Ultrasound (USG) is a non-invasive imaging technique that uses high-frequency sound waves to visualize internal structures of the body. Understanding the basics of ultrasound begins with physics, which explains how sound waves travel through tissues and reflect back to create images. Machine knobology is key to mastering ultrasound, as it involves learning how to adjust settings like gain, depth, and frequency to optimize image quality. Needling refers to the practice of using ultrasound to guide needles during procedures, ensuring accuracy and safety. Tissue echotexture is another essential concept, as it helps identify different structures based on how they appear on the ultrasound—hypoechoic (dark) for fluid-filled areas, hyperechoic (bright) for dense tissues, and isoechoic for tissues with similar density. Artifacts, such as shadowing or enhancement, can sometimes appear and need to be recognized to avoid misinterpretation. Additionally, ultrasound is useful for detecting various pathologies, such as tears, cysts, or inflammation, by analyzing abnormal changes in the tissues’ appearance.
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