1. Why are Ultrasound waves not useful for examining lungs?
- Because the Ultrasound waves are not strong enough to produce an image of the lungs.
- Because the lungs are surrounded by the ribs which reflects the Ultrasound waves.
- Because they do not travel in air.
- Because the lungs are constantly contracting due to the patient breathing.
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2. What happens to Ultrasound waves after a transducer has emitted pulses?
- They produce images of broken bones on a screen because the waves pass through things that are not dense like bone.
- The waves return to the transducer all at once to create an image on a screen.
- 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 travel through tissue to the other side of the body.
3. What, other than medical uses, do Ultrasound waves have?
- Detecting oil on the sea bed.
- Detecting metal under the sand (metal detectors).
- Cleaning glass.
- Detecting fish in the sea.
4. Why do Ultrasound scans reacquire gel?
- To attract the ultrasound waves back to the transducer to create an image on the screen.
- 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 ensure that the ultrasound transducer glides smoothly over the patients skin.
5. What is an advantage of using Ultrasound waves instead of X-rays for medical scanning?
- Ultrasound waves are non-ionising and therefore harmless when used for scanning.
- Ultrasound waves produce better images than X-rays.
- Ultrasound scanners are cheaper to use than X-ray machines.
- Ultrasound waves can be used to treat cancerous cells.
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