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Definition
| Echogenic: Ability to reflect or transmit US waves in the context of surrounding tissues Whenever there is an interface of structures with different echogenicities, a visible difference in contrast will be apparent on the screen. Based on echogenicity, a structure can be characterized as hyperechoic (white on the screen), hypoechoic (gray on the screen) and anechoic (black on the screen) |
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Term
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Definition
Isoechoic: Producing ultrasound echoes equal to those of neighboring or of normal tissues
Whenever there is an interface of structures with different echogenicities, a visible difference in contrast will be apparent on the screen.
Based on echogenicity, a structure can be characterized as hyperechoic (white on the screen), hypoechoic (gray on the screen) and anechoic (black on the screen) |
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Term
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Definition
Hyperechoic: Produces bright shades of gray to white
Renal sinus is hyperechoic as compared to renal parenchyma |
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Term
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Definition
Anechoic: (without echo) no significant echos are generated.
Bone appears black (anechoic) on US, with a bright hyperechoic rim. Because the US beam cannot penetrate bone, it casts an acoustic shadow beyond it
Fluid such as in blood vessels also appear black (anechoic)
Fat is almost anechoic |
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Definition
Hypoechoic: Produces images that appear moderate gray on the screen
Cartilage appears hypoechoic because it is more penetrable by US than bone |
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