The average speed of sound in soft tissue is:
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1540m/s; 1.54km/s; 1.54mm/us
Wavelength
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the length of one cycle
wavelength= propagation speed/ frequency
1.54/3MHz= .5mm
The Doppler wall filter is considered a:
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high pass filter
Increasing wavelength will ___________ frequency.
a. increase
b. decrease
c. not change
d. cannot be predicted.
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b. decrease
The wavelength of a 1MHz transducer is:
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1.54/1= 1.54mm
, A reflection will occur at the boundary of two media if the acoustic impedences of the
two media are:
a. equal
b. different
c. unchanged
d. cannot be predicted
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b. different
Which of the following is used to convert Doppler shift information into color:
a. high PRF
b. fast Fourier transform
c. autocorrelation
d. time interval histogram
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c. autocorrelation
b is incorrect because fast Fourier transform is the method used to process
conventional Doppler shift information but is too slow a method for color
Doppler
The primary advantage of CW Doppler is:
a. range resolution
b. range discrimination
c. range ambiguity
d. range gating
e. absence of sampling rate
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1540m/s; 1.54km/s; 1.54mm/us
Wavelength
,Give this one a try later!
the length of one cycle
wavelength= propagation speed/ frequency
1.54/3MHz= .5mm
The Doppler wall filter is considered a:
Give this one a try later!
high pass filter
Increasing wavelength will ___________ frequency.
a. increase
b. decrease
c. not change
d. cannot be predicted.
Give this one a try later!
b. decrease
The wavelength of a 1MHz transducer is:
Give this one a try later!
1.54/1= 1.54mm
, A reflection will occur at the boundary of two media if the acoustic impedences of the
two media are:
a. equal
b. different
c. unchanged
d. cannot be predicted
Give this one a try later!
b. different
Which of the following is used to convert Doppler shift information into color:
a. high PRF
b. fast Fourier transform
c. autocorrelation
d. time interval histogram
Give this one a try later!
c. autocorrelation
b is incorrect because fast Fourier transform is the method used to process
conventional Doppler shift information but is too slow a method for color
Doppler
The primary advantage of CW Doppler is:
a. range resolution
b. range discrimination
c. range ambiguity
d. range gating
e. absence of sampling rate
