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Report No.
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Beam hardening free CT measurement method, 3; Feasibility study on current mode detector

Kanno, Ikuo*; Uesaka, Akio*; Otaka, Masahiko; Hashimoto, Makoto  ; Ara, Kuniaki ; Nomiya, Seiichiro*; Onabe, Hideaki*

The beam hardening free CT imaging, which is not effected with the size of speciman, was obtained with the energy and the energy differential of X-rays. However, measurement of X-ray energy in high density as in CT is hard. To solve this problem, current mode X-ray detector (CMD) was designed. CMD is configured with several detective elements aligned with X-ray fluence, and read the current from each detective element. Relatively low energy photon is mainly absorbed in front detective elements of CMD and high energy photon can reach to deep, rough X-ray spectrum can be expected with current from each element. The ability of CMD is examined by simulation. Current from each element with particular X-ray field was calculated. To evaluate the X-ray spectrum expectation from current readout are evaluated with two ways, one is using response matrix solution, and the other is unfolding with SAND-II. It looks represent the iodine effective thickness.

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