Preface

Author	I.A.C. van der Bilt
Moderator	J.S.S.G. de Jong
Supervisor
some notes about authorship

This open access online course and textbook for echocardiography is made by cardionetworks foundation. This website is intended for Echotechnicians, Cardiology residents, and as a reference for Cardiologists. All images and movies are licensed under the creative commons license.

Echocardiography uses the principle of sound to visualize the heart.