Method and system of saturation management of radiographic image
AssigneeGE Medical Systems SA
InventorClaire Laurent
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Abstract
Method of saturation management of a digital radiographic exposure image in which there are one or more saturation areas, acquired notably after a mammogram on an acquisition chain in automatic mode using a low-dose preexposure image. A mask is made from the exposure image by taking the saturation areas into account; the coverage areas corresponding to the saturation areas of the exposure image are determined on the preexposure image by using the the mask; a digital standardization processing of the gray levels of both the exposure image and the preexposure image is then carried out; and the final image is determined from a combination of the two images thus processed.
Claims36
A method of saturation management of a final radiographic exposure image of an object in which there are one or more saturation areas comprising the steps of:
- acquiring a first image in an acquisition chain using a low-dose preexposure of the object;
- acquiring a second image using normal-dose exposure of the object;
- a mask is made from the second image by taking into account the saturation areas;
- and
- determining the final image by applying the mask to the first image.
A system of saturation management of a radiographic exposure image, comprising:
- an acquisition chain capable of elaborating, in addition to the exposure image containing a saturation area, a second preexposure image of weaker gray level;
- an image processing system containing:
- a means of detection of the pixels of the saturated area of the exposure image in order to form a mask;
- a means of detection of a coverage area on the second image, the coordinates of whose pixels correspond to the coordinates of the pixels of the saturated area of the exposure image;
- a means of enhancement of the gray levels of the coverage area to the same gray level as the unsaturated area of the exposure image;
- a means of addition of the enhanced coverage area of the second image with the unsaturated area of the exposure image in order to obtain the unsaturated final image;
- and
- at least one system of display of the final image.
A method of saturation management of a radiographic image of an object comprising:
- acquiring an image of the object exposed to a low-dose radiation;
- acquiring an image of the object exposed to a normal-dose radiation having at least one saturation area;
- determining a mask from the normal-dose image by taking into the saturation areas into account;
- and
- forming a final image by applying the mask to the low-dose image.
A system for saturation management of a radiographic image of an object comprising:
- means for acquiring a low-dose image of the object;
- means for acquiring a normal-dose image of the object having at least one saturation area;
- means for forming a mask from the normal-dose image by taking the saturation areas into account;
- and
- means for forming a final image by applying the mask to the low-dose image.
A method of saturation management of a radiographic exposure image in which there are one or more saturation areas comprising the steps of:
- acquiring the image after a mammogram on an acquisition chain in automatic mode using a low-dose preexposure;
- a mask is made from the exposure image by taking the saturation areas into account;
- determining the coverage areas corresponding to the saturation areas of the exposure image on the preexposure image by using the mask and the area complementing the junction of the coverage areas set at a zero gray level;
- carrying out a digital standardization processing of certain gray levels of both the exposure image and the preexposure image wherein the digital standardization processing is carried out by enhancing the gray level of the coverage areas on the preexposure image to the same gray level as the unsaturated areas of the exposure image;
- and
- determining the final image from a combination of the two images thus processed.
Dependencies are inferred from the claim text.