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Abstract #2744

Effects of Temporal Resolution and Velocity Encoding Strategies on Aortic Flow Measurement with Two-Dimensional Phase-Contrast MRI

Can Wu 1,2 , Susanne Schnell 2 , and Michael Markl 1,2

1 Biomedical Engineering, Northwestern University, Chicago, Illinois, United States, 2 Radiology, Northwestern University, Chicago, Illinois, United States

The purpose of this study was to systematically investigate the effects of temporal resolution and different velocity encoding strategies on aortic flow quantification. 2D phase-contrast MRI was performed in 15 volunteers with three different velocity encoding schemes (i.e. single-directional through-plane, interleaved and sequential three-directional velocity encoding). The results demonstrated that high temporal resolution (e.g. ~5ms) may be required for accurately measuring aortic peak velocities and relatively low temporal resolution (~20ms) can be used for aortic blood flow quantification. In addition, aortic peak velocities were underestimated with single-directional velocity encoding compared with 3-directional velocity encoding.

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