Direct Radiography Corp.

Eric L Gingold

Gregory F Powell

Jeffrey H Bell

James K Merello

A method for generating on demand a gray scale transfer curve for use in displaying an image comprised of a plurality of digital values representing pixel gray scale levels with a desired contrast and brightness. This is achieved by using a single sigmoid shaped function Y&equals;f(X, a, b, c) resembling an H&D curve of a photographic film. The Y axis represents digital output values to be used in displaying an image, while the X axis represents input digital values representing captured image information. &ldquo;a&rdquo; is a number representing boundary conditions for X and Y, &ldquo;b&rdquo; is a first parameter controlling the location of the curve along the X axis and &ldquo;c&rdquo; is a second parameter controlling the slope of the curve slope. This function is used to derive a Look-Up-Table (LUT) representing a continuous GST curve having the desired contrast and brightness.

Method for generating gray scale transfer functions for use in displaying a digital radiogram

A method for optimizing the radiogram image of a subject is provided. The method provides for showing the location of automatic exposure control sensors on the radiograms, along with alignment and targeting projections to optimize the radiation exposure of the subject. By displaying the location of the automatic exposure control sensors on the radiograms along with the image of the subject, the observers can determine whether the radiogram image was taken with appropriate subject alignment. This method also serves as an educational aid in training radiography technicians.

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Bala Cynwyd, PA, United States of America

Eric L Gingold