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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 this study is to remove the cervical vertebrae from a dental panoramic x-ray image with a tomosynthesis method. The elimination of the cervical vertebrae is based on the concept of the tomosynthesis method. We first measured the shift-amount that was required to reconstruct a panoramic x-ray image of the dental arch with a calibration phantom. Then, we made the shift-amount that was...
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 aim of this study is to develop an energy-binned photon-counting (EBPC) detector that enables us to provide energy information of x-rays with a reasonable count statistics. We used Al-pixel/CdTe/Pt semiconductor detectors, which had an active area of 8mm×144mm and consisted of 18 modules aligned linearly. The size of a CdTe detector module was 8mm×8mm and the thickness of the CdTe crystal was...
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