10 Questions
What is the primary purpose of the intensifying screens in the cassette?
To convert X-ray photons into visible light
What is the composition of the back of the cassette?
A strong metal to absorb secondary radiation
What is the result of the silver halide crystals interacting with light?
The surface of the crystal is turned into a metallic silver
What is the purpose of the cassette's shallow container?
To contain the film and intensifying screens
What is the effect of the intensifying screens on the patient's dose?
It decreases the patient's dose
What is the purpose of the material on the front aspect of the cassette?
To be transparent to X-rays
What is the function of the cassette?
To contain the film and exclude light
What is the result of the X-ray photons interacting with the intensifying screens?
The conversion of X-ray photons into visible light
What is the purpose of the silver halide crystals in the film?
To interact with light and produce an image
What is the effect of the intensifying screens on the mAs required to produce a particular density?
It decreases the mAs required
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.
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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