Developed
as a spin-off from naval sonar devices, ultrasound uses very high-pitched
sound waves to look inside the body. A transducer is placed against
the skin, and a beam of sound waves passes into the body. Normally a
gel is applied to the skin to ensure good contact, as ultrasound will
not travel through air. The transducer also receives the signals which
echo back from boundaries between soft tissues and fluids, and converts
them into an electronic signal which is displayed on a computer screen.
The main use of ultrasound is in medicine, especially paediatrics, where
it is invaluable in checking the health of unborn children.
See more techniques:
Aerial Photography
Computed Tomography (CT Scans)
Endoscopy
High Speed Photography
Kirlian Photography
Light Microscopy (LM)
Magnetic Resonance Imaging (MRI)
Molecular Models
Radionuclide Scanning (Gamma Scanning)
Satellite Images
Scanning Electron Microscopy (SEM)
Scanning Tunnelling Microscopy (STM)
Schlieren Photography
Space Photography (NASA)
Thermography
Transmission Electron Microscopy (TEM)
Ultrasound Images
Ultraviolet Photography
X-Rays
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