Ultrasound scanning
- what is it?
- how is it done?
- why and when is it used?
- advantages
- disadvantages
- Created by: sadlergeorgia
- Created on: 14-06-15 16:33
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- Ultrasound scanning
- what is it?
- uses a transducer to produce a beam of high frequency sound waves
- penetrates some soft tissues
- partially reflected from surfaces
- sound is reflected off surfaces back to a transducer
- messages passed back to a computer
- produces a real time moving image on a screen
- gel used for good contact
- uses a transducer to produce a beam of high frequency sound waves
- how is it done?
- oily gel on abdoment
- ensures good contact between skin and transducer
- transducer placed on skin over the part of the body that needs to be scanned
- receiver alongside transducer
- detect sound reflected from surfaces inside the body
- computer software used to process data and produce an image of tissues
- oily gel on abdoment
- why and when is it used?
- scan a foetus in the womb
- 12th and 20th week of pregnancy
- useful information
- whether there is more than one foetus
- stage of development
- help a practitioner position a needle accurately
- test procedures such as amniocentesis or chorionic villi sampling
- observe condition of other structures and organs
- liver/kidneys
- show presence of kidney stones / gallstones
- scan a foetus in the womb
- advantages
- can show presence of neural tube defects
- spina bifida
- patient can decide whether they want to terminate pregnancy
- low risk of harm
- real time moving image
- relatively cheap
- can show presence of neural tube defects
- disadvantages
- images are a poor quality
- don't show a lot of detail
- cannot go through bone
- images are a poor quality
- what is it?
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