Introduction to the X-ray Tube

What is the primary function of the cathode in an x-ray tube?

• To create free electrons through thermionic emission

• To prevent x-rays from being emitted throughout the exam room

• To absorb electrons and create x-rays

• To create an air-free vacuum

What charge does the cathode have?

• Negatively charged

• It varies

• Positively charged

• Neutral

What material is the glass envelope of an x-ray tube typically made from?

• Borosilicate glass

• Aluminum

• Regular glass

• Plastic

What is the purpose of the tube housing in an x-ray tube?

• To create an air-free vacuum

• To prevent x-rays from being emitted throughout the exam room

• To absorb electrons

• To create free electrons

What is the space charge effect?

• The process of creating x-rays at the anode

• The process of focusing the electron beam

• The process of heating the cathode to create free electrons

• The limit to the number of free electrons that can be created at the cathode

What is the advantage of using a small filament in an x-ray tube?

• It is used for large body parts

• It has a high heat capacity

• It creates a very narrow and tightly aligned electron beam

• It can be used for large mA

What type of anode is essential for general radiography?

• Stationary anode

• Rotating anode

• Dual anode

• Fixed anode

What component turns the rotating anode in an x-ray tube?

• The stator

• The bearings

• The rotor

• The induction motor

What is the purpose of the focusing cup in an x-ray tube?

• To create free electrons

• To absorb electrons

• To focus the electron beam

• To create an air-free vacuum

What is the main disadvantage of a stationary anode?

• It has a very high heat capacity

• It can only be used for very low exposures

• It is used for high exposures

• It is very complicated