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

Korean Society of Medical Physics (한국의학물리학회)
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Line Image Correction of the Positron Camera in the Secondary Beam Course of HIMAC

  • Iseki, Yasushi (Dept. of Energy Sciences, Tokyo Institute of Technology, Nagatsuta, Yokohama, Japan, Power & Industrial Systems R&D Center, Toshiba Corp.) ;
  • Mizuno, Hideyuki (Saitama Cancer Center, Ina-machi, Saitama, Japan) ;
  • Kanai, Tatsuaki (National Institute of Radiological Sciences) ;
  • Kanazawa, Mitsutaka (National Institute of Radiological Sciences, Dept. of Energy Sciences, Tokyo Institute of Technology, Nagatsuta, Yokohama, Japan) ;
  • Kitagawa, Atsushi (National Institute of Radiological Sciences) ;
  • Suda, Mitsuru (National Institute of Radiological Sciences) ;
  • Tomitani, Takehiro (National Institute of Radiological Sciences) ;
  • Urakabe, Eriko (National Institute of Radiological Sciences)
  • Published : 2002.09.01
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Abstract

A positron camera, consisting of a pair of Anger-type scintillation detectors, has been developed for verifying the ranges of irradiation beams in heavy-ion radiotherapy. Images obtained by a centroid calculation of photomultiplier outputs exhibit a distortion near the edge of the crystal plane in an Anger-type scintillation detector. The images of a $\^$68/Ge line source were detected and look-up tables were prepared for the position correction parameters. Asymmetry of the position distribution detected by the positron camera was prevented with this correction. As a result, a linear position response and a position resolution of 8.6 mm were obtained over a wide measurement field.

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