Preview of the general laboratory seminar “Development of the multi-energy X-ray tomography method using detectors based on microchips of the Medipix family” by Danila Kozhevnikov, 29.01.2019
A method for reconstruction of multi-energy X-ray tomographic images based on pre-segmentation and decomposition into basic substances was presented. It was shown that combination of a few detectors with sensors made of semiconductors with different atomic numbers considerably improves quality of energy measurements. A method for adjusting energy thresholds of detector pixels with simultaneous energy calibration with respect to the edge of the X-ray tube radiation spectrum and a procedure for mechanical adjustment of the MARS microtomograph were developed. A mathematical model of the detector was constructed, and its predictions were compared with the experimental data. Results of microtomographic investigations of biological (atherosclerotic patch, abdominal aortic aneurysm) and geological samples were reported.