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Metal parts in a target object sometimes cause metal artifacts and beam hardening effects in an x-ray tomographic image. In this paper, we proposed a new method to extract a region of metals by finding a change of an energy spectrum in the projection data measured with an energy discriminating photon counting detector. The change in the energy spectrum was calculated using two parameters; RAI (relative...
The purpose of our research is to measure the amount of contrast agents used in x-ray CT accurately. The use of contrast agents such as gold nano-particles enables molecular imaging with the x-ray CT system. To realize an energy discriminating measurement, we have developed a photon counting detector with a CdTe semiconductor that is able to measure x-rays with the count rate of 107 cps/mm2 with four...
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