(a(i))[1]
State, in relation to X-ray images, what sharpness means.
(a(ii))[3]
Describe briefly two factors that influence the sharpness of an X-ray image.
(b)[4]
A patient has an X-ray image taken of the skull. Another patient has a CT scan of his head. Referring to how the image is formed in each case, suggest why the radiation exposure is different in the two imaging techniques.