Skip to main content

Flow measurement by cardiovascular magnetic resonance: a multi-centre multi-vendor study of background phase offset errors that can compromise the accuracy of derived regurgitant or shunt flow measurements.

Gatehouse, P.D., Rolf, M.P., Graves, M.J., Hofman, M.B., Totman, J., Werner, B., Quest, R.A., Liu, Y., von Spiczak, J., Dieringer, M., Firmin, D.N., van Rossum, A., Lombardi, M., Schwitter, J., Schulz-Menger, J. and Kilner, P.J., 2010. Flow measurement by cardiovascular magnetic resonance: a multi-centre multi-vendor study of background phase offset errors that can compromise the accuracy of derived regurgitant or shunt flow measurements. Journal of Cardiovascular Magnetic Resonance, 12 (1), 5.

Full text available as:

[img]
Preview
PDF (OPEN ACCESS ARTICLE)
Flow measurement by cardiovascular magnetic resonance a multi-centre multi-vendor study of background phase offset errors th.pdf - Published Version
Available under License Creative Commons Attribution.

1MB

DOI: 10.1186/1532-429X-12-5

Abstract

AIMS: Cardiovascular magnetic resonance (CMR) allows non-invasive phase contrast measurements of flow through planes transecting large vessels. However, some clinically valuable applications are highly sensitive to errors caused by small offsets of measured velocities if these are not adequately corrected, for example by the use of static tissue or static phantom correction of the offset error. We studied the severity of uncorrected velocity offset errors across sites and CMR systems. METHODS AND RESULTS: In a multi-centre, multi-vendor study, breath-hold through-plane retrospectively ECG-gated phase contrast acquisitions, as are used clinically for aortic and pulmonary flow measurement, were applied to static gelatin phantoms in twelve 1.5 T CMR systems, using a velocity encoding range of 150 cm/s. No post-processing corrections of offsets were implemented. The greatest uncorrected velocity offset, taken as an average over a 'great vessel' region (30 mm diameter) located up to 70 mm in-plane distance from the magnet isocenter, ranged from 0.4 cm/s to 4.9 cm/s. It averaged 2.7 cm/s over all the planes and systems. By theoretical calculation, a velocity offset error of 0.6 cm/s (representing just 0.4% of a 150 cm/s velocity encoding range) is barely acceptable, potentially causing about 5% miscalculation of cardiac output and up to 10% error in shunt measurement. CONCLUSION: In the absence of hardware or software upgrades able to reduce phase offset errors, all the systems tested appeared to require post-acquisition correction to achieve consistently reliable breath-hold measurements of flow. The effectiveness of offset correction software will still need testing with respect to clinical flow acquisitions.

Item Type:Article
ISSN:1097-6647
Uncontrolled Keywords:Aorta; Artifacts; Blood Flow Velocity; Cardiac Output; Gelatin; Humans; Image Interpretation, Computer-Assisted; Magnetic Resonance Imaging, Cine; Materials Testing; Mitral Valve Insufficiency; Phantoms, Imaging; Predictive Value of Tests; Pulmonary Artery; Reproducibility of Results; Respiratory Mechanics
Group:Faculty of Health & Social Sciences
ID Code:36366
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:13 Dec 2021 13:17
Last Modified:13 Dec 2021 13:17

Downloads

Downloads per month over past year

More statistics for this item...
Repository Staff Only -