Method for the correction of the measurements of optical density made on a radiographic film
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United States of America Patent
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Mar 22, 1994
Grant Date -
N/A
app pub date -
Aug 22, 1991
filing date -
Aug 31, 1990
priority date (Note) -
Expired
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Abstract
To carry out an automatic processing operation on radiographic images in mammography, it is shown that it is possible to correct the harmful effects of the linearity defect of the characteristic curve of sensitivity of the radiographic film used for this radiograph by making a statistical study of the noise in this image. It is shown that this statistical study enables the correction elements to be deduced directly using a top hat transformation. The processing is then independent of any prior knowledge that might be had of the sensitivity of the film or of the conditions in which the examined radiographs were acquired as well as subsequently developed.
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