Abstract
Background In patients with congenital heart disease (CHD), it is desirable to accurately measure peak velocity (Vmax). Unfortunately, phase-contrast 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. Therefore, we have developed a FVE sequence that combines spiral trajectories with parallel imaging (SENSE), partial-Fourier acquisition and a novel velocity-unwrap technique. The aim of this study is to validate this sequence.
Highlights
In patients with congenital heart disease (CHD), it is desirable to accurately measure peak velocity (Vmax)
Peak velocity measurements using the following techniques were compared at 15 different flow rates; 1) US doppler, 2) low-resolution phase-contrast MR (PCMR), 3) high-resolution PCMR, 4) Fourier Velocity Encoding (FVE)
In-vitro: There were no statistically significant differences between Vmax measured using US and FVE. Both PCMR sequences showed a statistically significant underestimation of peak flow compared to US
Summary
In patients with congenital heart disease (CHD), it is desirable to accurately measure peak velocity (Vmax). Phase-contrast 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), partial-Fourier acquisition and a novel velocity-unwrap technique. The aim of this study is to validate this sequence
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