SPI Ultrasound Physics- Questions Practice Exam
SPI Ultrasound Physics- Questions Practice Exam
What are the units of Wavelength? Correct Answer: millimeters
What are the units of Frequency? Correct Answer: Hertz
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SPI Ultrasound Physics- Questions Practice Exam
SPI Ultrasound Physics- Questions Practice Exam
What are the units of Wavelength? Correct Answer: millimeters
What are the units of Frequency? Correct Answer: Hertz
What are the units of Intensity? Correct Answer: Watts/cm 2
What are the units of propagation speed? Correct Answer: meters/sec
What are the units of period? Correct Answer: second
power Correct Answer: watts
Wavelength is determine by ________. Correct Answer: medium and sound
source
Frequency is determine by ________. Correct Answer: sound source
Intensity is determine by ________. Correct Answer: sound source
Propagation speed is determine by ________. Correct Answer: medium
Period is determine by ________. Correct Answer: sound source
Power is determine by ________. Correct Answer: sound source
Which parameters can be changed by the operator? Correct Answer: Amplitude,
intensity, power
The power in the beam is 1 watt and the area is 5cm2. What is the beam's
intensity? Correct Answer: 0.2 w/cm2
If intensity remains the same while the power is doubled, what happens to beam
area? Correct Answer: doubled
If frequency of sound is doubled, what happens to wavelength? Correct Answer:
Wavelength is halved.
A+
Pulse duration Correct Answer: is the time from the start of a pulse to the end of
that pulse.
Pulse repetition period Correct Answer: is the time from the start of a pulse to the
start of the next pulse.
Pulse repetition frequency Correct Answer: is the reciprocal of pulse repetition
period.
When changing the imaging depth, which paramters dos the operator also changes?
Correct Answer: Pulse repetition frequency, duty factor, pulse repetition period.
A signal's power increases from 1watt to 100 watts. How is this expressed in
decibels? Correct Answer: 20 dB
The power of a system is at 100% and this is 0 dB. What is the dB change when
the system's power is 50%? Correct Answer: -3dB means half.
The power of a system is at 100% and this is 0 dB. The system is changed to -6dB.
What is the system's power? Correct Answer: 25% power
An ultrasound system is operating at 100% power and the power setting is 0dB.
What would the power setting be when the system is operating at 10% power?
Correct Answer: -10dB
A reduction of intensity to one-half
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