Fig 1.

HYPRFlow image reconstruction. Top row: 60 whole-brain 3D radial scans are obtained every 0.5 seconds and reconstructed by using a 0.75-second acquisition window during the first passage of the contrast bolus. Four scans are displayed from this time-series (3D CE-VIPR timeframes). Top right: following the dynamic scan, a 3D radial phase-contrast MRA is obtained (5-minute PC-VIPR MRA used as the vascular constraint). Middle row: temporal weighting images are produced by using a low-pass filter. Bottom row: HYPR LR multiplication and reconstruction are performed by using the phase-contrast angiographic data to constrain the dynamic weighting images. Four HYPRFlow images from the 60-image time-series are displayed, demonstrating improved SNR and spatial resolution following HYPR LR reconstruction.