Copyright © 1993 by the European Society of Cardiology.
© 1993 The European Society of Cardiology
Magnetic resonance assessment of the pulmonary arterial trunk anatomy, flow, pulsatility and distensibility
The Magnetic Resonance Unit, The Royal Brompton National Heart & Lung Hospital London, U.K.
Received 15 December 1992; revised 6 May 1993; .
Correspondence: Dr R. Paz, Toor Heart Institute, Beilinson Medical Center, 49100 Petah-Tiqva, Israel
Abstract
We used magnetic resonance imaging with cine velocity mapping to study the anatomy of pulmonary bifurcation and to measure volume blood flow, pulsatility of flow and arterial wall distensibility in the central pulmonary arteries of nine healthy volunteers. Multislice, multiplane spin echo images were acquired to display pulmonary bifurcation anatomy. Diameters of the main pulmonary artery (MPA) in systole were 2.56 ± 0.35 cm and in diastole 2.20 ± 0.33 cm. Those of the right pulmonary artery (RPA) were 1.57 ± 0.29 cm and 1.39 ± 0.23 respectively, and of the left pulmonary artery (LPA) 1.79 ± 0.26 cm and 1.55 ± 0.10 cm respectively. A gradient echo sequence with phase shift velocity mapping was then used to measure flow in MPA, RPA and LPA 2 cm on either side of the pulmonary bifurcation. Time averaged flow, calculated from mean velocity and the cross-sectional area of the vessels was 4.99 ± 1.10 l . min–1 in MPA, 2.23 ± 0.58 l . min–1 in RPA and 2.31 ± 0.63 l. min–1 in LPA. The pulsatility index of flow derived from peak forward flow, peak backward flow and time averaged flow were as follows: MPA 4 4 ± 0.8, RPA 5.1 ± 0.6 and LPA 4.6 ± 1.5. Distensibility, calculated from the change in cross-sectional area between diastole and systole and expressed as percentage were as follows: MPA 25.6 ± 10.7, RPA 21.4 ± 10.7 and LPA 24.5 ± 7.8.
MRI with velocity mapping accurately characterized anatomy, flow, distensibility and pulsatility of the central pulmonary arteries.
Key Words: Pulmonary arteries • magnetic resonance • blood flow • distensibility • pulsatility
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