Diagnostic Ultrasound: chpt 2

17 terms by CarrieMines 

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Sound, pulsed ultrasound,attenuation, echoes

What type of propagation is that in which speed depends on pressure and the wave shape changes?

nonlinear propagation

What type of waveform is characterized by a single frequency?

sinusoidal waveform

What is the term for the original frequency?

fundamental frequency

What is described as the even and odd multiples of the fundamental frequency?

harmonics

What is the range of frequencies contained in a pulse?

bandwidth

The bandwidth divided by the operating frequency is what? (it is unitless)

fractional bandwidth

What is the greatest intensity found across the beam? (usually in the center)

spatial peak

What is the average for all values found across the beam?

spatial average

What is the greatest intensity found in the pulse as it passes by?

temporal peak

What is the average for all values found in a pulse? (the lowest value since it includes the "dead" time between pulses)`

pulse average

What is the attenuation that occurs with each cm the sound wave travels? (units are Db/cm)

attenuation coefficient

This is a direction of travel of the ultrasound wave perpendicular to the boundary between two media.

perpendicular incidence

What determines how much of an incident sound wave is reflected back through the first medium and how much is transmitted into the second medium? (units are rayls)

acoustic impendence

If you divide the reflected intensity by the incident intensity you will calculate what?

intensity reflection coefficient

If you divide the transmitted intensity by the incident intensity you will calculate what?

intensity transmission coefficient

What is the direction of travel of incident ultrasound that is not perpendicular to the boundary between two medias? (the reflected sound does not return to the transducer but travels off in some other direction

oblique incidence

What is a change in direction of sound when crossing a boundary?

refraction

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