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Terms in this set (61)
Definition of Acoustic propagation properties
the effects of the medium upon the sound wave
what is Sound ?
A type of wave that carries energy , not matter, from place to place.
sound is created by ________objects
are areas of increased pressure and density
are areas of decreased pressure and density
Sound must travel ________
through a medium
Sound is a _____ and ______wave.
mechanical and longitudinal wave.
sound travels in a ______line.
Acoustic Variable identify?
which waves are sound waves
what are the 3 Acoustic Variables?
pressure is the concentration of _________
force within an area, Force/Area
Density is the concentration of ________
mass within a voulume.
Distance measures _______
of particle motion.
Units: (distance, mm or cm)
particles move in a perpendicular direction, what type of wave is this?
particles move back and fourth i the same direction as the wave; what type of wave is this?
Acoustic parameters describe what?
the features of a particular sound wave
Definition of Period.
the time required to complete a single cycle
period is determined by ?
Sound source only, cant be changed by sonographer
what is the definition of Frequency?
Number of certain events that occur in a particular time duration
Frequency is determined by
sound source, Cant be changed by Sonographer
what are frequencys units ?
per second, hertz,hz
Frequency typical value is
what is Audible range
btwn 20 Hz and 20,000 Hz (can hear)
what is Ultrasound range
greater than 20,000 Hz
what is infrasound range
less that 20 Hz
what is the relationship between period and frequency?
reciprocals and has an inverse relationship.
when period decreases what does frequency do?
When period increases, frequency
What are the 3 bigness parameters?
amplitude, power, intensity
the 3 bigness parameters are determined by _____
can the 3 bigness paramters be changed by the Sonographer?
what is the definition of Amplitude
the difference btwn the average value and the maximum value of an acoustic variable.
bigness may be expressed in
the definition of Power
the rate at which work is performed, or the rate of energy transfer
what is the relationship btwn power and amplitude?
power is proportional to the waves Amplitude Squared
Definition of Intensity
the concentration of energy in a sound beam
I = P/A
I=power(watts) / Area (cm2)
Intensity is proportional, or directly related to the
intensity is ______to the amplitude squared
Definition of wavelength
The length or distance of a single cycle
Wavelength is determined by
Both the source and the medium
Wavelength in soft tissue
1.54mm/us divided by frequency(MHz)
definition of propagation speed
The rate that sound travels through a medium, also called velocity or speed
propagation speed is determined by
speed and wavelength are _______.
sound in a slow medium has a _____ wavelength
sound in a fast medium has a _____ wavelength
what is the average speed of all sound in biologic or " soft tissue"
1.54m/s = 1.54km/s = 1.54mm/us
Lung(air) <fat<Soft tissue<bone
GAS (slower)< Liquid< Solid(FASter)
Stiffness and Speed are in what direction?
Density and Speed are in what direction?
Compressibility and Elasticity are _______of stiffness.
Bulk modules is the same as Stiffness. So , when Bulk modules increase Speed ______.
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