Proceedings of the Korean Society of Medical Physics Conference (한국의학물리학회:학술대회논문집)

Korean Society of Medical Physics (한국의학물리학회)
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The Performance of Heavy Ion CT System with Fluorescent Screen and CCD Camera

  • Tomida, Tetsuya (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
  • Nishimura, Katsuyuki (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
  • Abe, Shinji (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
  • Sato, Hitoshi (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
  • Muraishi, Hiroshi (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
  • Inada, Tetsuo (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
  • Tazawa, Shuichi (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
  • Kanai, Tatsuaki (National Institute of Radiological Sciences, Chiba) ;
  • Yusa, Ken (National Institute of Radiological Sciences, Chiba) ;
  • Kawachi, Kiyomitsu (Nuclear Safety Technology Center)
  • Published : 2002.09.01
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Abstract

We have developed and proposed the heavy ion CT system which consists of fluorescent screen and CCD camera equipped with image intensifier. In our system, we have measured the residual range of particles that passed a phantom and reconstructed the CT image for the distribution of relative stopping power by filtered back projection method with Shepp '||'&'||' Logan filter. The heavy ion $\^$12/C accelerated up to 400 MeV/u by HIMAC (Heavy Ion Medical Accelerator in Chiba) was used. Intensity of the beam output changes like macro pulse, the period being 3.3 sec and the width being 2 sec. The series of data was acquired in synchronizing with the pulse, leading to the improvement of S/N in the CT image. The fundamental performance was experimentally evaluated in the proposed system. The spatial resolution was estimated to be about 1 mm and the density resolution (electron density referred to water) to be about 0.01.

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