Card Set Information
name 4 acoustic variables
what is nyquist criteria
what is propigation velocity in soft tissue
how many mu sec does it take sound to travel 1cm
6.5 mu sec
how long does it take to image to a depth of 1cm
6.5 mu sec x 2cm (travel time)=
what is density represented by?
what is density equasion
What are the 4 wave parameters
what is frequency/ period determined by and what are its units
cycles/second or HZ
what is wavelength determined by
wave source and medium
any form of distance mm
what is propagation velocity determined by and what are its units
what is amplitued determined by and what is its units
wave source but decreases with distance
volts or Decibels dB
what is the equasion for wavelength
size, strength, or volume
what is amplitued equasion
what is range of infrasound
What is range of Ultrasound
What is range of audible sound
What is formula for bulk modulus?
change in pressure
change in volume
High bulk modulus material is
low bulk modulus material is
what is equasion for prop v as related to Bulk modulus
c=square root of
what is prop v in air
What is prop v in bone?
what is prop v in soft tissue?
what is prop v range for gases
ie... air, helium, hydrogen
what is prop v range for liquids
ie... water, alcohol
what is prop v range for solids
ie... lead, steel , diamonds
1322- 12,000 m/s
higher bulk modulus does what to prop v
lower bulk modulus does what to prop v
power is directly proportional to
What does the transmit power button control?
changes the signals amplitude
what are alternitive names for transmit power?
intensity is directly proportional to what?
what is intensity equasion?
Beam area m
what is the power equasion for dB
dB= 10 x log(
Pf is power final
pi is power initial
what is the amplitude equasion for dB
dB= 20*log (
af is amplitude final
ai is amplitude initial