| Japanese |
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| Title | 2核種同時収集による肺の81mKr換気 / 99mTc大凝集アルブミン血流SPECT, および, 換気 / 血流比画像の作成 |
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| Subtitle | 短報 |
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| Authors | 本田憲業*, 町田喜久雄*, 間宮敏雄*, 高橋卓*, 釜野剛*, 鹿島田明夫*, 井上優介*, 長田久人*, 伴隆一** |
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| Authors(kana) | |
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| Organization | *埼玉医科大学総合医療センター放射線科学教室, **島津製作所医用技術部 |
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| Journal | 核医学 |
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| Volume | 30 |
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| Number | 7 |
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| Page | 789-794 |
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| Year/Month | 1993/7 |
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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」肺換気/血流(V/Q)比分布の横断面での観察を目的とした, 81mKrガスと99mTc大凝集アルブミン(MAA)による肺V/Q断層撮影(SPECT)の方法を報告した. 混信補正は混信分を差し引いて行った. 補正によりファントム実験では, 99mTcの81mKrウインドウへの混信(R12), 81mKrの99mTcウインドウへの混信(R21)は, それぞれ, 85%, 83%減少した. 臨床例9例(平均年齢56.1歳, 範囲38-82歳)でR12, R21を測定した. R12, R21は, それぞれ, 平均1.3%(範囲1.0-1.9%), 平均41.9%(範囲34.6-55.3%)であった. 上記9例中7例を対象に, 99mTc-MAA 185 MBqを仰臥位で静注後, 81mKrガスを持続投与し, 回転型ガンマカメラにより2核種同時収集を施行した(360度回転, 64方向, 20秒/方向). 各対象ごとの実測R12, R21を用いて, 横断像再構成後に混信補正を行った. 検査時間は約40分で, 全例にV/Q比の横断面画像が作成可能であった. |
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| Practice | 臨床医学：一般 |
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| Keywords | Ventilation/perfusion ratio, Single photon emission CT, Dual-energy data acquisition, Cross-talk, 81mKr, 99mTc-macroaggregated albumin. |
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| English |
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| Title | Dual-Energy Data Acquisition for Simultaneous 81mKr Ventilation / 99mTc-MAA Perfusion SPECT : Ventilation / Perfusion Ratio Mapping in Cross Section |
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| Authors | Norinari HONDA*, Kikuo MACHIDA*, Toshio MAMIYA*, Taku TAKAHASHI*, Tsuyoshi KAMANO*, Akio KASHIMADA*, Yusuke INOUE*, Hisato OSADA*, Ryuichi BAN** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, Saitama Medical Center, Saitama Medical School, **Shimadzu Corporation |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 30 |
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| Number | 7 |
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| Page | 789-794 |
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| Year/Month | 1993/7 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary]Methods of simultaneous pulmonary ventilation/perfusion (V/Q) tomogram (SPECT) for V/Q ratio mapping were reported. Crosstalk was corrected by subtraction assuming crosstalk/signal ratio is constant for an individual examination. Crosstalk was reduced by 85% for that of 99mTc-to-81mKr window (R12), and by 83% for that of 81mKr-to-99mTc window (R21) in a phantom experiment. The R12 and R21 were 1.0-1.9% (mean 1.3%) and 34.6-55.3% (mean 41.9%), respectively in 9 patients (mean age, 56.1 years; range, 38-82 years). V/Q SPECT was undertaken in 7 of the 9 patients. 99mTc-macroaggregated albumin (185 MBq) was injected intravenously in supine position, and 81mKr gas was administered continuously during the SPECT data acquisition. Sixty-four 64×64-matrix (size=8mm/pixel) images, 20-second acquisition time for each, were collected by a rotating gamma camera in a step-and-shoot fashion during a 360-degree rotation with the two photopeaks, one at 140 keV for 99mTc and another at 190 keV for 81mKr. Examination time was about 40 minutes, and the V/Q ratio maps in cross section were obtained in all of the examinations. |
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| Practice | Clinical medicine |
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| Keywords | Ventilation/perfusion ratio, Single photon emission CT, Dual-energy data acquisition, Cross-talk, 81mKr, 99mTc-macroaggregated albumin. |
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