Title: Method and apparatus producing plural images of different contrast range by X-ray scanning

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Abstract: A plurality of radiographic images of a subject are obtained simultaneously by situating the subject between a scanning x-ray source and an x-ray detector. The source has an electron beam which is swept through a raster pattern on a broad target to produce a moving x-ray origin point while the detector has an effective radiation sensitive area which is very small in relation to the raster pattern. The X-axis and Y-axis beam deflection signals which control the x-ray source are also transmitted to each of a plurality of x-y display oscilloscopes causing each oscilloscope to exhibit a raster pattern similar to that of the x-ray source. The light intensity control of each oscilloscope receives processed x-ray count signals from the detector so that a radiographic image of the scanned region of the subject is generated at the screen of each oscilloscope. Separate signal processing circuits having different gain factors and establishing different base levels and peak levels for intensity signals are coupled between each oscilloscope and the x-ray detector enabling each radiograhic image to emphasize a different aspect of the scanned region of the subject as each image may have a different contrast range. The plural images taken in conjunction exhibit contrast ranges which may exceed the contrast limitations of a single oscilloscope or the similar limitations of photographic film which may be used to record the oscilloscope display.


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