A novel approach to phase-contrast velocity offset correction by in vivo high-SNR acquisitions
© Fair et al; licensee BioMed Central Ltd. 2013
Published: 30 January 2013
Baseline offset errors on phase-contrast velocity images can be corrected using stationary tissue, for example subtracting fitted corrections from the image (1). Although corrections are often curved over the FOV, 1st order (linear) fitting is typical. This may partly be due to low SNR of static tissue making higher-order fitting unreliable (2). Aim: To evaluate a new method acquiring additional high SNR velocity images specifically to improve offset correction.
Discussion & Conclusions: The new high-SNR method improved fitting of higher order surfaces for offset correction, but with marginal improvement of accuracy. For some protocols and scanners with larger uncorrected offsets and/or lower SNR in the clinical flow study, this method might have more impact. The reduced stdev implies that this new method may improve reliability. However, with this data the improved accuracy of correction was insufficient to justify the extra breath-hold with each phase-contrast scan.
Cardiovascular Biomedical Research Unit funding from the National Institute for Health Research.
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