EDELMAN CHAPTER 14 EXAM
QUESTIONS AND ANSWERS 100% PASS
What are the two major functions of the ultrasound system? - ANS preparation and
transmission of electrical signals to the transducer, which creates a sound beam
reception and processing of electrical signals from the transducer
what are the six major components of the ultrasound system? - ANS transducer, pulser and
beam former, receiver, display, storage, and master synchronizer
what is the function of the transducer? - ANS during transmission, it converts electrical
energy into acoustic energy
during reception, it converts the returning acoustic energy into electrical energy
what is the function of the pulser and beam former? - ANS create and control the electrical
signals sent to the transducer that generate sound pulses
the pulser determines the amplitude, PRP, and PRF, while the beam former determines the
firing delay patterns for phased array systems
does the pulser function during transmission or reception? - ANS during transmission
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 12
, can the sonographer adjust the voltage of the pulser? - ANS yes, the sonographer can adjust
the magnitude of the pulser's electrical voltage spike, which ranges from near 0 to around 100
volts
what happens when the pulser is set to a low voltage? - ANS the PZT vibrates gently and
transmits weak sound beams into the body
the reflected echoes are weak, and the entire image is dark
what happens when the pulser is set to a high voltage? - ANS the PZT vibrates more forcefully
and transmits stronger sound beams into the body
the reflected echoes are stronger, and the entire image is brighter
what are some synonyms for pulser voltage? - ANS output gain, acoustic power, pulser
power, energy output, transmitter output, power, or gain (gain is a vague term and should be
avoided)
what two measurements of transducer output appear on modern ultrasound displays? -
ANS thermal index (TI) and mechanical index (MI)
what effect does changing the transducer output have on the image? - ANS changing
transducer output changes all of the pulses transmitted to the body and all of the reflections
received from boundaries between anatomic structures (brightness of the entire image
changes)
are lower or higher pulser voltages more desirable? - ANS generally, as long as image quality
is optimal, lower pulser voltages are more desirable because they decrease transmitted acoustic
energy and minimize patient exposure to ultrasonic energy (lower risk of bioeffects)
can output power alone make an image of uniform brightness from top to bottom? - ANS no
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 12
QUESTIONS AND ANSWERS 100% PASS
What are the two major functions of the ultrasound system? - ANS preparation and
transmission of electrical signals to the transducer, which creates a sound beam
reception and processing of electrical signals from the transducer
what are the six major components of the ultrasound system? - ANS transducer, pulser and
beam former, receiver, display, storage, and master synchronizer
what is the function of the transducer? - ANS during transmission, it converts electrical
energy into acoustic energy
during reception, it converts the returning acoustic energy into electrical energy
what is the function of the pulser and beam former? - ANS create and control the electrical
signals sent to the transducer that generate sound pulses
the pulser determines the amplitude, PRP, and PRF, while the beam former determines the
firing delay patterns for phased array systems
does the pulser function during transmission or reception? - ANS during transmission
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 12
, can the sonographer adjust the voltage of the pulser? - ANS yes, the sonographer can adjust
the magnitude of the pulser's electrical voltage spike, which ranges from near 0 to around 100
volts
what happens when the pulser is set to a low voltage? - ANS the PZT vibrates gently and
transmits weak sound beams into the body
the reflected echoes are weak, and the entire image is dark
what happens when the pulser is set to a high voltage? - ANS the PZT vibrates more forcefully
and transmits stronger sound beams into the body
the reflected echoes are stronger, and the entire image is brighter
what are some synonyms for pulser voltage? - ANS output gain, acoustic power, pulser
power, energy output, transmitter output, power, or gain (gain is a vague term and should be
avoided)
what two measurements of transducer output appear on modern ultrasound displays? -
ANS thermal index (TI) and mechanical index (MI)
what effect does changing the transducer output have on the image? - ANS changing
transducer output changes all of the pulses transmitted to the body and all of the reflections
received from boundaries between anatomic structures (brightness of the entire image
changes)
are lower or higher pulser voltages more desirable? - ANS generally, as long as image quality
is optimal, lower pulser voltages are more desirable because they decrease transmitted acoustic
energy and minimize patient exposure to ultrasonic energy (lower risk of bioeffects)
can output power alone make an image of uniform brightness from top to bottom? - ANS no
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 12
