<unk>  is an indirect method of determining the<unk>  of the<unk><unk> <unk><unk> <unk> . The calculated<unk><unk>  orifice<unk>  is currently one of the measures for evaluating the severity of<unk>  stenosis. A<unk> <unk>  of less than 1.0 cm2 is considered to be severe<unk>  stenosis. There are many ways to calculate the<unk> <unk>  of<unk>  stenosis. The most commonly used methods involve measurements taken during echocardiography. For interpretation of these<unk> s, the<unk>  is generally divided by the body surface<unk> , to arrive at the patient's optimal<unk><unk>  orifice<unk> .
Aortic valve area calculation
Pressure–volume loop analysis in cardiology
Numerical modeling in echocardiography
Cardiac magnetic resonance imaging perfusion
Coronary CT calcium scan
Coronary flow reserve
Imaging Lung Sound Behavior with Vibration Response Imaging
Comparison of international blood pressure guidelines