Ultrasound machines are usually large, stationary pieces of equipment but the demand for portable ultrasound units is increasing. While therapists on the go can transport small ultrasound machines in shoulder bags, moving them around a medical facility is much easier and more accessible on a medical cart. Any rolling utility cart can be an ultrasound cart given that it can hold its weight, but if you want to make the most out of it, tape an extension cord to the cart or look for a therapy cart from the same manufacturer as the ultrasound machine.