RSAP Learning Outcome #3

What is the purpose of the cathode focusing cup?

• To alter the filament size

• Group the electrons for their passage to the anode

• Regulate the anode rotation speed

• Increase the heat capacity of the x-ray tube

Which of the following is true regarding the anode?

• Produces a thermionic cloud

• Made of nickel

• Where high speed electrons are suddenly stopped

• Negative side of the x-ray tube

Which component of the x-ray tube is the only part that is located outside of the glass envelope?

• Rotor

• Cathode

• Anode

• Stator

The following are all parts of the cathode assembly EXCEPT:

• Filament

• Bearings

• Focusing Cup

• Associated wiring

What is the purpose of the rotor?

• Funnels the electrons into a straight beam

• Acts as a target for electrons

• Rotates the anode

• Cools the x-ray tube

TRUE OR FALSE: The vacuum of the x-ray tube allows electrons to travel from the cathode to the anode without hitting any other gas atoms.

• True

• False

The heel effect...

• Exists because some x-rays are absorbed by the surface of the anode

• Is caused by the charge difference between the anode and the cathode

• Depends on the mA and kVp

• Is reduced by dual focal spots

What process occurs when no more electrons can be driven toward the anode?

• Filtration

• Line focus principle

• Anode heel effect

• Saturation current

What is a disadvantage to having a small target angle?

• Greater anode heel efect

• Greater field coverage

• Increased heat distribution and capacity

• More uniform radiographic density

________ is where photons are produced outside of the focal spot.

• Anode heel effect

• Off focus radiation

• Focal spot blooming

• Bremsstrahlung interaction