Artefacts
Reverberance
The reverberation artifact happens as a result of repetitive reflection back and forth between two highly reflective surfaces. When the ultrasound beam reflects back and forth between the reflectors (“reverberates”), the ultrasound transducer interprets the sound waves returning as deeper structures since it took longer for the wave to return to the transducer.
Study the first image to recognize the different layers. If you are sure about the layers, swipe to the second image to view the answer (if applicable).