Attenuation & Interactions

Question 1

what is subject contrast

Answer 1

the intensity exiting the object (person)

Question 2

how are x-rays produced?

Answer 2

• high speed e direction
• bombard target with increased Z with e’s
• x-rays emitted from the focus on the target

Question 3

How is an X-ray tube designed, and what happens to X-rays as they interact with matter

Answer 3

• Tube shielded with lead except for radiolucent window.
• X-rays that pass through window interact with matter.
• X-rays have the desire to interact with matter.
• Excess energy - need to lose to become stable

Question 4

what happens to the 3 photons when they interact with matter

Answer 4

photon A:
* Interacts with the atom and is deflected.
* May or may be not accompanied with a loss of energy.
* Known as scattering

photon B:
* Interacts with the atom.
* Loses all of its energy to the atom.
* Known as absorption

photon C:
* Passes through the material with minimal or no interaction.
* Known as transmission.

Question 5

UNFINISHED