Key result
Cardiac cine MRI assesses LV volume and wall motion but struggles to quantify valvular regurgitation.
Why the study?
Can cardiac cine MRI accurately evaluate cardiac motion, function, and valvular regurgitation flow?
Observational
Can cardiac cine MRI accurately evaluate cardiac motion, function, and valvular regurgitation flow?
Cardiac cine MRI is a reliable method for evaluating left ventricular volume and wall motion, but flow void size alone is insufficient for quantifying valvular regurgitation.
Cine MRI supports routine LV volumetry and wall motion assessment; leaves open quantitative regurgitation evaluation by flow void size alone.
Cardiac cine magnetic resonance imaging (MRI) was studied to evaluated the cardiac motion and function, and a water-stream phantom study was performed to clarify whether it was possible to quantitatively assess the valvular regurgitation flow by the size of the flow void. In normal subjects, the left ventricular (LV) epicardial apex swung up to the base only a few millimeters, and the mitral annulus ring moved about 14 mm as mean value toward the apex during systole. Those motions of mitral annulus ring may contribute to the left atrial filling. The LV longitudinal shortening and torsions were shown by the tagging method. This tagging method was the best method for estimating cardiac motions. Cardiac cine MRI using software including a modified Simpson's method program and a wall motion analysis program was useful for routine LV volumetry and wall motion analysis because it was a simple and reliable method. Our water-stream phantom studies demonstrated that it might be difficult to perform quantitative evaluation of valvular regurgitation flow by using only the size of the flow void without acquiring information relating to the orifice area.
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Kondo et al. (1992) conducted an observational in Normal subjects. Cardiac cine magnetic resonance imaging (MRI) was evaluated on Cardiac motion, function, and valvular regurgitation flow. Cardiac cine MRI was useful for routine left ventricular volumetry and wall motion analysis, but quantitative evaluation of valvular regurgitation flow by flow void size alone was difficult.