Both ultrasound for medical imaging and seismology for imaging the Earth's interior measure the propagation of waves through matter. For example, when seismic waves encounter material differences in ...

What Is a Liver Ultrasound? A liver ultrasound is a type of abdominal ultrasound, an imaging test that uses high-frequency sound waves to create pictures of the organs and structures in your abdomen, ...

Ultrasound works by sending sound waves through the body. Doctors can recommend ultrasound therapy to treat pain. It may work best alongside other treatments. Many people know ultrasound as an imaging ...

This is a sound head created by John J. Wild in 1949. It is a brass capsule constructed by Wild to house a piezoelectric quartz crystal, or transducer. The crystal is still within the sound head. Wild ...