学位論文

フォトンカウンティング形X線CTシステムを用いた媒質同定法の開発

Development of identification method of a media with a photon counting X-ray CT

jpn

2012-03-24

Not Applicable (or Unknown)

2012-03-24

修士(工学)

工学研究科情報電子工学専攻; 指導教授: 尾川浩一

Modern x-ray CT systems measure data corresponding to the sum of the energy of x-ray photons incident to a detector. Thus reconstructed values are a kind of average of linear attenuation coefficients over the whole energy range. So it is hard to measure the true linear attenuation coefficient of a target medium, because a linear attenuation coefficient of a medium is a function of x-ray energies [1]. However, if we could measure an energy spectrum of detected photons with several energy windows with an x-ray CT system, we would be able to identify a medium with its linear attenuation coefficient in a region of interest. The identification of a medium with an x-ray CT would enable us to evaluate the degree of calcification in a vein, and to improve the accuracy of treatment planning in a heavy ion therapy. The aim of this study is to accurately a medium with an x-ray CT system, in which data are measured with several energy windows. In this paper, We showed the validity of our identification method of a medium with a photon counting x-ray CT system.

Thesis