| 摘要 |
A method for reconstructing two and three dimensional images of objects using X-ray image projections and iterative reconstruction techniques is provided. More specifically, the method provides an image of the object to be corrected. Two or more X-ray absorbance profiles of the image are obtained along two or more different projection directions. These profiles are compared with the corresponding absorbance profiles of the object substantially filled with an X-ray contrast agent and, based on this comparison, the image is corrected using the iterative reconstruction techniques. Before each iteration the pixels of the image are updated so that if the absorbance value of the pixel is below a preselected value then the pixel is set to 0, otherwise the pixel is set to the absorbance value corresponding to the concentration of the X-ray contrast agent within the object. The iteration stops when the difference between the absorbance profiles of the image and the object falls below a preselected value.
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