Cassette

Cassettes are rigid holders used in conventional and computed radiography (CR) for the screen film system and imaging plate respectively. 

The back side of the cassette has a rubber or felt for adequate contact between screen film system or with the imaging plate. The front is made of low atomic number material (e.g. plastic or carbon) and the back is made of high atomic number material (e.g. lead) to reduce back scatter.

In case of conventional radiography, two screens are mounted on each side of the cassette, except in mammography, where a single screen is mounted on the back side. These cassettes have to loaded with film in dark room unlike the cassettes used in CR which can be loaded with imaging plate in light.

No cassette is used in direct digital radiography.

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Article information

rID: 36740
Sections: Physics, Radiography
Synonyms or Alternate Spellings:
  • Cassette holder

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