Anode Assembly Quiz

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Questions and Answers

What is the diameter range of the anode disk in the anode assembly?

  • 3-5 cm
  • 5-8 cm
  • 10-12 cm
  • 7-10 cm or more (correct)

Which material is used for the stem in the anode assembly?

  • Aluminum
  • Copper
  • Molybdenum (correct)
  • Steel

What is the purpose of the blackened copper rotor in the anode assembly?

  • To cool the anode disk
  • To rotate the target stem (correct)
  • To insulate electrical components
  • To support the anode disk

What component is the anode disk part of in the anode assembly?

<p>Induction motor (C)</p> Signup and view all the answers

In the anode assembly, how is the rotor described?

<p>A blackened copper rotor (A)</p> Signup and view all the answers

What factor primarily affects the maximum kV rating in a system?

<p>The insulation of the tube and cables (B)</p> Signup and view all the answers

What happens to the allowable mA rating as the kV increases?

<p>It decreases due to the space charge effect (A)</p> Signup and view all the answers

Why is the allowable mA low at high kV?

<p>The space charge effect limits current flow (C)</p> Signup and view all the answers

In which scenario would the maximum mA be lower?

<p>At high kV settings (A)</p> Signup and view all the answers

What aspect of a system can reduce maximum kV ratings?

<p>Improper tube insulation (D)</p> Signup and view all the answers

What is the position of the diaphragm in relation to the source and detector?

<p>Halfway between the source and detector (C)</p> Signup and view all the answers

Where are the sheets of absorbing material located in relation to the source and detector?

<p>Halfway between the source and detector (D)</p> Signup and view all the answers

What additional component may be added in front of the detector?

<p>A second collimator (D)</p> Signup and view all the answers

What role does the diaphragm play in the system described?

<p>It regulates the intensity of the source. (D)</p> Signup and view all the answers

Which of the following statements is true regarding the layout of the components?

<p>Both the diaphragm and sheets of absorbing material are equidistant from the source and detector. (D)</p> Signup and view all the answers

What is another name for unmodified scatter?

<p>Thomson scattering (C)</p> Signup and view all the answers

In unmodified scatter, how does the photon interact with the electron?

<p>The photon is scattered without energy loss. (B)</p> Signup and view all the answers

Which of the following best describes the energy behavior of a photon during unmodified scatter?

<p>The photon maintains its energy during scattering. (B)</p> Signup and view all the answers

What type of scattering occurs when a photon bounces off an electron that is firmly bound to its parent atom?

<p>Unmodified scatter (A)</p> Signup and view all the answers

Which of the following is NOT a term associated with unmodified scatter?

<p>Compton scattering (B)</p> Signup and view all the answers

What happens to the energy carried off by the recoil electron?

<p>It is absorbed by the material. (C)</p> Signup and view all the answers

What is the fate of the remainder of the energy after the recoil electron takes its share?

<p>It is carried by the photon and considered scattered. (A)</p> Signup and view all the answers

How is the energy carried by the photon characterized after interaction with the recoil electron?

<p>It is considered scattered. (D)</p> Signup and view all the answers

Which of the following statements is true regarding the interaction of photons and recoil electrons?

<p>The recoil electron absorbs energy while the remaining energy is handled by the photon. (D)</p> Signup and view all the answers

What is the primary outcome of a collision between a photon and a material leading to recoil electrons?

<p>Absorption of energy by the recoil electron and scattering of the remainder. (C)</p> Signup and view all the answers

What happens to the spectrum of X-rays when they pass through increasing thicknesses of aluminum?

<p>The intensity of X-rays decreases. (D)</p> Signup and view all the answers

What is the voltage mentioned in the context of the X-ray generation spectrum?

<p>60 kV (B)</p> Signup and view all the answers

How does increasing the aluminum thickness affect the low-energy X-rays?

<p>Low-energy X-rays are absorbed more effectively. (D)</p> Signup and view all the answers

What is the purpose of filtration in the context of X-ray generation?

<p>To reduce patient exposure to unnecessary radiation. (D)</p> Signup and view all the answers

If the aluminum thickness is increased from 1 mm to 3 mm, what is the anticipated effect on the high-energy X-ray photons?

<p>There will be no significant change. (A)</p> Signup and view all the answers

Flashcards

Anode disk diameter

A circle-shaped component of the anode assembly, ranging from 7-10 cm or more in diameter.

Molybdenum stem material

A thin metal rod part of the anode assembly made of molybdenum.

Copper rotor function

Part of the induction motor and responsible for rotating the target stem.

Anode disk shape

A disc-shaped component of the anode assembly

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Blackened copper rotor

A component of an induction motor that rotates a target stem, likely blackened for efficiency.

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Maximum kV

The highest voltage a x-ray tube can safely operate at, limited by the insulation of the components.

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Space charge effect

The phenomenon where a cloud of electrons accumulates near the cathode, limiting the maximum current (mA) at low kV.

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Low kV, low mA

At low kilovoltage, the maximum allowable milliamperage (mA) is also low due to the space charge effect.

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High kV, low mA

At high kilovoltage, the maximum allowable milliamperage (mA) is lower than at low kV due to the space charge effect and the tube's ability to withstand higher voltage.

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Tube rating

The maximum allowable mA that a tube can handle, which is lower at higher kV.

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Diaphragm's Role

The diaphragm helps control the beam's shape and reduce scatter radiation by limiting the area exposed to X-rays.

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Absorbing Material

The sheets of absorbing material help reduce scatter radiation by absorbing unwanted X-rays.

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Positioning of Diaphragm and Material

The diaphragm and absorbing material are strategically placed halfway between the X-ray source and the detector to effectively minimize scatter radiation.

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Second Collimator

A second collimator is sometimes used in front of the detector to further reduce scatter radiation.

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Scatter Radiation

Scatter radiation is unwanted X-rays that have changed direction after interacting with the patient's body.

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Photodisintegration

A process where a high-energy photon interacts with an atom's nucleus, causing it to break apart into smaller parts.

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Unmodified scatter

A type of photon interaction with matter where the photon changes direction but does not lose any energy.

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Coherent scattering

Another name for unmodified scatter, where the photon interacts with an electron but doesn't lose energy.

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Classical scattering

A synonym for unmodified scatter, describing the interaction of a photon with an electron using classical physics.

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Elastic scattering

Another term for unmodified scatter, emphasizing that the photon's energy remains unchanged.

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Recoil electron

An electron that absorbs some energy from an incoming photon during Compton scattering.

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Compton scattering

A process where a photon interacts with an electron, transferring some of its energy to the electron and changing direction.

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Scattered photon

The photon that continues traveling after Compton scattering, but with less energy than before the interaction.

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Energy absorbed by material

The energy lost by the photon during Compton scattering is absorbed by the material where the scattering occurs.

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How is energy carried off in Compton scattering?

During Compton scattering, the incoming photon's energy is divided between the recoil electron and the scattered photon.

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X-ray Spectrum

The range of energies of X-rays produced by an X-ray tube, visualized as a graph with energy on the x-axis and intensity on the y-axis.

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Filtration Effect

The process of removing low-energy X-rays from the beam using materials like aluminum, which results in a higher average energy for the remaining X-rays.

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Aluminum Filtration

Using aluminum sheets to absorb low-energy X-rays, increasing the energy of the X-ray beam.

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Increased Filtration

Adding more layers of aluminum to the filter increases the average energy of the X-ray beam and reduces the dose to the patient.

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Beam Hardening

The process of increasing the average energy of the X-ray beam through filtration, making it more penetrating.

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Study Notes

General Information

  • This document is a textbook on medical imaging physics.
  • It covers the physics of radiation, radiation protection, various imaging modalities, and associated equipment.
  • The textbook is written by Penelope Allisy-Roberts and Jerry Williams.
  • The book is in its second edition, published in 2008.

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