An improved approach to the current fixed sampling area design of automatic brightness control (ABC) systems installed in most fluoroscopy units is described. Using a binary image to define the sampling and non-sampling areas, the digital image data and statistical information within the sampling area of the image can be extracted in real time for feedback control of the ABC system. The operator can select the binary image so the sampling area in that binary image matches the feature of interest wherever it is in the field of view. This design allows greater control and flexibility in the selection of sampling area for ABC systems in digital fluoroscopy, and therefore overcomes the problems inherent in current fixed sampling area systems. It is applicable to current image intensifiers and new flat panel detectors.
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