a CT scan. to the head is equivilant to 200 CXR doses

How is a CT scan viewed?

a CT scan is viewed as if you are viewing it from a persons feet so from the foot of the bed up so the right of then image is a patients left just like in an xray

good to note that the CT machine can actually make other views eg frontal and saggital by using its computer capabilities they are not real images but it uses th epictures form the. many slices it has taken to put it togetehr

HOW ARE CORONAL AND AXIAL mri IMAGES VIEWED?

the way MRI imaging works is to use magnetic forces to line up hydrogen ions in the patients body, the protons are then ‘let go’ and they travel at different speeds to a new location, the image is taken at a point and this is how MRI imaginging works (think of runners running at different speeds then being told to stop and a picture is taken)

there are 3 properties of tissues that affect the contrast of the image

T1 recovery time

T2 decay time

Proton density (PD)

if you create an image based on one of these factors it is known as ‘’’’ weighted image

so for example - if the image is from recovery time then it is known as a T1 weighted image,