Those system parts may add disturbances to the calibration, i.e. the conditions must be held constant or the regions of interest used to generate a calibration table must be large enough to average the above mentioned distortion effects.
FilmQA pro correlates the data of the calibration table to a smooth monotonic (invertible) function. The functions offered in FilmQA Pro have only 3– 5 parameters, i.e. the calibration process requires only 2-4 exposed calibration patches + unexposed file to carry out a calibration.
To minimize the inter-scan related effects all calibration patches must be scanned together (ordinary calibration) and the application or patient film should be evaluated using reference patches (download protocol).
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