| Japanese |
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| Title | シンチカメラでの99mTcと他核種(201Tl, 123Iまたは111In) の同時収集における Crosstalk - ファントム実験による基礎的検討 - |
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| Subtitle | 技術報告 |
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| Authors | 三枝健二*, 福士政広*, 齋藤秀敏*, 入船寅二* |
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| Organization | *東京都立医療技術短期大学診療放射線学科 |
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| Journal | 核医学 |
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| Volume | 30 |
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| Number | 2 |
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| Page | 209-217 |
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| Year/Month | 1993/2 |
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| Article | 報告 |
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| Publisher | 日本核医学会 |
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| Abstract | 「要旨」99mTcと201Tl, 123Iまたは111Inのいずれか1核種の同時収集における各光電ピークウインドウ中への crosstalk の影響を調べた. 10×10×10cm3の直方体ファントムに, 放射能各7.4MBqを含む水溶液を線源とした. 4種のコリメータを使用し, 測定したγ線スペクトルから各エネルギーウインドウに含まれる crosstalk の割合を求めた. どの2核種の場合も, crosstalk の割合は中エネルギー用コリメータで最小であった. また, 線源容積(液厚)の増大による変化は比較的小さく, ウインドウ幅の大きさでは30%に広げた場合を除き, 10 - 20%の範囲でわずかな増加傾向であった. 中エネルギー用コリメータを使用し, 液厚5cm, ウインドウ幅15%に設定したときの crosstalk は, 9.4%(201Tlウインドウ)と7.3%(99mTcウインドウ), 36.1%(99mTcウインドウ)と14.8%(123Iウインドウ), そして32.6%(99mTcウインドウ)と6.1%(111In 171keV ウインドウ)であった. |
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| Practice | 臨床医学：一般 |
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| Keywords | Simultaneous acquisition, Gamma ray spectrum, Crosstalk, 99mTc, 201Tl, 123I, 111In |
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| English |
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| Title | Crosstalks onto Photopeak Windows of 99mTc and Other Radionuclide (201Tl, 123I or 111In) in Simultaneous Acquisitions Using a Scinticamera - A Fundamental Study through Phantom Experiments - |
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| Subtitle | Summary |
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| Authors | Kenji SAEGUSA, Masahiro FUKUSHI, Hidetoshi SAITOH, Toraji IRIFUNE |
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| Authors(kana) | |
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| Organization | Division of Radiological Technology, Tokyo Metropolitan College of Allied Medical Sciences |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 30 |
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| Number | 2 |
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| Page | 209-217 |
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| Year/Month | 1993/2 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | In simultaneous acquisitions of both 99mTc and other radionuclide, there are crosstalks onto those photopeak windows. Therefore, to quantify the organ uptake in scintigraphic imaging, it is important to correct the crosstalk counts. The purpose of this study is to estimate the crosstalk fractions onto each photopeak window from other radionuclide. Those crosstalk fractions were determined from pulse height spectra, which were measured by inputting signals from a scinticamera into a multi-channel (2048 ch) pulse height analyzer. Four types of collimators, which are HR (high resolution), AP (all purpose) for low energy, ME (medium energy) and HE (high energy), as well as cuboid phantoms (10×10×10 cm3) were used in this experiment. The crosstalk fractions have a tendency to show small increases at the window width of 10 to 20%, excepting at 30%, a small change for the source thickness from 1 to 7 cm, and the least with the ME-collimator. The crosstalk fractions using the ME-collimator were obtained as follows, when the source thickness and the window width were 5 cm and 15%, respectively. 99mTc and 201Tl: 9.4% onto 201Tl window and 7.3% onto 99mTc window, 99mTc and 123I: 36.1% onto 99mTc window and 14.8% onto 123I window, 99mTc and 111In: 32.6% onto 99mTc window and 6.1% onto 111In window. |
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| Practice | Clinical medicine |
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| Keywords | Simultaneous acquisition, Gamma ray spectrum, Crosstalk, 99mTc, 201Tl, 123I, 111In |
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