Echogenic nálar

In contrast, the echo needle has a pattern engraved on the needle shaft to maximize the reflection of ultrasonic waves back to the probe. Two types of echo etching are generally used. The first type is a dihedral groove etched into the needle surface. If the incident wave is a plane wave aligned with the needle axis, this type of etching works well. In most cases, the groove will be continuously etched around the needle shaft, similar to the thread on a screw. In this way, the dihedral corner reflector actually becomes a general three-dimensional surface reflector. The depth and period of the groove can be optimized for the reflection of sound waves of different frequencies. Another type of reflector is the tetrahedral reflector, which has a four-sided intermittent etch on the axis of the needle. In this case, the tetrahedral etching is a general three-dimensional reflector, and the needle has a triangular pattern etched on its surface.

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