Consideration of backscatter photons for edge detection in SPECT

H. Watabe, M. Shidahara, K. M. Kim, H. Iida

研究成果: Paper査読


It is important to obtain an accurate attenuation map in order to produce quantitative SPECT image. Compton Scatter Window (CSW) technique has been proposed to get the outline of the object in SPECT. This method requires no additional scan or transmission source and is capable to rapidly and easily estimate the edge of the object. Our goal of this study is to estimate ihe optimized energy window for Compton scattered photon in order to obtain ihe accurate edge of the object. We especially focused on the scatter photons which are scattered at the one camera and entered to the another camera (backscatter photons) for the dual-head SPECT system. In order to evaluate the effect of the backscatter photons we performed Monte-Carlo simulation. In the simulation, a circular phantom of 15 cm diameter filled with water was located between two cameras which were 25.6 cm apart each other. The radioactive source of Tc-99m was either uniformly distributed in the phantom (the uniform phantom) or placed at the center of the phantom (the hot spot phantom). Spatial and energy distributions of the backscatter photons were examined. According to the simulation results, the optimized energy window for CSW technique was 95-123 keV and 102-112 keV for the uniform phantom and the hot spot phantom, respectively.

出版ステータスPublished - 2000 12 1
イベント2000 IEEE Nuclear Science Symposium Conference Record - Lyon, France
継続期間: 2000 10 152000 10 20


Other2000 IEEE Nuclear Science Symposium Conference Record

ASJC Scopus subject areas

  • 放射線
  • 核物理学および高エネルギー物理学
  • 放射線学、核医学およびイメージング


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