Studies have shown that left ventricular diastolic function is an important indicator of overall cardiac health [1,2]. Quantitation of diastolic function using non-invasive imaging techniques continues to be a long-standing goal for clinicians. The recent development of ultrasound Doppler color M-mode imaging techniques to measure the speed of flow propagation within the ventricle during diastole appears promising in this regard. However, significant subjectivity in measuring flow propagation speed exists. One reason for this is that the relationship between clinically derived parameters such as color M-mode flow propagation and underlying fluid mechanics of diastolic filling is still unclear.

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