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 backscatter.
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 the darkroom unlike the cassettes used in CR which can be loaded with imaging plate in the light.
No cassette is used in digital radiography.
- 1. Curry TS, Dowdey JE, Murry RE. Christensen ́s physics of diagnostic radiology 4 Ed. Lippincott Williams & Wilkins. (1990) ISBN:0812113101. Read it at Google Books - Find it at Amazon
- 2. Direct vs. Indirect Conversion for Digital Radiography----Digital Radiography,DR,CR,digital X-ray, radiographic image. (n.d.). Retrieved June 11, 2018, from http://www.nova-medical.com/tec-0608.htm
Physics and imaging technology: x-ray
- x-ray production
- x-ray tubes
- tube rating
- interaction with matter
- beam collimators
- air gap technique
- intensifying screen
- x-ray film
- image intensifier
- digital radiography
- digital image
- x-ray artifacts
- radiation units
- radiation safety
- as low as reasonably achievable (ALARA)
- radiation protection
- background radiation
- background radiation equivalent time
- deterministic effect
- dose limits
- inverse square law
- lead apron
- radiation damage (biomolecular)
- radiation damage (skin injury)
- stochastic effect
- radiation detectors