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Abstract #1993

Vortex Formation Time in Chinese Children: a CMR Study

Liwei Hu1, Rongzhen Ouyang2, Yafeng Peng1, Chen Guo1, Yong Zhang3, Xiaofen Yao2, Yumin Zhong2, and Christopher J Fran├žois4

1Radiology, Shanghai Children's Medical Center, Shanghai, China, 2Shanghai Children's Medical Center, Shanghai, China, 3MR Research GE Healthcare, Shanghai, China, 4Radiology, University of Wisconsin-Madison, Madison, WI, United States

Vortex formation time (VFT) is an index of left ventricular (LV) systolic and diastolic performance, with normal values, based on echocardiography, from 3.3 to 5.5 ms in adults [1]. With the increasing intensity of vortex, the vortex ring is pinched off; this instant is defined as the vortex ring formation time. With echocardiography VFT is measured from trans-mitral inflow velocities. Although cardiovascular magnetic resonance (CMR) is the gold standard for assessing LV systolic function, its use in evaluating LV diastolic function is more limited [2]. Through-plane motion of the mitral valve results in underestimations of the peak mitral inflow velocities with standard 2D flow CMR acquisitions. 4D flow CMR analysis improves the accuracy of peak mitral inflow velocities because of its ability to track mitral valve plane motion [3]. However, vortex ring quantification with 4D flow CMR has not been widely used [4]. The VFT has not been evaluated in children and could be useful tools for assessment of diastolic function using CMR.

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