Abstract
SUMMARY: We report on the image quality obtained by using fast contrast-enhanced whole-brain 4D radial MRA with 0.75-second temporal resolution, isotropic submillimeter spatial resolution, and velocity encoding (HYPRFlow). Images generated by HYPR-LR by using the velocity-encoded data as the constraining image were of diagnostic quality. In addition, we demonstrate that measurements of shear stress within the middle cerebral artery can be derived from the high-resolution 3D velocity data.
Abbreviations
- AV
- arteriovenous
- CE-VIPR
- contrast-enhanced VIPR
- HYPR
- highly constrained back-projection
- HYPRFlow
- HYPR with phase contrast as constraint
- HYPR-LR
- HYPR local reconstruction
- MCA
- middle cerebral artery
- MIP
- maximum intensity projection
- MRA
- MR angiography
- PC-VIPR
- phase-contrast VIPR
- SNR
- signal intensity–to-noise ratio
- VIPR
- vastly undersampled isotropic projection reconstruction
- WSS
- wall shear stress
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