- Any opening in space or time, particularly a critical interval within which a given event must, or cannot, occur.
- 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).
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Examples: glitazone, GI cocktail, etc.