CAT scans

Question 1

how does it work

Answer 1

uses x rays to take multiple images (2D images called slices) of the body

the machine rotates around the patient, emitting x rays at different angles

x rays are absorbed by the brain tissue at different rates

Question 2

how do the 2D slices become 3D

Answer 2

the detectors measure the x rays that pass through the body and it sends data to a computer

the computer reconstructs the cross sectional images (slices) and shows detailed views of the internal structures

they are detailed and can show soft tissue, bone and blood vessels in high contrast in 3D images

Question 3

how much does 1 scan cost

Answer 3

£450-£600

Question 4

how long does 1 scan take

Answer 4

15-30 mins

Question 5

what is risky about these scans

Answer 5

radiation exposure can increase health risks when used repetitively

Question 6

is it invasive or non invasive

Answer 6

non invasive

Question 7

what is a limitation of these scans

Answer 7

it has a controlled, artificial setting which may not reflect real life situations as the brains responses when in a scanner may not be the same as when in a natural setting which reduces ecological validity