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Pronunciation: win'do


  1. Any opening in space or time, particularly a critical interval within which a given event must, or cannot, occur.
  2. computed tomography the range of CT numbers (in Hounsfield units) across which all shades of the gray scale are distributed in a given image so as to emphasize slight differences in x-ray absorption coefficients between tissues of similar density (mediastinal soft tissues).

Synonym(s): fenestra

See Also: CT number, window level, window width

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.