Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Patent
1998-10-14
2000-03-14
Baxter, Janet
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
430507, 430517, 430567, 430569, 430966, G03C 146
Patent
active
060371129
ABSTRACT:
A radiation-sensitive medical diagnostic film for soft tissue imaging, particularly mammography, is disclosed. The film allows more rapid processing than films currently available for mammographic imaging and maintains acceptably high levels of image sharpness and low levels of mottle. The radiographic film records medical diagnostic images of soft tissue through (a) exposure by a single intensifying screen located to receive an image bearing source of X-radiation and (b) processing, including development, fixing and drying, in 90 seconds or less comprised of a film support transparent to radiation emitted by the intensifying screen and having opposed front and back major faces and an image-forming portion for providing, when imagewise exposed by the intensifying screen and processed, an average contrast in the range of from 2.5 to 3.5, measured over a density above fog of from 0.25 to 2.0. The image-forming portion is comprised of (i) a processing solution permeable front layer unit coated on the front major face of the support capable of absorbing up to 70 percent of the exposing radiation and containing less than 40 mg/dm.sup.2 of hydrophilic colloid and less than 40 mg/dm.sup.2 silver in the form of radiation-sensitive silver halide grains, and (ii) a processing solution permeable back layer unit coated on the back major face of the support containing less than 40 mg/dm.sup.2 of hydrophilic colloid, silver in the form of radiation-sensitive silver halide grains accounting for from 20 to 45 percent of the total radiation-sensitive silver halide present in the film, and a dye capable of providing an optical density of at least 0.40 in the wavelength region of the exposing radiation intended to be recorded and an optical density of less than 0.1 in the visible spectrum at the conclusion of film processing. Tabular grains account for greater than 50 percent of total grain projected area in the back layer unit, and the back layer unit exhibits a speed that ranges from 0.3 log E to 1.0 log E slower than the front layer unit to facilitate (a) visualizing anatomical features in areas of high film exposure and (b) minimizing any adverse effect of the tabular grains on desirable cold overall image tone.
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Baxter Janet
Eastman Kodak Company
Thomas Carl O.
Walke Amanda C.
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