Radiography: Cassettes and Image Receptors
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Questions and Answers

What is the primary purpose of the intensifying screens in the cassette?

  • To protect the film from physical damage
  • To maintain the film in close contact with the intensifying screens
  • To absorb secondary radiation scattered back into the film
  • To convert X-ray photons into visible light (correct)

    • What is the composition of the back of the cassette?

  • A transparent material to allow X-ray penetration
  • A strong metal to absorb secondary radiation (correct)
  • A thin layer of intensifying screens
  • A light-tight material to exclude light

    • What is the result of the silver halide crystals interacting with light?

  • The surface of the crystal is turned into a metallic silver (correct)
  • The crystal is converted into intensifying screens
  • The crystal is protected from physical damage
  • The crystal is made transparent to X-rays

    • What is the purpose of the cassette's shallow container?

    <p>To contain the film and intensifying screens</p> Signup and view all the answers

    What is the effect of the intensifying screens on the patient's dose?

    <p>It decreases the patient's dose</p> Signup and view all the answers

    What is the purpose of the material on the front aspect of the cassette?

    <p>To be transparent to X-rays</p> Signup and view all the answers

    What is the function of the cassette?

    <p>To contain the film and exclude light</p> Signup and view all the answers

    What is the result of the X-ray photons interacting with the intensifying screens?

    <p>The conversion of X-ray photons into visible light</p> Signup and view all the answers

    What is the purpose of the silver halide crystals in the film?

    <p>To interact with light and produce an image</p> Signup and view all the answers

    What is the effect of the intensifying screens on the mAs required to produce a particular density?

    <p>It decreases the mAs required</p> Signup and view all the answers

    Study Notes

    X-ray Image Production

    • X-ray images are produced on an image receptor (film) enclosed in a light-tight cassette.

    Cassette Function and Composition

    • Cassettes are flat, light-tight containers that serve four purposes:
      • Containing the film
      • Excluding light
      • Maintaining the film in close, uniform contact with intensifying screens
      • Protecting the intensifying screens from physical damage
    • The front of the cassette is made of a material transparent to x-rays, while the back is constructed from a strong metal to absorb secondary radiation (back scatter).
    • Cassettes have a shallow container that holds thin intensifying screens and a film.

    Intensifying Screens

    • Intensifying screens convert X-ray photons into visible light, intensifying the effect of the X-ray photon and producing a larger number of light photons.
    • This process decreases the mAs required to produce a particular density, significantly reducing the patient's dose.

    Radiographic Film

    • Films are composed of, among other things, silver halide crystals, which are light-sensitive chemicals.
    • When exposed to light, the surface of the silver halide crystal is turned into metallic silver, forming the invisible image.

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    Description

    Learn about the role of cassettes in producing X-ray images, including their components, functions, and purposes. Understand how cassettes contain film, exclude light, and interact with ionizing radiation.

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