ARDMS SPI ALL STUDY GUIDE ANSWERS AND
QUESTIONS SET A+
✔✔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
✔✔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
QUESTIONS SET A+
✔✔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
✔✔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
