Marijn P. Rolf1, Mark B.M. Hofman1,
Peter D. Gatehouse2, Karin Markenroth Bloch3, Martin J.
Graves4, Albert C. van Rossum5, Philip Kilner2,
Rob M. Heethaar1
1Physics and Medical Technology,
ICaR-VU, VU University Medical Center, Amsterdam, Netherlands; 2Cardiovascular
Magnetic Resonance Unit, Royal Brompton Hospital, London, United Kingdom; 3Philips
Healthcare, Lund University Hospital, Lund, Sweden; 4Department of
Radiology, Addenbrooke's Hospital, Cambridge, United Kingdom; 5Department
of Cardiology, ICaR-VU, VU University Medical Center, Amsterdam, Netherlands
Velocity
offsets are of great concern for accuracy in cardiovascular flow
quantification measurements. General protocol parameters (gradient speed,
read-out bandwidth, partial echo, venc, and slice thickness) were studied
across several MR-scanners of different vendors to investigate whether there
is a general rule by which volume flow quantification protocols can be
optimized in order to reduce velocity offsets. Gradient speed and partial
echo showed a clear effect on the velocity offsets but not across all
vendors. Slice orientation was found to be of major influence across all
scanners, oblique slices generally gave higher offsets.