664216
Description
Mind Map by Mscholes24, updated more than 1 year ago
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Created by Mscholes24
about 11 years ago
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Ultra sound
- They have a frequency of above 20,000 hz
- We cannot hear them because it is above our human hearing range
- They can be produced form animals such as bats and dolphins and some electronic
devices
- They can be produced form animals such as bats and dolphins and some electronic
devices
- We cannot hear them because it is above our human hearing range
- Reflections
- when ultrasound reaches a boundary between to medias of
different densities they are reflected. They remainder
continues to travel through
- Detectors can be used to measure the times
between the waves reflections and calculate a
distance using the formula distance= speed x time
- when ultrasound reaches a boundary between to medias of
different densities they are reflected. They remainder
continues to travel through
- Medical uses
- The human body is composed of different tissues which when
ultrasound is passed through can be detected, when it reaches
boundaries
- These waves can be used in pre-natal
scanning to check to see whether the
foetus is growing normally. Computers
combine the ultrasound detections to
produce an image
- Ultrasound can also be used for diagnostics. Such as organs like the liver.
- Used to remove kidney stones
- Crystal which form from compounds found in
urine, they can cause blockages in the ureter.
- The high frequency ultrasound waves can be directed at
the stone and cause it to vibrate which make sit break down
into smaller pieces and be passed in the urine
- Crystal which form from compounds found in
urine, they can cause blockages in the ureter.
- The human body is composed of different tissues which when
ultrasound is passed through can be detected, when it reaches
boundaries
- Comparing ultrasounds and x-rays
- X-rays have a shorter wave length and higher frequency, meaning
that x-rays produce higher quality images
- Showing greater clarity and detail, which can be vital to determines
fractures etc
- CT scans produce even clearer image ( still use x-rays) and produce a
3D image allowing them to look at the different layers at different angles,
without objects obscurring the image ( like with an x-ray)
- CT scans produce even clearer image ( still use x-rays) and produce a
3D image allowing them to look at the different layers at different angles,
without objects obscurring the image ( like with an x-ray)
- Showing greater clarity and detail, which can be vital to determines
fractures etc
- x-rays are ionising which means they can damage living tissue
- Dividing cells can be most vulnerbable to the radiation
- Ultrasound is not ionising so it is much safer when perforimng pre-natal scans
- Dividing cells can be most vulnerbable to the radiation
- X-rays have a shorter wave length and higher frequency, meaning
that x-rays produce higher quality images
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