Explain how X-rays are produced for use in medical diagnosis.
State why X-ray images are taken of multiple sections of the body during computed tomography (CT) scanning.
An X-ray image is taken of the structure shown in the figure below.
The linear attenuation coefficient of bone is 
. The linear attenuation coefficient of soft tissue is 
. The incident X-rays are parallel and have a uniform intensity 
across the structure. Determine, in terms of , the intensity of the detected X-rays from:
point P
point Q.
Explain, with reference to your answers in (b), whether the X-ray image of the structure in the figure above has good contrast.
.
.
