E.i. Dupont De Nemours and Company

Jacob Beutel

Daniel J Mickewich

William K Smothers

Dalen E Keys

Albert F Harrington

Scott R Schicker

Lothar H Brixner

Raymond J LeStrange

Sandra Laurine Issler

Bernard Allan Apple

Dillon F Scofield

Richard G Stafford

Dillion F Scofield

Bob E McConnell

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

An improved X-ray intensifying screen comprising phosphor crystals having an effective amount of a light scattering particulate material, e.g., barium sulfate, strontium sulfate, calcium sulfate, titanium dioxide or magnesium oxide, adhered thereto is described. This screen will give high speed and yield an image with increased sharpness when exposed with a single-side coated medical X-ray film element, compared to one made without the particulate material.

X-ray intensifying screens with improved sharpness

Optical Combiners are provided for use in Head-Up Displays. The Combiners have a refractive index modulation greater than approximately 0.001.

Holographic optical combiners for head-up displays

Improved holographic optical elements are disclosed that contain a reflection hologram. Also, an improved process for forming reflection hologram.

Holographic optical elements having a reflection hologram formed in a

From the complex reaction mixture of cysteine and glutaraldehyde a low molecular weight polymer is recovered for use as an additive to silver halide emulsions and developers to increase speed. Iron and nickel complexes of the purified low molecular weight polymer are similarly useful for silver halide emulsions.

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Hockessin, DE, United States of America

Jacob Beutel