A cardiovascular technologist, sometimes referred to as a technician, acts as the eyes and ears of a doctor. Cardiovascular technologists use high frequency sound waves, also known as ultrasound, to create diagnostic images of the heart, veins, and arteries. Ultrasound signals are sent into the body, reflected back, and processed to create a moving, 2-dimensional video clip of the anatomy. You can even see blood flowing through the heart, veins, and arteries with color flow D