In vivo and in vitro validation of aortic flow quantification by time-resolved three-dimensional velocity-encoded MRI.

The International Journal of Cardiovascular Imaging
Fabian RengierHendrik von Tengg-Kobligk

Abstract

Three-dimensional velocity-encoded cine magnetic resonance imaging (3D VEC MRI) allows for calculation of secondary flow parameters that may be used to estimate prognosis of individual cardiovascular diseases. However, its accuracy has not been fully investigated yet. The purpose of this study was to validate aortic flow quantification by 3D VEC MRI in vitro and in vivo using stacked two-dimensional acquisitions. Time-resolved stacks of two-dimensional planes with three-directional velocity-encoding (stacked-2D-3dir-MRI) were acquired in an elastic tube phantom with pulsatile flow simulating aortic flow as well as in 11 healthy volunteers (23 ± 2 years). Previously validated two-dimensional through-plane VEC MRI at six equidistant levels in vitro and three locations in vivo (ascending aorta/aortic arch/descending aorta) was used as reference standard. The percentage difference of the stacked-2D-3dir-MRI measurement to the reference standard was defined as the parameter for accuracy. For in vitro aortic flow, stacked-2D-3dir-MRI underestimated average velocity by -6.8% (p < 0.001), overestimated average area by 13.6% (p < 0.001), and underestimated average flow by -7.4% (p < 0.001). Accuracy was significantly higher in the field...Continue Reading

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Citations

Apr 17, 2013·The International Journal of Cardiovascular Imaging·Hiram G BezerraErnst E van der Wall

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