| Japanese |
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| Title | 201Tlイメージングのための201Hg特性X線ピーク領域におけるエネルギースペクトル解析 |
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| Subtitle | 《原著》 |
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| Authors | 古嶋昭博*, 松本政典**, 大山洋一***, 冨口静二***, 吉良光子***, 高橋睦正*** |
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| Authors(kana) | |
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| Organization | *熊本大学アイソトープ総合センター, **熊本大学医療技術短期大学部診療放射線技術学科, ***熊本大学医学部放射線科 |
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| Journal | 核医学 |
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| Volume | 34 |
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| Number | 2 |
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| Page | 95-103 |
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| Year/Month | 1997/2 |
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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イメージングには, 通常, 比較的エネルギーの低い201Hgの特性X線の光電ピーク領域が用いられている. この特性X線の物体内での散乱について, ガンマカメラと線線源を用いて得られたエネルギースペクトルにより解析した. また, モンテカルロ法を用いたシミュレーションにより相互作用を受けた検出光子のエネルギー分布を分離した. 光電ピークすべてを含む領域内の散乱線と直接線カウントの比(SF)の測定の結果, 201Tlイメージングでは線源からの前方散乱線に加え, 後方散乱線の影響を無視できないことがわかった. また, このSFは光電ピークに中心を持つ対称エネルギーウィンドウよりも高エネルギー側へシフトした非対称エネルギーウィンドウにより減少させることができることがわかった. これらのエネルギースペクトルによる解析は, 新しい散乱線補正法の開発などへの重要な基礎データになるものと考えられる. |
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| Practice | 臨床医学：一般 |
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| Keywords | 201Tl imaging, 201Hg X-ray, Energy spectrum, Scatter fraction, Monte Carlo simulation. |
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| English |
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| Title | Energy Spectral Analysis in a Photopeak Region of 201Hg X-rays for 201Tl Imaging |
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| Subtitle | - Original Articles - |
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| Authors | Akihiro KOJIMA*, Masanori MATSUMOTO**, Yoichi OYAMA***, Seiji TOMIGUCHI***, Mitsuko KIRA***, Mutsumasa TAKAHASHI*** |
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| Authors(kana) | |
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| Organization | *Radioisotope Research Center, Kumamoto University, **Departmet of Radiotogical Technology, Kumamoto University College of Medical Science, ***Department of Radiology, Kumamoto University School Medicine |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 34 |
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| Number | 2 |
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| Page | 95-103 |
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| Year/Month | 1997/2 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | For thallium-201 (201Tl) imaging, a photopeak of X-ray region of mercury-201 (201Hg) around 70 keV is usually employed. In such a low energy region, scatter and attenuation in the body become serious problems for quantitative scintigraphic imaging. We measured energy spectra around 201Hg X-ray region by a 201Tl line source with scattering materials and a gamma camera, and analyzed them to investigate the amount of scattered photons in 201Tl imaging window. Furthermore, Monte Carlo calculations were performed to distinguish primary photons from scattered photons. The results of analysis of energy spectra showed that the 201Hg X-ray photopeak consists of four different X-rays and do not have a perfect Gaussian shape. It was also found that not only forward scatter but also much backward scatter are included in this region. These scattered photons were reduced by using an off-peak window moved toward the higher energy region. We conclude that the data obtained from the analysis of scattered photons in 201Tl imaging window are very useful to develop a new scatter correction method and evaluate the scatter rejection methods proposed. |
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| Practice | Clinical medicine |
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| Keywords | 201Tl imaging, 201Hg X-ray, Energy spectrum, Scatter fraction, Monte Carlo simulation. |
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