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SPI Ultrasound Physics- Questions Practice Exam

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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? Correc ... t 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 [Show More]

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