Proceedings of the KOSOMBE Conference (대한의용생체공학회:학술대회논문집)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Collimator Selection in $^{124}Te$ generated $^{123}I$ SPECT imaging

$^{124}Te$ Target로 생산된 $^{123}I$ SPECT 영상에서의 조준기 선택

  • Kim, H.J. (Department of Nuclear Medicine, College of Medicine, University of Ulsan) ;
  • Son, H.K. (Department of Physics, University of Ulsan) ;
  • Bong, J.K. (Department of Physics, Kyonggi University) ;
  • Nam, K.P. (Department of Nuclear Medicine, College of Medicine, University of Ulsan) ;
  • Lee, H.K. (Department of Nuclear Medicine, College of Medicine, University of Ulsan)
  • 김희중 (울산대학교 의과대학 서울중앙병원 핵의학과) ;
  • 손혜경 (울산대학교 이과대학 물리학과) ;
  • 봉정균 (경기대학교 이과대학 물리학과) ;
  • 남기표 (울산대학교 의과대학 서울중앙병원 핵의학과) ;
  • 이희경 (울산대학교 의과대학 서울중앙병원 핵의학과)
  • Published : 1996.05.17
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Abstract

In the case of $^{123}I$ from the $^{124}Te$ (p,2n)reaction, the radionuclidic impurity is the high-energy gamma-emitting $^{124}I$, which interferes greatly with nuclear medicine images. The choice of a collimator can affect the quality of clinical SPECT images of [I-123]MIBG or [I-123]TPT. The tradeoffs that two different collimators make among spatial resolution, sensitivity, and scatter were studied by imaging a line source at 5cm, 10cm, 15cm distance using a number of plexiglass sheets between source and collimator, petri dist two-dimensional Hoffman brain phantom, and Jaszczak phantom after filling with $^{123}I$ (FWHM, FWTM, Sensitivity) for low energy ultra high resolution parallel hole(LEUHRP) collimator and medium energy general purpose (MEGP) collimator were measured as (9.27mm, 61.27mm $129CPM/[\mu}$ Ci) and (10.53m 23.17mm $105CPM/{\mu}$ Ci), respectively. The image quality of two-dimensional Hoffman brain Phantom with LEUHRP looked better than the one with MEGP. However, the image quality of Jasgczak phantom with LEUHRP looked much worse than the one with MEGP, The results suggest that the MEGP is preferable to LEUHRP for SPECT studies of [I-123]MIBG or [I-123]IPT.

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