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Ultrasound imaging uses sound waves to create images of structures within the body. This method involves emitting high-frequency sound waves that travel through the body and are reflected back to a transducer that captures the echoes. The differences in the echo patterns, based on various tissue densities and interfaces, allow for the creation of detailed images of organs, tissues, and even blood flow in real-time.

This technique is particularly advantageous in a medical setting due to its safety, as it does not involve any radiation or harmful effects associated with other imaging methods. It is a non-invasive procedure commonly used in various applications, such as prenatal scanning, evaluating organ health, and guiding certain medical procedures.

The other methods mentioned in the options, such as radiation, magnetic fields, and X-rays, are associated with different imaging technologies, such as CT scans, MRI, and traditional X-ray imaging, which do not utilize sound waves for image production.