Séance Séminaire

Séminaire des Doctorant·e·s

Intracardiac hemodynamics: a parametric study

A numerical framework to compute the blood flow within patient-specific human hearts was developed by Chnafa et al. The geometry of the heart cavities and their wall dynamics were extracted from medical images, and the simulations were made using the in-house YALES2BIO solver in order to obtain a well-resolved description of the turbulent fluctuations within the intra-cardiac flow. With some improvements, this model will be used in order to validate a methodology named 4D-iVFM for data reconstruction from color Doppler imaging. Namely, 4D-iVFM extends the single component velocity field measured by echocardiography into a 3-components field. The aim of this still on-going research effort is to develop an efficient and accurate tool which can be easily used by cardiologists to determine if a flow is abnormal or not, and prevent certain heart diseases. In this context, variations of the heart models developped by Chnafa at al. are generated by varying some key features of the flow in order to better understand their influence on the cardiac hemodynamics and challenge the 4D-iVFM algorithm in a variety of situations. To have these different blood flows, modifications of the frequency of the heartbeat, the diastole-systole ratio, the volume of the heart, the shape of the mitral valve and the add of chordae tendineae will be performed. The blood flow modifications generated by these changes will be presented during this talk.