Abstract
Quantification of peak velocity is important in the assessment of stenotic flow jets. It is possible to measure peak velocity accurately using Fourier Velocity Encoding (FVE). In this study, a fast, high-resolution slice-selective FVE sequence was developed with the use of spiral trajectories, parallel-imaging, partial-Fourier in the velocity-dimension and a novel velocity-unwrap technique. The resulting sequence was acquired within a short breath-hold. Peak velocities were compared from Doppler ultrasound (US), phase-contrast MR (PCMR) and FVE. Experiments carried out in-vitro and in-vivo showed that PCMR tended to underestimate peak velocity compared to Doppler US, whereas FVE agreed well with Doppler US.
Highlights
In patients with stenoses, it is desirable to accurately measure peak velocity (Vmax)
We have developed a Fourier Velocity Encoding (FVE) sequence that combines spiral trajectories with parallel imaging (SENSE), partialFourier acquisition and a novel velocity-unwrap technique
There were no statistical differences between Vmax measured using US and FVE sequences
Summary
It is desirable to accurately measure peak velocity (Vmax). Phasecontrast MR (PCMR) tends to underestimate peak velocities. Fourier Velocity Encoding (FVE) can measure peak velocities in MRI, but is not commonly used due to long acquisition times. We have developed a FVE sequence that combines spiral trajectories with parallel imaging (SENSE), partialFourier acquisition and a novel velocity-unwrap technique. The aim of this study is to validate this sequence
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