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ARDMS SPI EXAM LATEST REAL EXAM 150 QUESTIONS AND CORRECT ANSWERS
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ARDMS SPI EXAM LATEST REAL EXAM 150 QUESTIONS AND CORRECT ANSWERS
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ARDMS SPI EXAM LATEST REAL EXAM 150QUESTIONS AND CORRECT ANSWERS
The range for ultrasound begins:
a. 20 Hz
b. 20,000 Hz
c. 2 MHz
d. 15 MHz - 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 - 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 - 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 - 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
The best way to increase the near field length of an ultrasound beam is to: - increase
transducer diameter
The range of frequencies produced by a damped PZT element is called:
a. fundamental frequencies
b. Q Factor
c. near field
d. bandwith - d. bandwidth
The percentage of time that the ultrasound instrument is emitting ultrasound is called:
a. PRF
b. pulse duration
c. pulse repetition period
,d. duty factor - d. duty factor; the maximum value is 1, the minimum is 0
The unit of duty factor is:
a. Hz
b. mm
c. ms
d. unitless - d. unitless
Quality Factor= Fundamental frequency/ bandwidth - This allows doses of different
types of radiation to be compared for their biological effects.
Clinical imaging transducers are: - wide bandwidth; low q factor
Power/area= - Intensity
Which gain will increase the risk of bioeffects?
a. transmit
b. receive
c. gain
d. overall gain - 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 - e. digital scan converter
Spectral broadening suggest:
a. laminar flow
b. turbulent flow
c. flow away from the transducer
d. flow towards the transducer - b. turbulent flow
With pulse wave Doppler axial resolution: - degrades
What color is usually use in color flow Doppler variance map to indicate turbulent flow? -
green
Doppler high pass filter eliminates: - high amplitude signals; low velocity flow
The Doppler wall filter is considered a: - high pass filter
The Nyquist Limit is equal to:
,a. propagation speed x frequency
b. propagation speed/ wavelength
c. PRF/2
d. 4xV^2 - 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 - 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 - 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 - e. absence of sampling rate
Increasing wavelength will ___________ frequency.
a. increase
b. decrease
c. not change
d. cannot be predicted. - b. decrease
All of the following directly affect frame rate except:
a. depth of penetration
b. field of view
c. number of focuses
d. line density
e. beam width - e. beam width
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 - b. different
A mechanical transducer utilizes:
a. transmit focus
, b. receive focus
c. fixed focus
d. dynamic aperture focusing - c. fixed focus; sonographer cannot determine the
location of # of foci. mechanical transducer uses cross sectional imaging, rotating
wheel, wobbler, oscillating mirror
The transducer frequency is primarily determined by the transducer element:
a. diameter
b. thickness
c. propagation speed
d. type - b. thickness
A strongly focused transducer implies a:
a. short focal length; decreased beam divergence
b. medium focal length; increased beam divergence
c. long focal length; no beam divergenc
d. short focal length; increased beam divergence - d. short focal length; increased beam
divergence
B-mode displays reflector:
a. amplitude and distance
b. amplitude and velocity
c. power and direction
d. depth and speed - a. amplitude and distance
An increase in the number of pixels on the display will improve: - detail resolution
Propagation speed is determined by:
a. frequency
b. harmonics
c. bandwidth
d. bulk modulus - d. bulk modulus
Increasing transmit gain increases everything except: - frequency
The correct depth placement of reflectors depends primarily upon:
a. frequency
b. period
c. power
d. propagation speed - d. propagation speed
Which of the following will increase the color flow jet area displayed?
a. increase color gain
b. increase velocity scale
c. increase frequency - a. increase color gain
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