E.i. Dupont De Nemours and Company

Daniel J Mickewich

Jacob Beutel

Sandra Laurine Issler

Daniel Frederick Juers

Bernard Allan Apple

John R Shock

Earle L Kitts, Jr

Richard G Stafford

Eugene F Haugh

Bob E McConnell

Douglas L Wilhite

Raymond J Russell

A pair of intensifying screens for use in high resolution radiography comprises a front screen comprising a phosphor with a density of no more than 5.5 g/cm.sup.3 and a back screen comprising a phosphor with a density of at least 6.0 g/cm.sup.3.

Radiological system employing phosphors of different densities

A method for computer-aided detection of anomalies in an image comprise the steps of: (1) dividing the image into a plurality of m.times.n regions; (2) subtracting the background from each of the regions; (3) for each of the regions, selecting a smaller p.times.q subregion; (4) normalizing the p.times.q subregion; (5) feeding the p.times.q subregions into a neural network system, the neural network system having plural member neural networks, each trained to recognize a particular preselected anomaly type; (6) comparing each output value of the plurality of member neural networks to a first threshold; (7) selecting a maximum value from the output values which are greater than the first threshold; (8) comparing the maximum value to a second threshold above which the presence of an anomaly is indicated, and storing the result; (9) clustering a plurality of the stored results to form clusters; and (10) marking the location of the clusters.

Application of neural networks as an aid in medical diagnosis and

A wide latitude, high resolution radiographic system having a relative speed of at least 150 and a contrast transfer function of at least 0.30 when measured at 6 line pairs per millimeter, comprises at least one X-ray intensifying screen in operative association with a photosensitive silver halide element having a maximum contrast of less than or equal to 3.0 produces superior images, particularly chest images over a wide range of exposures, without the decrease in image quality or contrast normally seen in wide latitude systems.

Radiographic system with improved image quality

Silver halide emulsions with a narrow and uniform particle size distribution are made by introducing monodisperse seed crystals into a gelatin-salts mixture, followed by splash-preparation procedures to make the final emulsion.

Splash-prepared silver halide emulsions with a uniform particle size

Novel silver halide crystals useful for both negative and positive photographic elements are produced by balanced double jet precipitation. Using that process, silver halide adds preferentially to the (111) surfaces of tetradecahedral silver bromide or iodobromide crystals to form cubic crystals which have corners containing a different silver halide from that in the lateral surfaces. In a specific embodiment, a crystal has corners composed of silver bromochloride, while the crystal substrate consists of highly photosensitive silver iodobromide.

Silver halide crystals with two surface types

High contrast photographic images suitable for lithographic use are obtained with stable (nonlithographic) developers when iodide is released from a surface-sensitized iodobromide emulsion to induce development of the exposed areas in an internally sensitized core-shell emulsion. A bromoiodide or trihalide core is produced by balanced double jet precipitation, then the core is chemically sensitized and covered with a chlorobromide or chloride shell by balanced double jet precipitation or preferably by a cyclic pAg addition technique. The core-shell emulsion must have a sensitivity equal to or greater than the surface sensitized emulsion.

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Wilmington, DE, United States of America

Daniel J Mickewich