Humanities Midterm Exam with all Correct & 100%
Verified Answers |Actual Complete Update |Already
Graded A+
Which gain will increase the risk of bioeffects?
a. transmit
b. receive
c. gain
d. overall gain ✔Correct Answer-a. transmit
Which of the following is considered the memory of an ultrasound instrument?
a. pulser
b. transducer
c. receiver
d. beam former
e. digital scan converter
f. display monitor ✔Correct Answer-e. digital scan converter
Spectral broadening suggest:
a. laminar flow
b. turbulent flow
c. flow away from the transducer
d. flow towards the transducer ✔Correct Answer-b. turbulent flow
With pulse wave Doppler axial resolution: ✔Correct Answer-degrades
What color is usually use in color flow Doppler variance map to indicate turbulent flow?
✔Correct Answer-green
Doppler high pass filter eliminates: ✔Correct Answer-high amplitude signals; low velocity flow
The Doppler wall filter is considered a: ✔Correct Answer-high pass filter
The Nyquist Limit is equal to:
a. propagation speed x frequency
b. propagation speed/ wavelength
c. PRF/2
d. 4xV^2 ✔Correct Answer-c. PRF/2
Multiple echoes, equally spaced originating from a gas bubble is called:
a. comet tail
, b. ring down
c. slice thickness artifact
d. multipath ✔Correct Answer-b. ring down
An increase in red blood cell velocity will_____ the Doppler Shift:
a. increase
b. decrease
c. not change
d. cannot be predicted ✔Correct Answer-a. increase
The primary advantage of CW Doppler is:
a. range resolution
b. range discrimination
c. range ambiguity
d. range gating
e. absence of sampling rate ✔Correct Answer-e. absence of sampling rate
The range for ultrasound begins:
a. 20 Hz
b. 20,000 Hz
c. 2 MHz
d. 15 MHz ✔Correct Answer-b. 20,000 Hz (useful frequency range for clinical imaging is
2MHz-10MHz)
Which instrument control affects the amplitude (dB) of the outgoing signal:
a. gain
b. receiver gain
c. TGC
d. transmit gain
e. overall gain ✔Correct Answer-d. transmit gain; amplitude can be affected by the
sonographer
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 ✔Correct Answer-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
Pulse repetition frequency ✔Correct Answer-Number of pulses that an ultrasound system
transmits into the body each second. Hz. Typically 4-15 KHz. PRF and depth of a view are
inversely related: When system is imaging deeper, the pulse repetition frequency is lower.
Also the number of pulses created each second
Verified Answers |Actual Complete Update |Already
Graded A+
Which gain will increase the risk of bioeffects?
a. transmit
b. receive
c. gain
d. overall gain ✔Correct Answer-a. transmit
Which of the following is considered the memory of an ultrasound instrument?
a. pulser
b. transducer
c. receiver
d. beam former
e. digital scan converter
f. display monitor ✔Correct Answer-e. digital scan converter
Spectral broadening suggest:
a. laminar flow
b. turbulent flow
c. flow away from the transducer
d. flow towards the transducer ✔Correct Answer-b. turbulent flow
With pulse wave Doppler axial resolution: ✔Correct Answer-degrades
What color is usually use in color flow Doppler variance map to indicate turbulent flow?
✔Correct Answer-green
Doppler high pass filter eliminates: ✔Correct Answer-high amplitude signals; low velocity flow
The Doppler wall filter is considered a: ✔Correct Answer-high pass filter
The Nyquist Limit is equal to:
a. propagation speed x frequency
b. propagation speed/ wavelength
c. PRF/2
d. 4xV^2 ✔Correct Answer-c. PRF/2
Multiple echoes, equally spaced originating from a gas bubble is called:
a. comet tail
, b. ring down
c. slice thickness artifact
d. multipath ✔Correct Answer-b. ring down
An increase in red blood cell velocity will_____ the Doppler Shift:
a. increase
b. decrease
c. not change
d. cannot be predicted ✔Correct Answer-a. increase
The primary advantage of CW Doppler is:
a. range resolution
b. range discrimination
c. range ambiguity
d. range gating
e. absence of sampling rate ✔Correct Answer-e. absence of sampling rate
The range for ultrasound begins:
a. 20 Hz
b. 20,000 Hz
c. 2 MHz
d. 15 MHz ✔Correct Answer-b. 20,000 Hz (useful frequency range for clinical imaging is
2MHz-10MHz)
Which instrument control affects the amplitude (dB) of the outgoing signal:
a. gain
b. receiver gain
c. TGC
d. transmit gain
e. overall gain ✔Correct Answer-d. transmit gain; amplitude can be affected by the
sonographer
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 ✔Correct Answer-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
Pulse repetition frequency ✔Correct Answer-Number of pulses that an ultrasound system
transmits into the body each second. Hz. Typically 4-15 KHz. PRF and depth of a view are
inversely related: When system is imaging deeper, the pulse repetition frequency is lower.
Also the number of pulses created each second
