| Japanese |
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| Title | 201Tlイメージングに対するTEW法の適用に関する研究 |
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| Subtitle | 原著 |
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| Authors | 小野時成*, 尾川浩一* |
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| Authors(kana) | |
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| Organization | *法政大学工学部電子情報学科 |
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| Journal | 核医学 |
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| Volume | 35 |
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| Number | 8 |
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| Page | 705-713 |
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| Year/Month | 1998/10 |
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| Article | 原著 |
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| Publisher | 日本核医学会 |
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| Abstract | 「要旨」 201Tlのイメージングでは複数のK-X線が用いられ, これらの放射線のエネルギーが低いために, 光電ピーク部に混在する散乱線は, 高次(散乱回数が複数回)のコンプトン散乱線となる. 本論文では201Tl心筋イメージングに対してTEW法を適用した散乱線の除去に関して, 実際のデータ収集に近い条件のMonte Carloシミュレーションを行い, エネルギーウィンドウの設定に関する検討を行った. この結果, TEW法のmain windowの幅が20%, 30%, 40%の場合, 中心エネルギーをそれぞれ66〜68keV, 69〜70keV, 72〜73keVに設定することによって, 散乱光子の推定誤差を最小化できることがわかった. また, main windowを設定する際の中心エネルギーを71keVに固定した場合, main window幅20%, 30%, 40%に対して, それぞれsub-windowの幅を5〜7%に設定することによって散乱光子の推定誤差を最小にできることがわかった. |
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| Practice | 臨床医学：一般 |
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| Keywords | Scatter correction, Single photon emission CT, Triple-energy-window method, Monte Carlo simulation, 201Tl myocardial imaging |
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| English |
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| Title | On the Application of the Triple Energy Window Method to the 201Tl Imaging |
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| Subtitle | |
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| Authors | Tokinari ONO, Koichi OGAWA |
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| Authors(kana) | |
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| Organization | Department of Electronic Informatics, College of Engineering, Hosei University |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 35 |
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| Number | 8 |
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| Page | 705-713 |
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| Year/Month | 1998/10 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] In the radionuclide imaging by 201Tl several K-X rays are acquired, so it is difficult to eliminate scattered photons in the acquired photons. This paper describes the limitation and efficiency of the triple energy window (TEW) method in the application of 201Tl myocardial studies. We evaluated the TEW method by simulations and the setting of the parameters in the TEW method were 20, 30 and 40% for the width of the main window, 3, 5 and 7% for the width of the two sub-windows. Moreover, the location of the main window was shifted by each 1 keV from 60 to 80 keV. Simulation results were evaluated with the mean square error between true scattered photons and estimated scattered photons. The results show that the mean square error was minimized when the widths of the main window were 20, 30 and 40%, and the centers of the main window were 66-68, 69-70 and 72-73 keV, respectively. |
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| Practice | Clinical medicine |
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| Keywords | Scatter correction, Single photon emission CT, Triple-energy-window method, Monte Carlo simulation, 201Tl myocardial imaging |
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