Term
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Definition
| Longitudinal and Mechanical waves |
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Term
| Wavelength is a measure of |
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Definition
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Term
Which is not an acoustic variable?
a. Density
b. Distance
c. Intensity
d. Pressure |
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Definition
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Term
| Lower frequency waves create higher image quality and better details. |
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Definition
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Term
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Definition
the # of cycles per second
the reciprocal of period
inversely related to period |
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Term
| Waves transfer ___ from one location to another. |
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Definition
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Term
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Definition
| The time for one complete cycle to occur. |
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Term
| The maximum cyclical change in a quantity is known as |
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Definition
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Term
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Definition
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Term
| Two waves arrive at a location at the same time. What event takes place? |
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Definition
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Term
| When you change the fundamental frequency, what changes? |
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Definition
| The # of cycles per second |
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Term
| Frequency of a sound waves is determined by |
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Definition
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Term
| As the frequency of an acoustic variable increases, the wavelength__ |
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Definition
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Term
| Terms that can be used to describe the strength of a sound beam are__ |
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Definition
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Term
| As the sound wave travels through soft tissue, what happens to the frequency? |
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Definition
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Term
| Amplitude is measured in__ |
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Definition
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Term
| The units label used for power is |
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Definition
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Term
| Intensity and power are related to amplitude by |
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Definition
| Proportional to amplitude squared |
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Term
| If the power of a wave is halved, the intensity is reduced to 1/4 its value. |
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Definition
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Term
| The formula for intensity is |
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Definition
Intensity =
Power (watts) ÷ Area (cm2) |
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Term
| Wavelength is equal to propagation speed__ |
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Definition
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Term
| Intensity can be changed by the sonographer. |
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Definition
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Term
| Intensity of ultrasound is measured in__ |
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Definition
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Term
| As the wave propagates through the tissue, the amplitude__ |
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Definition
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Term
| Wavelength is determined by |
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Definition
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Term
| Wavelength = propagation speed ÷ by__ |
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Definition
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Term
| Image quality is affected by wavelength? |
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Definition
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Term
| If frequency increases, wavelength__ |
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Definition
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Term
| Shorter wavelengths create higher quality images with better detail. |
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Definition
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Term
| The # of wavelengths passing a given point in a single second is called__ |
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Definition
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Term
| Propagation speed = ____ × wavelength. |
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Definition
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Term
| Propagation speed does not change as frequency increases. |
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Definition
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Term
| If both propagation speed and frequency double, the wavelength will |
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Definition
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Term
| If stiffness increases, propagation speed__ |
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Definition
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Term
| U/S travels slowest through__ |
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Definition
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Term
| Stiffness of a medium is the opposite of compressibility/elasticity |
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Definition
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Term
| What term is the reciprocal of Mega? |
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Definition
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Term
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Definition
| when one item increases or decreases, the second item responds to the same direction |
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Term
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Definition
| Items are related so that the change in one creates an opposite change in the other |
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Term
| What is not a measurement of area? |
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Definition
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Term
| What is the reciprocal of 5? |
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Definition
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Term
| When the elasticity of a medium is high, the___ is high. |
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Definition
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Term
| What creates the fastest speed of sound? |
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Definition
| Low density, high stiffness |
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Term
| The propagation speed used for soft tissue is __ |
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Definition
| An average based on the usual %'s of each type of tissue |
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Term
| The term bulk modulus is related to which quality? |
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Definition
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Term
| The ultrasound wave travels faster than the audible wave. |
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Definition
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Term
| What can cause increased propagation speed? |
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Definition
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Term
| The propagation speed of continuous wave ultrasound is faster than pulsed wave ultrasound. |
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Definition
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Term
| Place (liquid, gas, solid) in order of slowest to fastest propagation speed. |
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Definition
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Term
| Two quantities are directly proportional if an increase in one quality leads to a/an___ in the other. |
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Definition
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Term
| A reciprocal relationship means |
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Definition
The items are inversely related.
When the reciprocals are multiplied, result is 1.
When 1 item increases or decreases, other item does the opposite. |
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Term
| A measurement of 40mm can also be expressed as __ |
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Definition
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Term
| If the direction of particle motion in a wave is perpendicular to the direction of propagation of the wave, the wave is__ |
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Definition
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Term
| The frequency that is closests to the lower limit of ultrasound is __ |
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Definition
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Term
| The unit measurement for wave frequency is a measurement of __ |
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Definition
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Term
| The frequency of a transducer is 25,000,000 cycles per second. Can be written as__ |
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Definition
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Term
| What units are used to report the pressure of a sound beam? |
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Definition
Pounds/sq in
Pascals (Pa) |
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Term
| Wavelength depends on which two factors? |
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Definition
| Frequency and propagation speed |
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Term
| Constructive interference has the effect of __ the amplitude of a wave. |
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Definition
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Term
| The interaction of echoes that causes reinforcement rather than cancellation is known as__ |
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Definition
| Constructive interference |
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Term
| If the frequency of an U/S wave is doubled, what happens to the period. |
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Definition
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Term
| If frequency is 1MHz, what is the period? |
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Definition
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Term
| If the power of a wave is halved, the intensity is __. |
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Definition
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Term
The following are acoustic parameters except
a. pressure
b. period
c. propagation speed
d. frequency |
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Definition
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Term
| As sound propagations through soft tissue, the amplitude__ |
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Definition
| Decreases proportional to distance |
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Term
| If the power is doubled, but the intensity remained the same, what happened to the beam area? |
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Definition
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Term
| If the power is doubled, but the intensity remained the same, what happened to the beam area? |
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Definition
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Term
| If the power in a beam is 1 watt and the area is 5cm2, the beam's intensity is __ |
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Definition
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Term
| If the amplitude of a wave is increased by a factor of 3, the power |
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Definition
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Term
| If the amplitude is doubled, the intensity is |
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Definition
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Term
| If beam area is reduced by half and the power stays the same, intensity__ |
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Definition
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Term
| The normal range of intensities used in Doppler ultrasound is __ |
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Definition
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Term
| What determines the initial amplitude of a sound beam? |
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Definition
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Term
| Which parameter of sound is determined ONLY by the medium? |
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Definition
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