This machine is a Philips iU22 Ultrasound machine used for imaging studies in healthy volunteers and study-patients. The machine is used in a variety of ultrasound applications including muscular skeletal, viseral, vascular and contrast enhanched ultrasound imaging. Two probes are available for use with this machine (vascular and abdomanal probes). The machine takes images and video which can be stored on a PC with a finite memory. The machine is also equipped with a colour doppler. The machine is locally portable in that it icludes a trolley.