Radiography Exam Radiographic Equipment and Maintenance

Question 1

Which component of the x-ray tube is responsible for producing electrons through thermionic emission?

Accepted Answer

Filament (cathode)

Answer

The filament at the cathode is heated by a low-voltage current, causing thermionic emission — the release of electrons from the wire.

Question 2

The primary purpose of the rotating anode in an x-ray tube is to:

Accepted Answer

Distribute heat over a larger target area to prevent damage

Answer

The rotating anode distributes the heat generated during x-ray production over a larger area (the focal track), preventing localized overheating and extending tube life.

Question 3

The line-focus principle in x-ray tube design allows for:

Accepted Answer

A large actual focal spot that produces a small effective focal spot for improved image sharpness

Answer

The line-focus principle uses an angled anode target so that a large actual focal spot (better heat loading) projects as a small effective focal spot (better image sharpness).

Question 4

Which of the following is a quality control test that evaluates the accuracy of the x-ray beam's alignment with the light field?

Accepted Answer

Beam-light field congruence test

Answer

The beam-light field congruence test verifies that the visible light field from the collimator accurately represents the x-ray field, ensuring proper collimation.

Question 5

The heel effect in radiography refers to:

Accepted Answer

Reduced x-ray intensity on the anode side of the beam compared to the cathode side

Answer

The heel effect occurs because x-rays produced at depth within the anode must travel through more anode material when exiting toward the anode side, reducing their intensity on that side.

Radiography Exam Practice Test

Radiography Exam Practice Test

Radiography Exam Radiographic Equipment and Maintenance