Medical

Question 0

Why are X-ray images visible?

Answer 0

Visible because different tissues absorb and scatter different amounts of radiation.

Question 1

Four things can happen to an X-ray photon when it enters tissue (or any other liquid/solid) …….

Answer 1

1. Can pass through with no interaction.
2. Can be absorbed and release energy into surrounding tissue.
3. Can be scattered and emerge in different direction, usually some loss of energy into tissue occurs.
4. A combination of the processes, such as scattering followed by absorption.

Question 2

Difference between soft tissue and bone on X-ray images?

Answer 2

Soft tissue requires lower energy than bone and transmits most of the X-rays. The transmitted radiation appears black.
Bone is more dense than tissue and absorbs most of the radiation, which appears paler (white).

Question 3

Recently, digital images have replaced film images because…..

Answer 3

They can be processed and stored electronically.

Question 4

How do X-ray photons interact with air?

Answer 4

There is very little interaction.

Question 5

What is attenuation / reduction of the xray beam?

Answer 5

The use of a vast number of photons in an X-ray beam, intended to reduce the number of X-rays in the beam. When the beam emerges there is only a fraction of the original number of photons.

Question 6

The issue with attenuating X-rays is…..

Answer 6

It can be hard to distinguish between different organs and cancer tissues because there is not always a clear density difference between them.