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U.S. Department of Health and Human Services

Radiation-Emitting Products

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Film Masking Devices

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900.12(b)(15): Facilities shall ensure that film masking devices that can limit the illuminated area to a region equal to or smaller than the exposed portion of the film are available to all interpreting physicians interpreting for the facility.


  1. Are there any specific requirements concerning the viewing conditions for screen-film mammograms?
  2. Are there any regulations regarding viewbox luminance?
  3. Our mammography exams are interpreted off-site. Do we need to have a viewbox, hot light, and masking materials on-site?
  4. Do masking view-scopes meet the masking requirement, even if their field of view is smaller than that of the size of the film?

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