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Reverberation artefacts are common issues in ultrasound imaging that can obscure or distort the true structure of tissues. Understanding their causes and implementing mitigation techniques can improve image clarity and diagnostic accuracy.
What Are Reverberation Artefacts?
Reverberation artefacts occur when ultrasound waves bounce multiple times between two strong reflectors, creating false echoes. These echoes appear as repetitive lines or bands that do not correspond to actual tissue structures.
Causes of Reverberation Artefacts
The primary causes include highly reflective surfaces such as gas bubbles, calcifications, or metal objects. The angle of the ultrasound probe and the frequency used can also influence the likelihood of artefact formation.
Techniques to Reduce Reverberation Artefacts
Several strategies can help mitigate reverberation artefacts during ultrasound examinations:
- Adjust the probe angle: Changing the angle can reduce reflections between surfaces.
- Use different imaging settings: Lowering the gain or changing the frequency may decrease artefact visibility.
- Apply tissue harmonic imaging: This technique enhances image quality and reduces artefacts.
- Introduce acoustic shadowing: Using shadowing can help differentiate true structures from artefacts.
- Change the probe position: Moving the probe can alter the reflection pathways and minimize artefacts.