Ultrasound

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1. Why are Ultrasound waves not useful for examining lungs?

  • Because the lungs are constantly contracting due to the patient breathing.
  • Because they do not travel in air.
  • Because the lungs are surrounded by the ribs which reflects the Ultrasound waves.
  • Because the Ultrasound waves are not strong enough to produce an image of the lungs.
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2. Why do Ultrasound scans reacquire gel?

  • To ensure that the ultrasound waves can tell the difference between the air and the patient.
  • To ensure that there is no air between the ultrasound transducer and the patients skin.
  • To attract the ultrasound waves back to the transducer to create an image on the screen.
  • To ensure that the ultrasound transducer glides smoothly over the patients skin.

3. What, other than medical uses, do Ultrasound waves have?

  • Detecting oil on the sea bed.
  • Cleaning glass.
  • Detecting fish in the sea.
  • Detecting metal under the sand (metal detectors).

4. What frequency range of sound waves can the human ear hear?

  • 20Hz to 20 000Hz
  • 10Hz to 10 000Hz
  • 5Hz to 5 000Hz
  • 50Hz to 50 000Hz

5. What happens to Ultrasound waves after a transducer has emitted pulses?

  • The waves return to the transducer all at once to create an image on a screen.
  • They travel through tissue to the other side of the body.
  • It is partially reflected from the different tissue boundaries in its path and returns to the transducer to create an image on a screen.
  • They produce images of broken bones on a screen because the waves pass through things that are not dense like bone.

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