Materials used for the matching layer of a transducer must have an impedance between
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impedance levels of the ______________ - (correct answer) -skin and PE element
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Which of the following is an abnormality that would lead to an imcrease in the Reynolds
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number? - (correct answer) -stenosis of the vessel
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If a 3.5 MHz wave is transmitted through the media listed below, the longest wavelength
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will be seen in the wave moving through ____________ - (correct answer) -bone
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The speed of sound is fastest in bone. Longer wavelengths occur with faster propagation
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speeds
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If you are using a transducer with a 100 microsecond pulse repetition perios, a Doppler
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shift greater than ____________ will lead to aliasing on the display. - (correct answer) -5
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kHz
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Which of the following persistence levels should be used to optimize color Doppler
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imaging of cardiac structures? - (correct answer) -Low
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Which of the following artifacts can NOT be corrected by increasing the wall filter setting? -
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(correct answer) -aliasing artifact j. j. j.
What changes occur to the ultrasound beam when timed pulses are emitted from the edge
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elements to the center elements of the phased transducer - (correct answer) -electronic
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focusing occurs
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Which of the following correctly describes Power Doppler - (correct answer) -Color display
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is not angle dependent
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Which of the following lists the normal range of intensities used in diagnostic Doppler US?
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- (correct answer) -0.2-400 mW/cm
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- Average range of diagnostic intensities for all types of US imaging: 2 - 500 mW/cm^2
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- 2D imaging intensities are less than w/ Doppler
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- Average range of Doppler intensities: 0.2-400 mW/cm^2
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