Distinguish between sharpness and contrast in X-ray imaging.
State two causes of loss of sharpness of an X-ray image.
Data for the linear attenuation (absorption) coefficient 
of X-ray photons are given in the figure below.
A parallel beam of X-rays is incident, separately, on a thickness of 
of bone and on a muscle of thickness 
.
Calculate the ratio
Use your answer in (i) to suggest whether an X-ray image of the bone and muscle would show good or poor contrast.
