CT localisation

Question 1

components of CT scanner

Answer 1

• x-ray generator
• x-ray tube
• gantry
• couch
• detector array
• lasers
• aperture

Question 2

benefits of CT

Answer 2

• relatively open
• fast
• provides good definition
• avoids problem with overlay/ superimposition

Question 3

hounsfields units

Answer 3

unit of radiation attenuation/radio density, ‘grey-scale’

Question 4

sequential

Answer 4

• step and shoot
• time consuming
• breathing and movement misregistration

Question 5

helical

Answer 5

• continual movement

- quicker

Question 6

side effects of contrast

Answer 6

• soreness/itchiness around canula site
• headaches
• nausea/vomiting
• warm sensation/ felling the need to urinate
• chest pains
• dizziness