ELECTROCARDIOGRAPHY (ECG)-. The electrocardiography is better known as an ECG. This technique is used to record PROCESSING OF SIGNALS IN AN MRI:. It is this relationship between field-strength and frequency ULTRASOUND SCANS:. An ultrasound scan is a painless test that uses sound waves to create images of organs and structures OTHER BIOMEDICAL SIGNAL PROCESSING AREAS:. Gene detectors: these are the microprocessor chips