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38 Cards in this Set

  • Front
  • Back
wavelength (l)
distance between one compression and one rarefraction
frequency (f)
Hertz, 1/s cycles per second determined by the sound source only
period (t)
seconds, time to complete one cycle
Acoustic Velocity
speed at which a wave travels through a medium
amount of amplitude reduction as the wave travels
average attenuation of US
3 components of sound waves
longitudinal, mechanical, need a source
Longitudinal waves
particles vibrate in the same direction as the wave
Transverse waves
particles vibrate perpendicular to the wave
pushes out
pulls in
propagation of sound
how the sound energy is transmitted to the area remote of the sound source
propagation of vibration
depends on the sound propagation media
Sound wave properties
pressure, power, intensity, amplitude
Specular Reflector
an interface larger than the width of the beam
all reflection in DMS depends on the acoustic impedance mismatch
Acoustic Impedance
how much a medium resists sound
Impedance mismatch
determines the amount of reflection that occurs
diffuse reflection
interface larger than the beam width
interface smaller than the beam width
Acoustic impedance mismatch, angle of incidence, SST
Snells Law
Angle of transmission determines the resulting angle of incidence
ultrasound beam to spread out as the waves move farther from the sound source
con. and dest. waves running into each other
a change in direction
4 acoustic variables
temperature, pressure, particle motion, density
4 media characteristics
elasticity, compressibility, density, bulk modulus
Frequency of sound in DMS
Air, Water, Soft Tissue, Muscle, Bone
330, 1480, 1540, 1580, 4080
The FORCE particles experience
Energy delivered to a specific area per unit time
Total energy of the beam summed over the entire cross-sectional area
Maximum variation that can occur between two acoustic variables
Med 1 is stronger than Med 2, so the beam bends TOWARDS normal incident
Case 1
Med 1 is slower than Med 2, so the beam bends AWAY from normal incident
Case 2
Med 1 is slower and the angle is less than 22 degrees and the beam shears away
Case 3
Mass per medium measures in volume
How much the media volume decreases when pressure is applied
How resistant the medium is to change
Bulk Modulus