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| two items that are not associated |
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| Two items that are associated such that one item increases, the other increases |
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| Two itemss that are associated or affiliated |
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| Two items are associated such that when one item icreases, the other decreases |
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| A number followed by the word percent is unitlesss |
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| Mechanical & longitudinal |
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| The effects of the sound wae upon the biologic tissue through which it passes |
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acoustic propagation
properties |
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Definition
The effects of the medium upon the
sound wave |
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- Pressure
- Density
- Distance
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Concentration of force in an area
pascals(Pa)
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Concentration of mass in a volume
kg/cm³ |
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Measure of particle motion
cm,feet,mile |
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- Period
- Frequency
- Amplitude
- power
- Intensity
- Wavelength
- Propagation speed
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| Seven acoustic parameters |
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| Two waves that peaks occur at the same time and at the same location |
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| These waves lose theri individual characteristics at that moment and combine to form a single wave |
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Two waves that peaks occur at
different times |
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| Constructive Interference |
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| The interference of a pair of in-phase waves results in the formation of a single wave of greater amplitude than either of its components |
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| The interference of a pair of out-of-phase waves results in the formation of a single wave of lesser amplitude than either of its components |
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| Describe features of a sound wave |
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| Ultrasound system and transducer |
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| What is the source of a sound wave? |
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the time it takes a wave to vibrate a
single cycle |
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Time
Sec,ms,hours,or days |
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Definition
| Period is reported in what units? |
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| Period is determined by what? |
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| The number of particular events that occurs in a specific duration of time |
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| In clinical imaging, frequency ranges approximately what? |
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| Frequency is determined by what? |
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| Can the frequency be adjusted? |
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| It affects penetration and image quality |
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| Why is frequency important? |
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| How are frequency and period related? |
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Definition
| Period and frequency are also what? |
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- Amplitude
- Power
- Intensity
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Definition
| Three parameters describe the size, or magnitude, or strength of a sound wave |
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Definition
the "bigness" of a wave
It is the difference between the maximum value and the average or undisturbed value of an acoustic variable |
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| 1 million pascals to 3 million pascals |
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Definition
| In clinical imaging, pressure amplitude ranges what? |
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Definition
| Amplitude is determined by what? |
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| Can amplitude be adjusted? |
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The rate of energy transfer or the rate at which work is performed.
Also describes "bigness" of a wave |
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Definition
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| In clinical imaging, typical powers range from what? |
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| Powere is determined by what? |
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They are proportional, directly related
Power=amplitude² |
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Definition
| How are power and amplitude related? |
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The concentration of energy in a sound beam.
Also describes the "bigness" of a wave. |
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watts/square centimeter
W/cm² |
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Definition
| What is the units for intensity? |
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Definition
In clinical imaging, intensity ranges
from what? |
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| Intensity is determined by what? |
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intensity = power
(proportional) |
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Definition
| how is intensity and power related? |
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Definition
| The distance or length of one complete cycle |
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Meters
Any units of length |
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Definition
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| Both the source and medium |
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Definition
| What is wavelength determined by? |
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Definition
| can wavelength be adjusted? |
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Definition
| How are wavelength and frequency related? |
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Definition
| In soft tissue, frequency of 1 MHz has a wavelength of what? |
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Term
Wavelength =
1.54 (mm/microsecond)/Frequency (MHz) |
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Definition
| What is the rule that defines the relationship between frequency and wavelength of sound in soft tissue? |
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| Shorter wavelength sound produces higher quality images with greater detail. |
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Definition
| Why is wavelength important in diagnostic ultrasound? |
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Definition
| the distance that a sound wave travels through a medium in 1 second |
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| units of propagation speed? |
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Definition
| In the body, the speed of sound ranges from what? |
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Definition
| Speed is determined by what? |
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Definition
| is speed of sound adjustable? |
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Definition
| What is the speed of sound in soft tissue? |
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| What two characteristics of a medium affect the speed of sound? |
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| the ability of an object to resist compression |
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| Describes the relative weight of a material, weighs more |
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| how are stiffness and speed related? |
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| How are density and speed related? |
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