SPECT collimator dependency of scatter and validation of transmission dependent scatter compensation methodologies

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

研究成果: Paper査読

抄録

Scatter correction is important for absolute quantification in SPECT. Among the approaches taken to achieve scatter correction, some methods using transmission information for scatter estimation requires the scatter models based on the physical characteristics of the scattered photons. The influence of the SPECT collimator on the characteristics of the scattered photon, however, has not been well studied yet. In this study, we investigated the relationship between scatter and collimator design for the use of the transmission-dependent convolution subtraction (TDCS) method. Monte-Carlo simulations with various collimator acceptance angles and experiments with 4 collimators of 2 SPECT cameras were performed to obtain the scatter fraction (SF) and the line-spread function (LSF) of Tc-99m. The experiments with I-123 also used 6 collimators of 3 SPECT systems to obtain the SF and the LSF. In the simulations, the SF of Tc-99m did not change with the collimator acceptance angles. The LSFs measured for Tc-99m showed an excellent agreement between collimators. In the experiments for I-123. the SF was practically the same for the 6 collimators, although a small difference could be observed, due to the septal penetration. Also, the shape of the LSF was very similar between the collimators. These results reveal that scatter is independent of SPECT collimator design for Tc-99m and even I-123. and that the TDCS could be applicable to scatter correction of I-123 using a unique collimator-independent set of parameters. Detailed instructions are given for preparing manuscripts in camera-ready format for publication in a Conference Issue of the Transactions on Nuclear Science. Papers published in Conference Issues are reproduced directly from the manuscript prepared by the author.

本文言語English
ページ13/148-13/152
出版ステータスPublished - 2000
外部発表はい
イベント2000 IEEE Nuclear Science Symposium Conference Record - Lyon, France
継続期間: 2000 10 152000 10 20

Other

Other2000 IEEE Nuclear Science Symposium Conference Record
国/地域France
CityLyon
Period00/10/1500/10/20

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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