Abstract
Background Assessing aortic valve stenosis (AVS) by cardiac magnetic resonance (CMR) remains challenging, largely due to effects of accelerated flow and resulting pressure recovery, or the phenomena of kinetic energy transmuting to static fluid pressure distally. Effective orifice area (EOA) is a technique used in echocardiography and has been shown to improve AVS assessment. The potential of phasecontrast velocity mapping (PC-MRI) to improve the accuracy of EOA rests on the ability to resolve high peak velocities; previous studies have shown systematic underestimation compared to echocardiography. We used in vitro experiments to assess the accuracy of EOA using the continuity equation with PC-MRI derived peak velocities and flows.
Highlights
Assessing aortic valve stenosis (AVS) by cardiac magnetic resonance (CMR) remains challenging, largely due to effects of accelerated flow and resulting pressure recovery, or the phenomena of kinetic energy transmuting to static fluid pressure distally
The potential of phasecontrast velocity mapping (PC-MRI) to improve the accuracy of Effective orifice area (EOA) rests on the ability to resolve high peak velocities; previous studies have shown systematic underestimation compared to echocardiography
We used in vitro experiments to assess the accuracy of EOA using the continuity equation with PC-MRI derived peak velocities and flows
Summary
Assessing aortic valve stenosis (AVS) by cardiac magnetic resonance (CMR) remains challenging, largely due to effects of accelerated flow and resulting pressure recovery, or the phenomena of kinetic energy transmuting to static fluid pressure distally. Effective orifice area (EOA) is a technique used in echocardiography and has been shown to improve AVS assessment. The potential of phasecontrast velocity mapping (PC-MRI) to improve the accuracy of EOA rests on the ability to resolve high peak velocities; previous studies have shown systematic underestimation compared to echocardiography. We used in vitro experiments to assess the accuracy of EOA using the continuity equation with PC-MRI derived peak velocities and flows
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