title: Value of blood flow velocity on color Doppler ultrasonography for optimization of delay in scanning time on computed tomography venography in patients with Budd-Chiari syndrome and inferior vena cava obstruction.
abstract: OBJECTIVE
  To prospectively determine the value of blood flow velocity in the inferior vena cava (IVC) on color Doppler ultrasonography for the optimization of the delay in scanning time after contrast injection during computed tomography (CT) venography in patients with Budd-Chiari syndrome (BCS) with IVC obstruction.
  
  
  METHODS
  We enrolled 122 consecutive BCS patients with IVC obstruction. All patients underwent color Doppler ultrasonography, CT venography, and digital subtraction angiography (DSA) in that order prior to treatment. The delay in scanning time during CT venography was set at 120, 180, 240, and 300 s after contrast injection. The correlation between delay in CT scanning and IVC blood flow velocity on color Doppler ultrasonography was explored. Image quality was classified as good, moderate, or poor. Patients with good CT image quality were considered to have an optimal delay in scanning time.
  
  
  RESULTS
  Delays in scanning time of 120, 180, 240, and 300 s yielded good-quality images in 2, 7, 49, and 64 patients, respectively. The corresponding IVC blood flow velocities in these patients were 16.10 ± 0.42 cm/s (range 15.8-16.4 cm/s), 12.90 ± 1.58 cm/s (range, 11-15 cm/s), 7.53 ± 1.35 cm/s (range 5-10 cm/s), and 1.95 ± 1.75 cm/s (range 0-5.5 cm/s).
  
  
  CONCLUSIONS
  IVC blood flow velocity on color Doppler ultrasonography could serve as a useful tool for the optimization of the delay in scanning time during CT venography to ensure good-quality images for the diagnosis of BCS with IVC obstruction.
authors.affiliation: Department of Interventional Radiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan, China.
authors.forename: Peng-Li
authors.initials: PL
authors.lastname: Zhou
authors.affiliation: Department of Interventional Radiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Yan
authors.affiliation: Department of Interventional Radiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Wu
authors.affiliation: Department of Interventional Radiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan, China. hanxinwei2006@163.com.|, No.1, East Jian She Road, Zhengzhou, 450052, Henan, China. hanxinwei2006@163.com.
authors.forename: Xin-Wei
authors.initials: XW
authors.lastname: Han
authors.affiliation: Department of Interventional Radiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan, China.
authors.forename: Wen-Guang
authors.initials: WG
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity; D006502:Budd-Chiari Syndrome / Q000503:physiopathology*; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010690:Phlebography / Q000379:methods; D011446:Prospective Studies; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D018615:Ultrasonography, Doppler, Color; D014682:Vena Cava, Inferior / Q000002:abnormalities / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D055815:Young Adult
keywords: Budd–Chiari syndrome; Color Doppler ultrasonography; Computed tomography (CT); Inferior vena cava (IVC); Velocity