The Echostatic pattern is the typical shape the A-Scan takes when a beam is targeted at a certain type of indication. Each indication has its own pattern, but these patterns can be classified in three main categories:
- Single and smooth. Can be a signal from a SDH or a lack of fusion
- Single and jagged. Can be a signal from a multi-facet crack
- Multiple. Can be a signal from porosity
The Echostatic pattern of an indication can change depending on the position of the probe in regards to the indication. Hence a second type of pattern called the echodynamic pattern can be very useful to identify the type of indication.