Effects of heart valve prostheses on phase contrast flow measurements in Cardiovascular Magnetic Resonance – a phantom study

Journal of Cardiovascular Magnetic Resonance

Research

Carsten Schwenke¹  Andreas Greiser²  Matthias A. Dieringer²  Johanna Richau³  Julius Traber⁴  Jeanette Schulz-Menger⁴  Florian von Knobelsdorff-Brenkenhoff⁵ 

[1] SCO:SSiS, Berlin, Germany;Siemens Healthcare GmbH, Erlangen, Germany;Working Group on Cardiovascular Magnetic Resonance Imaging, Experimental and Clinical Research Center, joint cooperation of the Max-Delbrück-Centrum and Charité -Medical University Berlin, Berlin, Germany;Working Group on Cardiovascular Magnetic Resonance Imaging, Experimental and Clinical Research Center, joint cooperation of the Max-Delbrück-Centrum and Charité -Medical University Berlin, Berlin, Germany;HELIOS Klinikum Berlin-Buch, Department of Cardiology and Nephrology, Berlin, Germany;Working Group on Cardiovascular Magnetic Resonance Imaging, Experimental and Clinical Research Center, joint cooperation of the Max-Delbrück-Centrum and Charité -Medical University Berlin, Berlin, Germany;HELIOS Klinikum Berlin-Buch, Department of Cardiology and Nephrology, Berlin, Germany;Department of Cardiology, Clinic Agatharied, Ludwig-Maximilians-University Munich, Hausham, Germany;

关键词: Cardiovascular magnetic resonance;    Phase contrast;    Flow phantom;    Valve prosthesis;    Artefacts;   

DOI  :  10.1186/s12968-016-0319-1

 received in 2016-12-03, accepted in 2016-12-21,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundCardiovascular Magnetic Resonance is often used to evaluate patients after heart valve replacement. This study systematically analyses the influence of heart valve prostheses on phase contrast measurements in a phantom trial.MethodsTwo biological and one mechanical aortic valve prostheses were integrated in a flow phantom. B0 maps and phase contrast measurements were acquired at a 1.5 T MR scanner using conventional gradient-echo sequences in predefined distances to the prostheses. Results were compared to measurements with a synthetic metal-free aortic valve.ResultsThe flow results at the level of the prosthesis differed significantly from the reference flow acquired before the level of the prosthesis. The maximum flow miscalculation was 154 ml/s for one of the biological prostheses and 140 ml/s for the mechanical prosthesis. Measurements with the synthetic aortic valve did not show significant deviations. Flow values measured approximately 20 mm distal to the level of the prosthesis agreed with the reference flow for all tested all prostheses.ConclusionsThe tested heart valve prostheses lead to a significant deviation of the measured flow rates compared to a reference. A distance of 20 mm was effective in our setting to avoid this influence.

【 授权许可】

CC BY   
© The Author(s). 2017