What does US stand for in medical imaging?

In the context of medical imaging, "US" stands for Ultrasound. Ultrasound is a widely used imaging technique that utilizes high-frequency sound waves to create images of structures within the body. It is non-invasive, does not involve radiation, and is often used to visualize organs, monitor pregnancies, and guide certain medical procedures.

The term "Ultrasound" accurately describes the principle behind the imaging method: sound waves that are above the frequency range of human hearing (ultrasound) are emitted and then captured after bouncing off tissues and organs, producing images that are interpreted by medical professionals. This makes it a vital tool in both diagnostic and therapeutic contexts, known for its safety and effectiveness.