MR measurement of blood flow in the true and false channel in chronic aortic dissection

J. M. Chang, K. Friese, G. R. Caputo, C. Kondo, C. B. Higgins

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Velocity encoded (VEC) cine MR imaging is a new noninvasive technique for the quantification of blood flow velocity in the cardiovascular system. Six patients with type B aortic dissection underwent VEC cine MR imaging at 1.5 T. This technique provides cine MR magnitude and VEC phase images at ~16 equally spaced intervals during an average cardiac cycle. A region of interest encompassing a vascular structure, i.e., false channel, provides a spatially averaged velocity for the time interval at which the image was acquired. Interpretation of velocity values from the 16 intervals during the cardiac cycle provides a temporally average velocity. Velocity mapping across the aortic lumen in these six cases showed average spatial and temporal velocity of 13.4 ± 1.49 cm/s in the true channel and 3.1 ± 0.84 cm/s in the false channel (p < 0.05). The peak systolic velocity (temporal peak) was 43.6 ± 7.20 cm/s in the true channel and 14.3 ± 2.30 cm/s in the false channel (p < 0.05). The flow volume per cardiac cycle was not significantly different between the ture (23.1 ± 5.04 ml/cycle) and false channel (27.1 ± 10.14 ml/cycle). There was substantial retrograde flow in the false channel of two patients. The intraobserver and interobserver variability was <10% (r = 0.98 to 0.99) for the measurement of flow parameters in both the true and the false channel. We conclude that VEC cine MR imaging demonstrates substantial differences in the hemodynamic pattern in the true and false channel in aortic dissection.

Original languageEnglish (US)
Pages (from-to)418-423
Number of pages6
JournalJournal of Computer Assisted Tomography
Issue number3
StatePublished - 1991


  • Aorta
  • Blood
  • Cine MR
  • Dissection
  • Flow dynamics
  • Heart
  • Magnetic resonance imaging
  • Magnetic resonance imaging
  • Techniques

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology


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