Echo E-waves and the PDF method is desecribed in these papers, among others
Kinematic analysis of diastolic function using the freely available software Echo E-waves – feasibility and reproducibility. Sundqvist MG, Salman K, Tornvall P, Ugander M
BMC Medical Imaging. 2016;16:60.
Evaluation of diastolic function with Doppler echocardiography: the PDF formalism. Kovács SJ, Barzilai B, Pérez JE.
Am J Physiol. 1987;252:H178–87.
Chamber properties from transmitral flow: prediction of average and passive left ventricular diastolic stiffness. Lisauskas JB, Singh J, Bowman AW, Kovács SJ.
J Appl Physiol. 2001;91:154–62.
J Appl Physiol. 2001;91:154–62.
Kinematic Modeling Based Decomposition of Transmitral Flow (Doppler E-Wave) Deceleration Time into Stiffness and Relaxation Components. Mossahebi S, Kovács SJ. Cardiovasc Eng Technol. 2014;5:25–34.
Load-independent index of diastolic filling: model-based derivation with in vivo validation in control and diastolic dysfunction subjects. Shmuylovich L, Kovács SJ. J Appl Physiol. 2006;101:92–101.
The Kinematic Filling Efficiency Index of the Left Ventricle: Contrasting Normal vs. Diabetic Physiology. Zhang W, Chung CS, Riordan MM, Wu Y, Shmuylovich L, Kovacs SJ. Ultrasound Med Biol. 2007;33:842–50.
A full list of PDF-related work can be found at Kóvacs group’s Cardiovascular Biophysics Laboratory homepage.