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.