Basic physics of ultrasound & Artifacts
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1 / 10
Operating frequency is determined by the:
Propagation speed and thickness of the element determine the operating frequency
2 / 10
Frequency is directly proportional to:
Frequency is proportional to image quality and attenuation. Wavelength, period, and penetration depth are inversely proportional to frequency
3 / 10
Using multiple focal zones will decrease resolution
4 / 10
The portion of time the transducer is transmitting a pulse is termed:
Duty factor is the fraction of time pulse ultrasound is transmitting. Period is the time to complete one cycle
5 / 10
How would the sonographer improve this image using only one operator control?
The near zone is under gained. Increasing the time-gain compensation in the near field is the first option for the sonographer to improve this image. The focal zone is placed appropriately. Increasing the number of focal zones or decreasing the imaging depth would not increase the near field gain.
6 / 10
Overall gain control caused overall brightness of all displayed echoes
7 / 10
For refraction to occur, which of the following must take place?
Oblique incidence and a change of velocity or propagation speed between the media must take place for refraction to occur.
8 / 10
What artifact displays a series of closely spaced echoes distal to a strong reflector?
Comet-tail artifact displays a series of closely spaced reverberation echoes behind a strong reflector
9 / 10
Which of the following techniques provides quantitative data?
Spectral analysis allows visualization of the Doppler signal providing quantitative data, including peak, mean, and minimum flow velocities, flow direction, and flow characteristics
10 / 10
In color flow doppler we can detect movement and direction:
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