Acoustic ultrasound gel is applied to the skin to
A. a) Allow good transmission of sound waves into the body.
B. b) Lubricate the skin.
C. c) Increase the amount of ultrasound scatter.
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Focal zones are used to
A. a) Diverge the ultrasound beam.
B. b) Scatter the ultrasound beam.
C. c) Narrow the ultrasound beam.
Primary shapes of transducers are
A. a) Round and square.
B. b) Linear and curved.
C. c) Oblong and trapezoid.
M-mode can be used to demonstrate
A. a) Blood flow.
B. b) Tissue motion.
C. c) Gall stones.
When an ultrasound beam passes, at an angle other than 90°, from a tissue with a lower speed of sound (C1) to one with a higher speed of sound (C2), the beam will
A. a) Be deflected toward the normal.
B. b) Be deflected away from the normal.
C. c) Remain on its original path.
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