Types of Film

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In addition to screen-film, direct-exposure film, sometimes called nonscreen film and special application film (such as that used in mammography, video recording, duplication, subtraction, cineradiography, and dental radiology), is available. Each has particular characteristics that become more familiar to the radiologic technologist with use.


Screen-Film

As was previously stated, screen-film is the most widely used IR in radiology. Several characteristics must be considered when one is selecting screen-film: contrast, speed, spectral matching, anticrossover/antihalation dyes, and requirement for a safelight.

Table 11-1 Types of Film Used in Medical Imaging

Type
Emulsions
Characteristics
Applications
Intensifying screen
Two
Blue or green sensitive
General radiography
Laser printing
Single with antihalation backing
Matches laser used (about 630 nm)
Laser printers attached to CT, MRI, ultrasound, etc.
Copy or duplicating
Single with antihalation backing
Pre-exposed to Dmax
Duplicating radiographs
Dental
Two packed in sealed envelope
Has lead foil to reduce back scatter
Dentistry
Radiation monitoring
Two packed in sealed envelope
One emulsion can be sloughed off to increase OD scale
Radiation monitoring
Dry transfer
One
Thermally sensitive
“Dry” printers



Non- Screen Film

Non screen film also known as direct exposure film is film that does not require the application of intensifying screen. This is most commonly used in mammography.






















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