brain scans

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12 Terms

1
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CT scan

cross sectional image taken to build a detailed picture

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CT scan pros

  • helps reveal abnormal structures

  • higher quality than x-rays


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CT scan cons

  • can’t be used often

  • no activity

  • more harmful than x-rays


4
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PET scan

measures metabolic activity using radioactive tracer like glucose

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brain is very active on PET scan

colour red

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brain is moderately active on PET scan

colour yellow

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brain is less active on PET scan

colour blue

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PET scan strength

  • shows localisation


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PET scan cons

  • more expensive than CT

  • can’t be done often


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FMRI scan

measures changes of blood oxygen levels

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FMRI scan pros

  • shows brain activity

  • very safe

  • very clear images


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FMRI scan cons

  • expensive

  • need to be very still

  • 5 second delay between activity and image