What is echogenicity?

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Echogenicity is the brightness of tissue on grayscale ultrasound, reflecting how strongly a structure returns echoes. It’s a relative measure: we compare how bright one structure looks to another, based on the amplitude of the reflected signal. The concept is essential when describing things like fatty liver (more echogenic, brighter) versus normal liver, or when distinguishing different tissues by how much ultrasound they reflect.

This idea is distinct from measuring how fast blood is moving (that’s Doppler velocity) or from color Doppler, which represents flow rather than tissue brightness. It’s also not about the size of the liver. So the best description is that echogenicity is a term used to compare signal amplitudes between structures.