1. A method for correcting image data of an examination object, which comprises a first image data record obtained using a first X-ray energy and a second image data record obtained using a second X-ray energy, the method comprising: generating a corrected image data record by subtracting from image point values at certain image point positions of the first image data record, image point values assigned to the corresponding image point positions in the second image data record, multiplied by a weighting factor, the weighting factor being selected as a function of the first X-ray energy used and the second X-ray energy used so that upon the subtraction, a calcium component is removed from the image point values; and generating a combination image data record from the first image data record and the second image data record wherein, to generate the corrected image, image point values of the second image data record multiplied by a weighting factor are only subtracted from the image point values of the first image data record at the image point positions where image point values of the combination image data record are relatively greater than a limit value, wherein before the corrected image data record is generated, at least one of (i) the image point values of the first image data record are each displaced by a first correction value and (ii) the image point values of the second image data record are each displaced by a second correction value, and at least one of (i) the first correction value corresponds roughly to a mean image point value of a base material in the first image data record, and (ii) the second correction value corresponds roughly to a mean image point value of the base material in the second image data record.