Scanning Techniques

• What shape is the scanner used in CT scans?

  Doughnut-shaped
• How does a CT scan create images of the brain?

  By rotating around the person to take lots of X-rays of the brain.

  Images are taken from different angles and are combined to build up a detailed picture.
• What is a primary strength of CT scans?

  Reveals abnormal structures like tumors
• Why are CT scans considered to provide higher quality images than traditional X-rays?(Strength)

  They combine multiple angles for detail
• What is a weakness of CT scans?

  Requires more radiation than X-rays
• What type of images do CT scans produce

  Still images (Weakness)
• What is injected into the patient during a PET scan?

  A radioactive substance like glucose
• How is brain activity displayed in a PET scan?

  On a computer screen
• What is a primary strength of PET scans?

  Shows brain in action
• How do PET scans show localization of function?

  When a person performs a specific task (Strength)
• What is a weakness of PET scans?

  They are expensive
• Why are PET scan images difficult to interpret?

  Due to the complexity of brain activity
• What ethical issue is associated with PET scans?

  Injection of radioactive substance
• What does an fMRI scan measure?

  Changes in blood oxygen levels
• How is brain activity displayed in an fMRI scan?

  As 3D images on a computer screen
• What is a primary strength of fMRI scans?

  Shows brain in action
• What is another strength of fMRI scans?

  Clear images
• What is a significant advantage of fMRI scans over other imaging techniques?

  No radiation exposure
• What is a weakness of fMRI scans?

  They are expensive
• Why must a person remain still during an fMRI scan?

  To avoid blurring of images
• What is the time lag associated with fMRI scans?

  Between activity and image appearing