Imaging system for medical diagnostic apparatus

摘要

The imaging system (8) represents medical images by means of a reproducing device (9). This has an image memory (10) for point-wise storage of image signals generated by the diagnostic apparatus (1-14). The system (8) also has a circuit (11) for transformation of Grey values of the image signals, to which the reproduction device (9) is connected. A selection circuit (12) is connected to the image memory (10), which generates Grey values within an evaluation window. A computing circuit (13) for determining the minimum and maximum values of the selected Grey value is connected to the selection circuit (12). A detector (14) for changing the max. and min. values is connected to the computing circuit (13). The detector output signal is fed to a threshold circuit (15) for determining the size of the change. The threshold circuit (15) is connected to the computing circuit (13) and a control device (16) for the selection circuit to control the size of the evaluation window. Below the threshold, the window is increased. Above the threshold the previous min. and max. values are fed as window limits to the circuit for transforming the Grey values.