ARDMS SPI ALL TEST PAPER ANSWERS AND
QUESTIONS SET A+
✔✔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
✔✔Increasing propagation speed: - ✔✔air, soft tissue, bone
✔✔The most common type of transducer used in echo is: - ✔✔sector phased array
✔✔Decibels are the units for all of the following except:
a. amplitude
b. transmit gain
c. gain
d. attenuation
e. TGC
f. dynamic range
e. intensity - ✔✔e. intensity= mW/cm2
✔✔What are the four acoustic variables: - ✔✔1. temperature, density, particle motion,
pressure
✔✔Frequency is - ✔✔Cycles per second (Hz)
not affected by sonographer
increase frequency; decrease depth
✔✔Pulse duration - ✔✔period (ms) x # of cycles in a pulse
✔✔Wavelength - ✔✔the length of one cycle
wavelength= propagation speed/ frequency
, 1.54/3MHz= .5mm
✔✔An increase in packet size will _______ the frame rate - ✔✔Decrease
✔✔The range for audible sound is: - ✔✔20 Hz- 20kHz
✔✔The wavelength of a 1MHz transducer is: - ✔✔1.54/1= 1.54mm
✔✔The average speed of sound in soft tissue is: - ✔✔1540m/s; 1.54km/s; 1.54mm/us
✔✔An increase in overall gain will result in all of the following except:
a. increase in image brightness
b. increase in output power
c. increase in amplification of the returning signal
d. decrease risk in bioeffects - ✔✔b. increase in power
✔✔Reject eliminates: - ✔✔low amplitude signals
✔✔There have been no proven biological effects for unfocused transducers for
intensities below: - ✔✔100mW/cm2 SPTA
✔✔The primary cause of attenuation of ultrasound in soft tissue is caused by: -
✔✔absorption
✔✔Resolution artifact - ✔✔When two structures parallel to the ultrasound beam are
displayed as one reflector.
✔✔Damping does not decrease: - ✔✔bandwidth
✔✔Spectral Broadening - ✔✔The widening of the doppler shift spectrum. Meaning the
increase of the range of doppler shift frequencies present, owing to a broader range of
flow speeds encountered by the sound beam.
✔✔Refraction - ✔✔Change in direction of a wave when it changs speed as in travels
from one material to another. The change in the direction of sound as it crosses a
boundary.
✔✔autocorrelation - ✔✔used to convert Doppler shift information into color.
✔✔PRF - ✔✔Pulse Repetition Frequency. The rate at which pulses are transmitted,
given in hertz or pulses per second; reciprocal of pulse-repetition time.
✔✔Period - ✔✔the time per cycle
1-10usec
QUESTIONS SET A+
✔✔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
✔✔Increasing propagation speed: - ✔✔air, soft tissue, bone
✔✔The most common type of transducer used in echo is: - ✔✔sector phased array
✔✔Decibels are the units for all of the following except:
a. amplitude
b. transmit gain
c. gain
d. attenuation
e. TGC
f. dynamic range
e. intensity - ✔✔e. intensity= mW/cm2
✔✔What are the four acoustic variables: - ✔✔1. temperature, density, particle motion,
pressure
✔✔Frequency is - ✔✔Cycles per second (Hz)
not affected by sonographer
increase frequency; decrease depth
✔✔Pulse duration - ✔✔period (ms) x # of cycles in a pulse
✔✔Wavelength - ✔✔the length of one cycle
wavelength= propagation speed/ frequency
, 1.54/3MHz= .5mm
✔✔An increase in packet size will _______ the frame rate - ✔✔Decrease
✔✔The range for audible sound is: - ✔✔20 Hz- 20kHz
✔✔The wavelength of a 1MHz transducer is: - ✔✔1.54/1= 1.54mm
✔✔The average speed of sound in soft tissue is: - ✔✔1540m/s; 1.54km/s; 1.54mm/us
✔✔An increase in overall gain will result in all of the following except:
a. increase in image brightness
b. increase in output power
c. increase in amplification of the returning signal
d. decrease risk in bioeffects - ✔✔b. increase in power
✔✔Reject eliminates: - ✔✔low amplitude signals
✔✔There have been no proven biological effects for unfocused transducers for
intensities below: - ✔✔100mW/cm2 SPTA
✔✔The primary cause of attenuation of ultrasound in soft tissue is caused by: -
✔✔absorption
✔✔Resolution artifact - ✔✔When two structures parallel to the ultrasound beam are
displayed as one reflector.
✔✔Damping does not decrease: - ✔✔bandwidth
✔✔Spectral Broadening - ✔✔The widening of the doppler shift spectrum. Meaning the
increase of the range of doppler shift frequencies present, owing to a broader range of
flow speeds encountered by the sound beam.
✔✔Refraction - ✔✔Change in direction of a wave when it changs speed as in travels
from one material to another. The change in the direction of sound as it crosses a
boundary.
✔✔autocorrelation - ✔✔used to convert Doppler shift information into color.
✔✔PRF - ✔✔Pulse Repetition Frequency. The rate at which pulses are transmitted,
given in hertz or pulses per second; reciprocal of pulse-repetition time.
✔✔Period - ✔✔the time per cycle
1-10usec
