Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) DENNING K.,Determination of prestenotic flow volume using an automated method based on colour Doppler imaging for evaluating orifice area by the continuity equation: Validation in a pulsatile flow model.,Heart,,,1998,79,,324-330,https://cir.nii.ac.jp/crid/1570291224619313408,