| 摘要 |
In the digital processing of radiographic images, interpretation of the image is aided by converting the pixels of an original radiographic image into electrical signals generally corresponding to the densities of the individual pixels and adjusting the electrical signals for the pixels constituting a diagnostically non-relevant image zone, selectively of the pixels constituting a diagnostically relevant image zone, as determined by observation of a visualization of the original radiographic images, e.g. by a radiologist viewing such image on the screen of a viewing monitor, to a density level such that when the electrical signals including the adjusted signals are visualized into an image for interpretation, the pixels of the diagnostically non-relevant zone are effectively masked out and light from the non-relevant zone is prevented from interfering with viewing of the relevant zone. Various predetermined configurations, e.g. a rectangle, circle or polygon, can be selected for the relevant zone for generation by identifying a few selected points on the original. image being viewed, e.g., opposite corner points for a rectangular, a center point and perimeter point for a circle, etc. The visualized image with the blanked out non-relevant regions can be recorded electronically as a soft copy or photographically as a hard copy on a photographic recording medium. Border regions around the image can be made of maximum density, e.g. black, while the density of the non-relevant zone is adjusted to a lesser but still masking density.
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