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In ultrasound imaging, air appears as a distinct, hyperechoic (bright) area due to its low density and high acoustic impedance compared to surrounding tissues. This results in strong reflection of the ultrasound waves, creating a shadowing effect behind the air-filled structures. Consequently, ultrasound cannot penetrate air effectively, making it challenging to visualize deeper structures beyond air-filled spaces, such as the lungs or gastrointestinal tract.

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1w ago

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