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AssigneeGE Medical Systems SA
InventorsFrancois Nicolas, Jean Lienard, Serge Muller, Elisabeth Soubelet, Andreas Rick
Estimating the term…
Method and system for compensating for the thickness of an organ in a radiology instrument, in which an image of the radiological thicknesses of the organ through which the X-ray beam has passed is calculated on the basis of a digitized image, the thickness image is filtered using a low-pass filter in order to obtain a low-frequency image, the low-frequency image is subtracted from the radiological thickness image in order to obtain a contrast image, the low-frequency image is processed using a pre-recorded table taking into account a contract χ selected by a user in order to obtain an image with reduced dynamic range, and the image with reduced dynamic range is added to the contrast image in order to obtain a compensated thickness image, the pixels having a level below or above a predetermined threshold being returned at least to the value of the threshold, while preserving the differences and real ratios between the anatomical structures.
A method of compensation of thickness of an object in a radiological imaging apparatus having radiation source and a means of detection of the radiation source after it has crossed the object, the means of detection being capable of converting the radiation source into a digital electronic signal, in which, from a digitized image, an image of the radiological thicknesses of the object crossed by the radiation source is calculated, the image of radiological thicknesses is filtered by a low-pass filter in order to obtain a low-frequency image, the low-frequency image of radiological thicknesses is subtracted in order to obtain a contrast image, the low-frequency image is processed by a prerecorded table or calculated in real time taking into account a contrast χ chosen by a user in order to obtain an image with reduced dynamics and the image with reduced dynamics and the contrast image are added in order to obtain a compensated thickness image, the pixels of level lower or higher than a predetermined threshold having been brought back at least to the value of the threshold, while preserving the differences and the real relations between the internal structures of the object.
A system of compensation of thickness of an object in a radiological imaging apparatus, of the type comprising a radiation source and a means of detection of the radiation source after it has crossed the object, the means of detection being capable of converting the radiation source into a digital electronic signal, including a means for calculating, from a digitized image, an image of the radiological thicknesses of object crossed by the radiation source, low-pass filter for obtaining radiological thicknesses from the image, a low-frequency image, means for subtracting the low-frequency image from the radiological thicknesses in order to obtain a contrast image, means for processing the low-frequency image according to a prerecorded table taking into account a contrast χ chosen by a user in order to obtain an image with reduced dynamics and means for adding the image with reduced dynamics and the contrast image in order to obtain a compensated thickness image, the pixels of level lower or higher than a predetermined threshold having been brought back at least to the value of the threshold, while preserving the differences and the real relations between the features of the object.
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