Fig. 2From: Diagnostic point-of-care ultrasound (POCUS) for gastrointestinal pathology: state of the art from basics to advancedDenser materials reflect more ultrasound waves. As a result, fluid (like ascites) is black (anechoic), soft tissue (like the liver) is grey, fibrous tissue (like the diaphragm) is white without a shadow, and stones are white (hyperechoic) with a shadow. The air is very hyperechoic having reverberation artefactsBack to article page