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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 develop a new pinhole SPECT system using a triple head gamma camera system. The proposed data acquisition geometry used multi-pinhole collimators attached to each gamma camera. Acquired data were reconstructed with the OS-EM method. We evaluated the feasibility of the system with simulations. In the simulations, we evaluated three types of the pinhole collimators...
The development of a pixilated semiconductor detector such as CdTe or CdZnTe, which is available for x-ray imaging, has been pursued by many researchers. In the case of x-ray imaging, the photon flux is very high, and thus conventional CT systems adopt energy integration detectors. On the other hand, the reduction of patient dose becomes one of the major issues in state-of-art CT systems. Thus, detectors...
The development of photon counting detectors enables us to decompose materials in x-ray CT images. The photon counting detection can measure a linear attenuation coefficient of a given energy range, thereby contributing to the material decomposition or identification. In this detection, measured photon counts were affected by statistical noise, making it difficult to obtain accurate measurements of...
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...
We have developed an electron-tracking Compton camera (ETCC) for new medical imaging device. Conventional gamma camera, PET and SPECT, have the problem of energy limitation. This problem is one of the major problems for this study. However, our ETCC has a wide energy dynamic range (200–1300 keV). Also ETCC have the wide field of view because ETCC does not need a collimator and does not need to catch...
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