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echo patterns that can be displayed and recorded by portable instruments. A trained

operator identifies specific echo patterns corresponding to the echo response from
good parts and from representative flaws. The echo pattern from a test piece may

then be compared to the patterns from these calibration standards to determine its
condition.

Echocardiography:

In the process of electrocardiography, the ultrasonic waves are used to form an

image of the heart using reflection and detection of these waves from various parts.

Ultrasonography:

Medical ultrasound is a diagnostic imaging technique based on it. It is used for the

imaging of internal body structures such as muscles, joints and internal organs.