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A dirty shadow in ultrasound imaging is a type of artifact characterized by an ill-defined, irregular anechoic or hypoechoic region posterior to a highly reflective or gas-filled structure. Unlike a clean shadow, which has sharp borders and indicates a solid object (e.g., bone or calculus), a dirty shadow often suggests the presence of gas or…

In medical ultrasound, a clean shadow is a type of artifact characterized by a sharp, anechoic (black) area behind a highly reflective or attenuating structure. This phenomenon occurs when sound waves are completely blocked by an object, preventing them from reaching deeper tissues. Common examples include shadows cast by gallstones, kidney stones, or calcifications, which…

The twinkle artifact in medical ultrasound is a common phenomenon appearing as a rapidly changing mosaic of colors behind highly reflective, rough surfaces like calcifications or kidney stones. This artifact, often misinterpreted as true blood flow, is crucial for sonographers to recognize as it can aid in the detection and characterization of certain lesions. Understanding…