RSAP Learning Outcome #4

What is meant by a Compton interaction?

• Incoming x-ray photon interacts with an inner shell electron 

• A primary photon reacts with an outer shell electron and changes direction

• Interaction that takes place when electrons interact with the anode

• Occurs when incident electron interacts with the force field of the nucleus

The contrast between bone and soft tissue is due primarily to:

• Their similar densities

• The difference between their atomic numbers

• Different abilities to absorb contrast materials

• Difference in part thickness

Increasing collimation _________ patient dose.

• Increases

• Decreases

• Does not affect

• Cannot be measured

Which is the most common beam restricting device used in radiography?

• Aperture Diaphragm

• Cones

• Cylinders

• Collimator

TRUE OR FALSE: If source to collimator distance (SID) is decreased, penumbra will be smaller.

• True

• False

Answer explanation

If SID is increased, penumbra will be smaller.

What is photoelectric absorption?

• Incoming x-ray photon interacts with an inner shell electron

• A primary photon reacts with an outer shell electron and changes direction

• Interaction that takes place when electrons interact with the anode

• Occurs when incident electron interacts with the force field of the nucleus

How are Compton interactions and photoelectric absorption affected by kVp?

• As kVp increases, Compton interactions decrease, and photoelectric interactions decrease

• As kVp increases, Compton interactions increase, and photoelectric interactions decrease

• As kVp increases, Compton interactions increase, and photoelectric interactions increases

• As kVp increases, Compton interactions increase, and photoelectric interactions remain the same

When an x-ray photon passes through matter, it undergoes a process called _______.

• Scattering

• Leakage

• Off-Focus

• Attenuation

As more photons pass through the irradiated material unattenuated, the resulting image receptor exposure will _______.

• Decrease

• Increase

• Stay the same

• Cannot be measured

When x-ray photons interact with matter and change direction, the process is called_______.

• Absorption

• Resonance

• Scatter

• Extrapolation