reversal film

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reversal film

[rivur′səl]
(in radiology) a reverse-tone duplicate of an x-ray image, showing black changed to white and white to black. It is produced by exposing single-emulsion subtraction film through a standard x-ray film. Also called diapositive, positive mask.
References in periodicals archive ?
Digital slide viewers allow the pathologist to see a virtual slide on a screen in a similar fashion to a traditional microscope.
The technology available today makes the psychedelic light shows of the '60s look like, well, it's the difference between an old-fashioned stereo slide viewer and an IMAX theater.
For the studio portion of the lesson, I set up the artroom into four stations composed of magazines, prints, a portable slide viewer that enables close-ups of individual slides and books.
A-la-carte feature sets, such as the offline PowerPoint slide viewer and advertisement module, are available as add-ons.