Development of a lead x-ray compensation method in simultaneous tl-201 spect & tc-99m tct using a flood source

N. Motomura, T. Ichihara, H. Hasegawa, K. Ogawa, J. Hashimoto, A. Kubo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have developed an uncollimated sheet line source with a fluoroplastic tube for gamma ray transmission CT (TCT). This source filled with Tc-99m was attached to the collimator face on one head of a dual head single photon emission computed tomography (SPECT) system. In simultaneous SPECT/TCT scans using Tl-201 as the SPECT source and Tc-99m as the TCT source, scatter and spilldown contamination in the Tc-99m (141 keV) data and the Tl-201 (75 keV) data can be removed with the triple energy window (TEW) method. However, lead X-ray contamination in the Tl-201 data cannot be removed with the TEW method. We have developed an estimation method of the lead X-ray contamination in the Tl-201 data. This method depends on the hypothesis that the lead X-ray is proportional to the amount of attenuating media and primary photons along each projection path. The amount of attenuating media is given by a transmission image and that of primary photons is estimated by the TEW method. The coefficients needed for this estimation are experimentally determined by only Tc-99m TCT scan data. The feasibility of the proposed method was demonstrated by a chest phantom study and a myocardial clinical study.

Original languageEnglish
Pages (from-to)2459-2464
Number of pages6
JournalIEEE Transactions on Nuclear Science
Issue number6 PART 2
Publication statusPublished - 1997

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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