| abstract |
For high-contrast visualization of small lesions or other target areas in tissue that contains at least one opacifying chemical element in the human body, an x-ray arrangement is described that comprises at least one x-ray radiation source that emits essentially polychromatic x-ray radiation, a first detector or several first detectors, with which values of a first intensity of the x-ray radiation that is transmitted through the object under examination can be determined, a second detector or several second detectors, with which values a second intensity of the x-ray radiation that is emitted from the object under examination can be determined, at least one correlation unit, with which the first intensity values of the transmitted x-ray radiation can be correlated with one another with the second intensity values of the emitted x-ray radiation, pixel for pixel, and at least one output unit for visualizing the object under examination from the pixel signals that can be obtained by correlation of the first intensity values with the second intensity values. The transmission and emission images are preferably recorded simultaneously. The process can also be combined with other radiological images, e.g., from the positron-emission tomography (PET) or single-photon-emission-computer tomography (SPECT). |