Abstract
To explain previously unrecognised consequences of two sources of phase curvature over the vessel cross-section in spiral imaging i.e. off-resonance and the velocity-encoded phase-shift.
Highlights
The effects of off-resonance frequency errors during spiral readouts [Yudilevich and Stark, 1987] are known
Figure 2a) depicts the ideal diametrical phase line profile across a tube velocity-compensated spiral imaging, red line = on-resonance and blue/green lines = phase curvature induced by ±40Hz off-resonance error
In Figure 2b)-green the opposing phase curvatures lead to a cancellation of the radial phase slope at some radius, which can lie outside the true lumen (“explosion” effect, Figure 1-E)
Summary
The effects of off-resonance frequency errors during spiral readouts [Yudilevich and Stark, 1987] are known. In-vivo distortion of through-plane flow by spiral phase-contrast imaging Summary To explain previously unrecognised consequences of two sources of phase curvature over the vessel cross-section in spiral imaging i.e. off-resonance and the velocityencoded phase-shift. Background The effects of off-resonance frequency errors during spiral readouts [Yudilevich and Stark, 1987] are known.
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