UH US 2010
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20 terms
Terms | Definitions |
|---|---|
 Ultrasound | Sound that has a higher frequency than our normal hearing (>20KHz) |
| Frequency | The number of wave cycles passing a point every second |
| Transverse wave | A wave in which the vibration is at right angles to the direction in which the wave is traveling. |
| Longitudinal wave | A wave in which the vibration is in the same direction as that in which the wave is traveling |
| Compression | Region where molecules of medium are squeezed together |
| Rarefaction | Region where molecules of medium are drawn apart |
| Interference | Overlapping of one or more waves onto another wave to produce one combined wave |
| Constructive interference | Two waves combine to make a wave with a larger amplitude |
| Destructive interference | Two waves combine to make a wave with a smaller amplitude |
| In phase | When the crest of a wave overlaps with crest of another wave as do the troughs |
| Out of phase | When the crest of a wave overlaps the trough of another wave |
| Period | The amount of time it takes one wavelength/cycle to pass a point |
| Wavelength | Distance/length of a single cycle |
| Refraction | Bending of beam's path at the interface between different media |
| Attenuation | Decrease in US intensity as the wave moves through the tissues due to absorption, reflection and refraction |
| Reflection | Redirection of the beam away from the interface surface at an opposite angle. |
| Transducer | An instrument that converts electrical energy into mechanical energy |
| Doppler Effect | Phenomenon of a frequency shift observed when there is a moving source or a moving observer |
| Lens | Convex transparent cover on transducer that causes beam to converge |
| Acoustic impedance | Measure of a material's response to the propagation of a sound wave of given pressure |
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