Development of a noninvasive ultrasound color M-mode means of estimating pulmonary vascular resistance in pediatric pulmonary hypertension: mathematical analysis, in vitro validation, and preliminary clinical studies.
Shandas R, Weinberg C, Ivy DD, Nicol E, DeGroff CG, Hertzberg J, Valdes-Cruz L. Development of a noninvasive ultrasound color M-mode means of estimating pulmonary vascular resistance in pediatric pulmonary hypertension: mathematical analysis, in vitro validation, and preliminary clinical studies. Circulation. 2001 Aug 21; 104(8):908-13.