学位論文

フォトンカウンティングX線CTを用いた媒質同定に関する研究

Identification of media with a photon counting X-ray CT

jpn

2010-03-24

Not Applicable (or Unknown)

2010-03-24

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 the energy of all incident photons that enter the detector, thus it is very difficult to identify a medium with an x-ray CT image. We proposed a new method to accomplish this task of identifying a medium, in which we used a detector that could measure photons using several energy windows. Our method identifies an object using a set of linear attenuation coeffcients of the object acquired from reconstructed images obtained for each energy window. For this identification, we calculated a set of linear attenuation coeffcients for each individual medium beforehand, and we compared this master dataset with that measured using the photon counting x-ray CT. To evaluate the validity of our proposed method, We conducted some simulations and experiments using several materials that are typical for these types of experiments. Our results showed that we could correctly identify the materials with a photon counting detector.

Thesis