation imaging can exceed the speed limit of conventional parallel imaging methods. Using this approach with high acceleration factors (6 for brain MRI, 16 for cardiac MRI, and 8 for lung MRI), motion-free images can be generated in static brain MRI with involuntary motion and nonsegmented dynamic cardiac/lung MRI with free-breathing.
  
  
  CONCLUSIONS
  Wavelet-space correlation imaging enables high-speed MRI in the presence of involuntary motion or physiological dynamics without motion monitoring or data segmentation.
authors.affiliation: Imaging Research Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.affiliation: Imaging Research Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.affiliation: Imaging Research Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
authors.forename: Jean
authors.initials: J
authors.lastname: Tkach
authors.affiliation: Imaging Research Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
authors.forename: David
authors.initials: D
authors.lastname: Roach
authors.affiliation: Imaging Research Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
authors.forename: Jason
authors.initials: J
authors.lastname: Woods
authors.affiliation: Imaging Research Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
authors.forename: Charles
authors.initials: C
authors.lastname: Dumoulin
mesh_terms: D000465:Algorithms; D016477:Artifacts; D001921:Brain / Q000033:anatomy & histology; D006321:Heart / Q000033:anatomy & histology; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008168:Lung / Q000033:anatomy & histology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009038:Motion; D015203:Reproducibility of Results; D018401:Sample Size; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013223:Statistics as Topic; D058067:Wavelet Analysis
keywords: correlation imaging; data correlation function; high-speed MRI