Echocardiology is the interpretation of ultrasounds in order to perform imaging of the heart. Ultrasound techniques create 2-D slices of the heart and color Doppler is used to image blood flow.
Vascular studies are non-invasive procedures performed to assess blood flow in arteries and veins. These tests use Doppler ultrasound to determine vascular conditions throughout the body. No radiation is used, and the skin is not pierced.
Event monitors are similar to Holter monitors in that they monitor heart activity. Unlike Holter monitors, however, event monitors only record during symptoms. When experiencing symptoms, the event monitor must be started manually to record heart activity.