Basic physics of ultrasound & Artifacts
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1 / 10
Frequency is directly proportional to:
Frequency is proportional to image quality and attenuation. Wavelength, period, and penetration depth are inversely proportional to frequency
2 / 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.
3 / 10
Operating frequency is determined by the:
Propagation speed and thickness of the element determine the operating frequency
4 / 10
Overall gain control caused overall brightness of all displayed echoes
5 / 10
Using multiple focal zones will decrease resolution
6 / 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
7 / 10
In color flow doppler we can detect movement and direction:
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
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.
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