X-Ray Tube Components and Operation Quiz

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What happens when a photon with energy exceeding 1.02 MeV interacts with the electric field of the nucleus?

It is totally absorbed and excites the nucleus

It has no relevance to diagnostic imaging

It imparts any excess energy to the electrons as kinetic energy (correct)

It splits into an electron-positron pair

At what energy level does photodisintegration of the nucleus occur?

At 5 MeV

Below 1.02 MeV

Above 10 MeV (correct)

At 1.02 MeV

What is the relationship between contrast and dose in diagnostic imaging?

Contrast increases as kVp decreases

Dose decreases as kVp decreases

Dose increases as kVp decreases (correct)

There is no compromise between contrast and dose

What is the process by which electrons are boiled off at the cathode?

Electron emission Signup and view all the answers

What is the typical size of the bombarded spot on the anode in x-ray production?

1mm^2 Signup and view all the answers

What is the function of the induction motor of the anode in x-ray tube operations?

To rotate the anode disk to provide a larger total area for bombardment Signup and view all the answers

What is the main factor for controlling the average energy of the x-ray beam?

kVp Signup and view all the answers

What does the mA setting control in x-ray tube operations?

The quantity of current flow from cathode to anode per unit time Signup and view all the answers

What is the typical range for the anode angle in diagnostic x-ray tubes?

7-20 degrees Signup and view all the answers

What is the function of the AEC (automatic exposure control) in x-ray tube operations?

To stop the exposure as soon as a predetermined quantity of remnant beam has reached the image receptor Signup and view all the answers

What is the conventional unit for the quantity of electrical charge liberated by ionizing electromagnetic energy per unit mass of air?

Roentgen Signup and view all the answers

What is the main factor for controlling the total quantity of radiation produced during an exposure?

mAs setting Signup and view all the answers

What is the process by which electrons are accepted by the anode in x-ray tube operations?

Electron absorption Signup and view all the answers

What is the typical speed of rotation for the induction motor in x-ray tube operations?

3000 rotations/min Signup and view all the answers

What does the effective focal spot (EFS) represent in x-ray tube operations?

The length and width of the focal spot as projected down by the central ray in the x-ray field Signup and view all the answers

What is the material of the envelope of the x-ray tube?

Pyrex glass or metal Signup and view all the answers

What is the filament made of in the x-ray tube?

Thoriated tungsten Signup and view all the answers

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

To shape the electron beam Signup and view all the answers

What is the material of the target in the x-ray tube for x-ray production?

Tungsten 74 and rhenium Signup and view all the answers

What is the material of the stationary anode in the x-ray tube?

Tungsten in a copper block Signup and view all the answers

What is the purpose of the rotating anode disc in the x-ray tube?

Increases heat loading ability Signup and view all the answers

What is the material of the anode stem in the x-ray tube?

Molybdenum Signup and view all the answers

What is the material of the rotor in the x-ray tube?

Copper and iron Signup and view all the answers

What is the material of the stator in the x-ray tube?

Electromagnets Signup and view all the answers

What does the Automatic Exposure Control (AEC) measure in the x-ray tube?

Certain parts of the remnant beam Signup and view all the answers

What are some types of radiation production discussed in the text?

Characteristic radiation, bremsstrahlung production, and the emission spectrum Signup and view all the answers

What interactions are focused on in the text?

Coherent, Thompson and Rayleigh scattering, Compton scattering, and the photoelectric effect Signup and view all the answers

Study Notes

X-ray Tube Components and Operation

The x-ray tube has an envelope made of pyrex glass or metal to maintain vacuum and withstand high heat levels.
The filament, made of thoriated tungsten, is part of the cathode and produces electrons via thermionic emission.
The focusing cup, made of metal, surrounds the filament and shapes the electron beam to keep electrons together.
The target, made of tungsten 74 and rhenium in most modalities, is struck by the electron beam for x-ray production.
The stationary anode, made of tungsten in a copper block, is suitable for low volume environments and conducts heat away from the tungsten target.
The rotating anode disc, made of tungsten and sometimes layered with graphite, increases heat loading ability.
The anode stem, made of molybdenum, connects the anode disc to the rotor assembly in rotating designs.
The rotor, made of copper and iron, rotates the anode disc as part of the induction motor inside the tube.
The stator, made of electromagnets, powers the induction motor outside the tube around the rotor.
The Automatic Exposure Control (AEC) measures certain parts of the remnant beam and allows technologists to select ionization chambers and energy levels.
Different types of radiation production including characteristic radiation, bremsstrahlung production, and the emission spectrum are discussed.
The text also covers contrast, scatter radiation, grid construction parameters, and attenuation, with a focus on interactions like coherent, Thompson and Rayleigh scattering, Compton scattering, and the photoelectric effect.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge of x-ray tube components and operation with this quiz. Explore topics such as filament, focusing cup, target, anode, rotor, AEC, radiation production, and scatter radiation. Perfect for radiology students and professionals looking to brush up on their understanding of x-ray technology.