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

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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