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what is the log of 1000
3
What is the attenuation coefficient formula?
Attenuation Coefficient (dB) x distance (cm)= total attenuation (dB)
Attenuation weakens...
Intensity, Power, Amplitude
What are the synonyms?
Penetration Depth, Depth of Penetration, Half Boundary Layer
Meaning of impedance
The acoustic RESISTANCE to the sound beam traveling in the medium
2 forms of reflection
Specular and Diffuse
What is the attenuation coefficient formula is soft tissue?
Attenuation Coefficient = (frequency (MHz))/2
What does sound do as it travels through the body?
It weakens
What are the units?
cm
What are the units of impedance?
Rayls
More attention= __________ distance and ________ frequencies.
longer, higher
What is the Impedance formula?
Impedance (rayls) = density (kg/cm3) x propagation speed(m/s)
Attenuation is determined by
Path Length and Frequency of Sound
What are the 2 factors that the half-value layer thickness depends on?
The medium, the frequency of sound
What is impedance determined by?
Medium only
What has the highest amount of attenuation?
Air
What is the log of 1,000?
Log of 3
Attenuation is measured in
dB
How do you describe thin half value thickness?
Higher frequencies and Tissues w/ high attenuation rates
What is the formula for impedance?
Impedance (rayls) = density (kg/cm3) x propagation speed(m/s)
The distance sound travels in a tissue that reduces the intensity of sound to one-half its original value is
Half-Value Layer Thickness
What is the log of 2,000,000?
Log of 6
What are the 3 process that contribute to attenuation?
Reflection, Scattering, Absorption
How do you describe thick half-value thickness?
Lower frequencies and Tissues w/ low attenuation rates
What letter represents impedance?
Z