Velocity-encoded cine (VEC) imaging is potentially an important clinical di
agnostic technique for cardiovascular diseases. Advances in gradient techno
logy combined with segmentation approaches have made possible breathhold VE
C imaging, allowing data to be obtained free of respiratory artifacts. Howe
ver, when using conventional segmentation approaches, spatial and temporal
resolutions are typically compromised to accommodate short breathhold times
. Here we apply a spat-se sampling technique, turbo-BRISK (i.e., segmented
block regional interpolation scheme for k-space) to VEC imaging, allowing i
ncreased spatial and temporal resolution to be obtained in a short breathho
ld period. BRISK is a sparse sampling technique with interpolation used to
generate unsampled data. BRISK was implemented to reduce the scan time by 7
0% compared with a conventional scan. Further; turbo-BRISK scans, using seg
mentation factors up to 5, reduce the scan time by lip to 94%. Phantom and
in vivo results are presented that demonstrate the accuracy of turbo-BRISK
VEC imaging. In vitro validation is performed using conventional magnetic r
esonance VEC. Pulsatile centerline flow velocity measurements obtained with
turbo-BRISK acquisitions were correlated with conventional magnetic resona
nce imaging measurements and achieved r values of 0.99 +/- 0.004 (mean +/-
SD) with stroke volumes agreeing to within 4%. A potential limitation of BR
ISK is reduced accuracy for rapidly varying velocity profiles. We present l
ow- and high-resolution data sets to illustrate the resolution dependence o
f this phenomenon and demonstrate that at conventional resolutions, turbo-B
RISK can accurately, represent rapid velocity changes. In vitro results ind
icate that centerline velocity waveforms in the descending aorta correlate
well with conventional measurements with art average r value of 0.98 +/- 0.
01.