X-ray image correction apparatus
First Claim
Patent Images
1. An X-ray image-correction apparatus comprising:
- first memory means for storing a first X-ray image signal corresponding to a first X-ray image of a subject;
second memory means for storing a second X-ray image signal corresponding to a second X-ray image taken later than said first X-ray image;
address means for outputting address signals used for reading out image signals from said first and second memory means;
subtraction means for performing subtraction processing between the first and second X-ray image signals read out from said first and second memory means;
interest area specifying means for specifying at least one interest area in the X-ray image corresponding to the subtraction-processed image signals;
calculating means for calculating a position correction value for each of a plurality of sections obtained by dividing the interest area, to obtain a plurality of position correction values corresponding to a plurality of sections;
selecting means for selecting at least the position correction value appearing most frequently among the position correction values; and
correcting means for determining the actual correction value from at least the selected position correction value and controlling said address means to correct the address signals designating said first and second memory means by the actual correction value
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Abstract
An X-ray image correction apparatus has a subtraction processing circuit for subtracting image signals read out from the memories which store X-ray image signals corresponding to X-ray images taken before and after the injection of a contrast medium. An interest area is specified in the part which does not vary readily from the injection of the medium and this interest area is divided into a plurality of sections for each of which a position correction valve is calculated by a position correction valve calculator. The most common correction value of all the sections is used to correct misalignment between the before- and after-injection images.
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9 Claims
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1. An X-ray image-correction apparatus comprising:
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first memory means for storing a first X-ray image signal corresponding to a first X-ray image of a subject; second memory means for storing a second X-ray image signal corresponding to a second X-ray image taken later than said first X-ray image; address means for outputting address signals used for reading out image signals from said first and second memory means; subtraction means for performing subtraction processing between the first and second X-ray image signals read out from said first and second memory means; interest area specifying means for specifying at least one interest area in the X-ray image corresponding to the subtraction-processed image signals; calculating means for calculating a position correction value for each of a plurality of sections obtained by dividing the interest area, to obtain a plurality of position correction values corresponding to a plurality of sections; selecting means for selecting at least the position correction value appearing most frequently among the position correction values; and correcting means for determining the actual correction value from at least the selected position correction value and controlling said address means to correct the address signals designating said first and second memory means by the actual correction value - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification