title: UltraFast Doppler ultrasonography for hepatic vessels of liver recipients: preliminary experiences.
abstract: OBJECTIVE
  The purpose of this study was to investigate the value of UltraFast Doppler ultrasonography (US) for evaluating hepatic vessels in liver recipients.
  
  
  METHODS
  Thirty-nine liver Doppler US sessions were conducted in 20 liver recipients. Each session consisted of UltraFast and conventional liver Doppler US in a random order. We compared the velocities and phasicities of the hepatic vessels, duration of each Doppler study, occurrence of technical failures, and differences in clinical decisions.
  
  
  RESULTS
  The velocities and resistive index values of hepatic vessels showed a strong positive correlation between the two Doppler studies (mean R=0.806; range, 0.710 to 0.924). The phasicities of the hepatic vessels were the same in both Doppler US exams. With respect to the duration of the Doppler US exam, there was no significant difference between the UltraFast (251±99 seconds) and conventional (231±117 seconds) Doppler studies (P=0.306). In five poor breath-holders, in whom the duration of conventional Doppler US was longer, UltraFast Doppler US (272±157 seconds) required a shorter time than conventional Doppler US (381±133 seconds; P=0.005). There was no difference between the two techniques with respect to technical failures and clinical decisions.
  
  
  CONCLUSIONS
  UltraFast Doppler US is clinically equivalent to conventional Doppler US with advantages for poor breath-holders during the post-liver transplantation work-up.
authors.affiliation: Department of Radiology, SMG-SNU Boramae Medical Center, Seoul National University Hospital, Seoul, Korea.
authors.forename: Bo Yun
authors.identifier: 0000-0001-6549-6076
authors.initials: BY
authors.lastname: Hur
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul, Korea ; Department of Institute of Radiation Medicine, Seoul National University Hospital, Seoul, Korea.
authors.forename: Jae Young
authors.identifier: 0000-0001-6946-6042
authors.initials: JY
authors.lastname: Lee
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul, Korea.
authors.forename: A Jung
authors.identifier: 0000-0003-2018-6706
authors.initials: AJ
authors.lastname: Chu
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul, Korea ; Department of Institute of Radiation Medicine, Seoul National University Hospital, Seoul, Korea.
authors.forename: Se Hyung
authors.identifier: 0000-0001-8664-0356
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul, Korea ; Department of Institute of Radiation Medicine, Seoul National University Hospital, Seoul, Korea.
authors.forename: Joon Koo
authors.identifier: 0000-0001-5916-5545
authors.initials: JK
authors.lastname: Han
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul, Korea ; Department of Institute of Radiation Medicine, Seoul National University Hospital, Seoul, Korea.
authors.forename: Byung Ihn
authors.identifier: 0000-0002-5613-1881
authors.initials: BI
authors.lastname: Choi
keywords: Doppler ultrasonography; Liver; Liver transplantation