typical values for period
0.06-0.5 micro sec
typical values of frequency
Amplitude can have units of:
pascals, grams/cm^3, cm, dB
typical values for intensity
typical value for wavelength
typical values for propagation speed
equation for wavelength
wavelength (mm)= 1.54 (mm/micro sec)/ frequency (MHz)
typical values for pulse duration
.5-3 micro sec
cycles in pulse x period
typical values for PRP
100 micro sec to 1 msec
typical values of PRF
1000 to 10000 Hz
typical value of duty factor
0.1 % to 1 %
.001 to .01
Duty factor =
pulse duration/ PRP
What typ of imaging has high PRF, high duty factor, and short PRP?
typical values of spatial pulse length
0.1 to 1 mm
spatial pulse length=
number of cycles x wavelength
what type of imaging has low PRF, low duty factor, and long PRP?
intensity most relevent to tissue heating?
decibles have what type of scale?
units for attenuation coefficient
attenuation coefficient in soft tissue
impedance is ______ not _________.
calculated, not measured
typical values for impedance
1,250,000 and 1,750,000 rayls
oblique incidence and different speeds
sine (transmission angle)=prop speed 2
sine (incident angle)=prop speed 1
A property of certain materials to create a voltage when pressure is applied?
Q factor =
axial resolution equation in soft tissue
.77 x # cycles in pulse/ freq