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

Min Kim Kyeong Min Kim, H. Watabe, M. Shidahara, Y. Ishida, H. Iida

研究成果: Conference article査読

22 被引用数 (Scopus)

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 require 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 paper, we investigate 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 four collimators of two 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 six collimators of three 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 six 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, and the counts in the background region of reconstructed images did not differ when using different sets of TDCS parameters. These results reveal that scatter is independent of SPECT collimator design for Tc-99m even I-123, and that the TDCS could be applicable to scatter correction of I-123 using a unique collimator-independent set of parameters.

本文言語English
ページ(範囲)689-696
ページ数8
ジャーナルIEEE Transactions on Nuclear Science
48
3 II
DOI
出版ステータスPublished - 2001 6月
外部発表はい
イベント2000 Medical Imaging Conference (MIC) - Lyon, France
継続期間: 2000 10月 152000 10月 20

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 原子力エネルギーおよび原子力工学
  • 電子工学および電気工学

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