title: Single-frequency excitation wideband MRI (SE-WMRI).
abstract: OBJECTIVE
  In this study, single-frequency excitation wideband magnetic resonance imaging (MRI) (SE-WMRI) was proposed to obtain high-quality accelerated images by reducing phase-encoding steps while applying separation gradients.
  
  
  METHODS
  A zig-zag k-space trajectory with reduced phase-encoding steps and an increased readout sampling rate was proposed. A unique gradient design with buffer intervals near the trajectory turns was employed to avoid undersampling and image artifacts. A gridding method and Fourier transform were used for image reconstruction. Quantitative analysis was performed on phantom images to investigate the characteristics of the acceleration method.
  
  
  RESULTS
  The proposed method showed evident improvements in the accelerated phantom images, substantially reducing the ringing and blurring artifacts found using previous methods. Furthermore, the accelerated images exhibited the same signal-to-noise ratio as standard imaging. The accelerated in vivo experiment also produced the same quality as standard imaging.
  
  
  CONCLUSIONS
  The proposed SE-WMRI method can effectively remove image artifacts and acquire images of higher temporal or spatial resolutions with less compromise.
authors.affiliation: Institute of Biomedical Engineering, National Taiwan University, Taipei 106, Taiwan and MRI/MRS Interdisciplinary Laboratory, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Edzer L
authors.initials: EL
authors.lastname: Wu
authors.affiliation: MRI/MRS Interdisciplinary Laboratory, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Yun-An
authors.initials: YA
authors.lastname: Huang
authors.affiliation: Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Tzi-Dar
authors.initials: TD
authors.lastname: Chiueh
authors.affiliation: Institute of Biomedical Engineering, National Taiwan University, Taipei 106, Taiwan; Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan; and MRI/MRS Interdisciplinary Laboratory, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Jyh-Horng
authors.initials: JH
authors.lastname: Chen
mesh_terms: D000818:Animals; D016477:Artifacts; D005121:Extremities / Q000033:anatomy & histology; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D019047:Phantoms, Imaging; D051381:Rats; D013131:Spine / Q000033:anatomy & histology; D013552:Swine