title: Feasibility of 3D navigator-triggered magnetic resonance cholangiopancreatography with combined parallel imaging and compressed sensing reconstruction at 3T.
abstract: To assess the feasibility of 3D navigator-triggered magnetic resonance cholangiopancreatography (MRCP) with combined parallel imaging (PI) and compressed sensing (CS).
  
  
  
  With Institutional Review Board approval, 30 consecutive patients who underwent MRCP for suspected pancreaticobiliary disease were prospectively recruited. All patients underwent 3D navigator-triggered MRCP with conventional PI alone, and with combined PI and CS using a 3T machine. The acquisition time and relative duct-to-periductal contrast ratios (RCs) at three biliary segments were quantitatively compared between the two MRCP methods. Qualitative image parameters were independently evaluated by two blinded radiologists, and were compared between two methods using the Wilcoxon signed-rank test.
  
  
  
  The mean acquisition time of MRCP with combined PI and CS (131.87 ± 33.60 sec) was significantly shorter compared with that of MRCP with PI (253.63 ± 56.08 sec; P < 0.001). The RC obtained using MRCP with combined PI and CS at two segments was slightly lower compared to that obtained using MRCP with PI (P = 0.007 and 0.002). Both reviewers found no significant differences in duct visualization, overall image quality, and degree of artifacts between the two methods (P ≥ 0.063; P = 0.637; and P = 0.752, respectively). Lesion conspicuity and confidence in duct abnormalities were comparable between two MRCP methods in both readers (P = 0.564 and P > 0.999).
  
  
  
  Combined PI and CS reconstruction is feasible for 3D navigator-triggered MRCP, providing image quality comparable to that of MRCP with PI alone, in about half the acquisition time.
  
  
  
  2 Technical Efficacy: Stage 1 J. Magn. Reson. Imaging 2017;46:1289-1297.
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Nieun
authors.initials: N
authors.lastname: Seo
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Mi-Suk
authors.initials: MS
authors.lastname: Park
authors.affiliation: Department of Radiology, Yonsei Biomedical Research Institute, Research Institute of Radiological Science, Seoul, Korea.
authors.forename: Kyunghwa
authors.initials: K
authors.lastname: Han
authors.affiliation: GE Healthcare, Seoul, South Korea.
authors.forename: Dongeun
authors.initials: D
authors.lastname: Kim
authors.affiliation: GE Healthcare, Waukesha, Wisconsin, USA.
authors.forename: Kevin F
authors.initials: KF
authors.lastname: King
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Jin-Young
authors.initials: JY
authors.lastname: Choi
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Honsoul
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Minsu
authors.initials: M
authors.lastname: Lee
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Heejin
authors.initials: H
authors.lastname: Bae
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Myeong-Jin
authors.initials: MJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D049448:Cholangiopancreatography, Magnetic Resonance / Q000379:methods*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011871:Radiology / Q000379:methods; D015203:Reproducibility of Results
keywords: MRCP; compressed sensing; navigator-triggered; parallel imaging