Electrocardiography is a technique which uses ultrasonic waves to get the image of various parts of the heart.
True
Electrocardiography is a technique in which ultrasonic waves are made to reflect from various parts of the heart and an image of the heart is produced.
An ECG (electrocardiogram) records the electrical activity of your heart. It provides information about your heart rate and rhythm and shows if there is enlargement of the heart due to high blood pressure (hypertension) or evidence of a previous heart attack.