Ultrasound is one of the work horses in daily clinical practice and is frequently used to image the human body. Next to (non-invasive) imaging of anatomy, ultrasound functional imaging can be performed to assess flow, perfusion, motion, mechanical properties and morphology. Recent developments have given the field of ultrasound imaging an enormous boost, leading to the availability of e.g. ultrafast imaging, 3D echography, photo acoustics and high frequency ultrasound. In this course, we will discuss the basic physics of ultrasound and echography, ultrasound functional imaging techniques and their application in medical imaging and diagnostics.