(a(i))[1]
State, for an X-ray image, what sharpness means.
(a(ii))[1]
State, for an X-ray image, what contrast means.
(b)[3]
A parallel X-ray beam travels through $2.3\,\text{cm}$ of soft body tissue. The intensity of the beam after emerging is $12\%$ of the incident intensity. Calculate the linear attenuation (absorption) coefficient $\mu$ for the soft body tissue. Include a unit in your answer.
(c)[2]
In medical diagnosis, X-rays can be used either to form a single X-ray image or in computed tomography (CT scanning). Suggest one advantage and one disadvantage of CT scanning compared with single X-ray imaging for diagnosis.