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

What is the function of the cassette?

<p>To contain the film and exclude light (A)</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 (C)</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 (A)</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 (B)</p> Signup and view all the answers

Flashcards

Intensifying Screen's Purpose

X-ray photons are transformed into visible light, making the image brighter and requiring less radiation for the patient.

Cassette Back Composition

A strong metal plate absorbs the secondary radiation, reducing scatter and improving image quality.

Silver Halide Crystal Interaction

When light interacts with silver halide crystals, they transform into metallic silver, forming the image.

Cassette's Container Purpose

The cassette's shallow container holds the film and intensifying screens in close contact, ensuring proper image formation.

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Intensifying Screens & Patient Dose

Intensifying screens decrease the radiation dose required to create a visible image.

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Cassette Front Material

The front aspect of the cassette is transparent to X-rays, allowing them to reach the film and intensifying screens.

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Cassette Function

The cassette protects the film from light and ensures proper image formation.

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X-ray Photon Interaction with Screens

When X-ray photons hit the intensifying screen, they are converted into visible light, which exposes the film.

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Silver Halide Crystal Purpose

Silver halide crystals are sensitive to light and change when exposed, producing the image on the film.

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Intensifying Screens & mAs

Intensifying screens allow for less exposure time (mAs) to create the same image density.

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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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