SPI practice exam 1

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*note:
- signal to noise ratio: measure of how strong a signal is relative to the background noise

• The ratio of the signal amplitude to the noise amplitude

_ The higher the SNR (signal to noise ratio), the better the image is

*To improve SNR at depth:

• use a TDR designed for penetration
• use lower frequency
• move focus down deeper
• turn off dynamic frequency
• turn off harmonics *harmonics are best at the midfield, not with the depth
• use different imaging plane

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***

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Question 84

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PRF

Question 85

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*increased image quality but decrease frame rate

Question 86

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C

*dynamic aperture is a type of receive focusing. the technique uses more crystals to receive deeper reflections than to receive shallow reflection.

It will reduce lobe artifact

Question 87

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Question 88

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Air, blood, liver, bone

*the more dense an object or media the higher the acoustic impedance levels

Question 89

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Question 90

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C

*The timed voltages produced in a convex shape will create wider beam.

*If the voltages are timed to stimulate the elements in a concave pattern, a focused beam is produced.

Question 91

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C

*spatial compounding can be used to image noise and clutter

Question 92

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C

*the speed of sound through fat is slower than soft tissue thus the reflections take longer to return to the TDR.

Question 93

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C

*the speed of sound through fat is slower than soft tissue thus the reflections take longer to return to the TDR.

Question 94

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PRF should be adjested

Question 95

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*Decreasing the dynamic range will increase the contrast of the image, causing the posterior shadowing to be more prominent

Question 96

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output power

Question 97

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C: VBF allows for improved lateral resolution without degrading temporal resolution

VBF

• very fast FR
• use receive focusing to improve detail resolution across the whole image *No transmit focusing is needed