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Abstract #1337

Are There General Protocol Parameters to Reduce Velocity Offsets? a Multi-Vendor Study.

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.