| Japanese |
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| Title | トランスミッション・エミッションデータ同時収集法による吸収補正の有用性と問題点 - 健常成人例およびファントムを用いた検討 - |
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| Subtitle | 《原著》 |
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| Authors | 木島鉄仁*, 汲田伸一郎*, 水村直*, 趙圭一*, 石原眞木子*, 鳥羽正浩*, 隈崎達夫*, 高橋宗尊** |
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| Organization | *日本医科大学放射線科, **島津製作所 |
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| Journal | 核医学 |
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| Volume | 34 |
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| Number | 3 |
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| Page | 167-176 |
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| Year/Month | 1997/3 |
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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」Transmission Computed Tomography(TCT)データとEmission Computed Tomography(ECT)データとを同時に収集する吸収補正法を用い, 201TlCl(T1)心筋SPECTにおける有用性と問題点につき成人健常例およびファントムを使用した検討を行った. その結果, 成人健常例では吸収補正により心筋左室中隔および後壁の集積は改善し, 相対的に側壁の集積は低下した(p<0.05: paired t-test). しかし吸収補正後の後壁の集積は前壁および側壁より有意に高く(p<0.05: unpaired t-test), 心尖部の集積低下はより明瞭となった. ファントムを用いた検討では吸収補正後の後壁の高集積は肝臓などの腹部Tl集積臓器からの自己散乱線に起因し, また心尖部の集積低下は心拍動に伴った部分容積効果が影響していることが示された. TCT・ECT両データ同時収集法は有用な吸収補正法と考えられたが, 今後自己散乱線の補正とともに心拍同期SPECTへの対応が期待された. |
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| Practice | 臨床医学：一般 |
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| Keywords | Attenuation correction, Thallium-201 myocardial SPECT, Self scatter, Partial volume effect. |
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| English |
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| Title | The Usefulness and the Problems of Attenuation Correction Using Simultaneous Transmission and Emission Data Acquisition Method : Studies on Normal Volunteers and Phantom |
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| Subtitle | - Original Articles - |
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| Authors | Tetsuji KIJIMA*, Shin-ichiro KUMITA*, Sunao MIZUMURA*, Keiichi CHO*, Makiko ISHIHARA*, Masahiro TOBA*, Tatsuo KUMAZAKI*, Munehiro TAKAHASHI** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, Nippon Medical School, **Shimadzu Corporation |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 34 |
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| Number | 3 |
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| Page | 167-176 |
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| Year/Month | 1997/3 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | Attenuation correction using simultaneous transmission data (TCT) and emission data (ECT) acquisition method was applied to 201Tl myocardial SPECT with ten normal adults and the phantom in order to validate the efficacy of attenuation correction using this method. Normal adults study demonstrated improved 201Tl accumulation to the septal wall and the posterior wall of the left ventricle and relative decreased activities in the lateral wall with attenuation correction (p<0.05: paired t-test). The counts of the posterior wall were, however, significantly higher than those of the anterior wall and the lateral wall (p<0.05: unpaired t-test). Moreover, relative low uptake of the apex was enhanced using attenuation correction. Static phantom studies revealed the self scatter from high 201Tl uptake organs such as the liver and the stomach pushed up the activities in the septal wall and the posterior wall. Cardiac dynamic phantom studies showed partial volume effect due to cardiac motion contributed to under-correction of the apex, which might be overcome using gated SPECT. Although simultaneous TCT and ECT acquisition was conceived of the advantageous method for attenuation correction, miss-correction of the special myocardial segments should be taken into account in assessment of attenuation correction compensated images. |
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| Practice | Clinical medicine |
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| Keywords | Attenuation correction, Thallium-201 myocardial SPECT, Self scatter, Partial volume effect. |
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