Practical compensation method of downscattered component due to high energy photon in 123I imaging

Nobutoku Motomura, Takashi Ichihara, Takuzo Takayama, Shigeru Aoki, Hitoshi Kubo, Kan Takeda

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We looked into the problem that the quantitative values of 123I data vary according to collimator type. First, we made the assumption that the quantitative values of 123I data are degraded by the scattered photons from the 529 keV component which contaminate the 159 keV imaging data. Then, the 123I Dual Window (IDW) method was proposed to improve the quantitative values of the 123I data. The IDW method uses the energy window on the high-energy side to estimate the amount of scattered 529 keV photons which contaminate the 159 keV data. Since only a dual-energy window acquisition and a simple image processing are needed, the IDW method can be performed in most conventional gamma camera systems. In the torso phantom studies, the IDW method reduced the error in the semi-quantitative value 'heart/mediastinum (H/M) ratio' n 123I-MIBG myocardial scintigraphy from 22% to 1%. The results of the phantom studies indicate that the IDW method can improve the quantitative values of 123I data.

Original languageEnglish
Pages (from-to)997-1005
Number of pages9
JournalKakuigaku
Volume36
Issue number9
Publication statusPublished - 01-12-1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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    Motomura, N., Ichihara, T., Takayama, T., Aoki, S., Kubo, H., & Takeda, K. (1999). Practical compensation method of downscattered component due to high energy photon in 123I imaging. Kakuigaku, 36(9), 997-1005.