| Japanese |
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| Title | 散乱, 吸収補正による心筋SPECTの定量化 |
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| Subtitle | 《短報》 |
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| Authors | 橋本順*, 三宮敏和*, 小笠原克彦*, 久保敦司*, 尾川浩一**, 市原隆***, 本村信篤***, 長谷川兵治*** |
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| Authors(kana) | |
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| Organization | *慶應義塾大学医学部放射線科, **法政大学工学部電気工学科, ***東芝医用機器技術研究所 |
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| Journal | 核医学 |
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| Volume | 33 |
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| Number | 9 |
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| Page | 1015-1019 |
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| Year/Month | 1996/9 |
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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」TEW散乱線補正法とトランスミッションスキャン(TCT)を併用して心筋SPECTの散乱, 吸収補正を行った. トレーサとして201TlClを, TCT用の外部線源として99mTcを使用した. 平行多孔コリメータを装着した2検出器型SPECT装置を使用し, 99mTc面線源をトランスミッション線源として1検出器の前面に設置した. データ収集方法はTCT終了後にトレーサを投与してエミッションスキャン(ECT)を行う別収集法と, トレーサを先に投与してTCTとECTを同時に行う同時収集法の2通りの方法を検討した. ファントム実験では別収集法と同時収集法の双方で散乱, 吸収補正後の心筋全体のSPECTカウント値は真値に近く, 誤差は5%未満であった. 補正により部位ごとのカウントのばらつきも減少した. 本法は平行多孔コリメータで施行可能で, トランケーションアーチファクトの問題がなく, 実用的な補正法であると考えられる. |
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| Practice | 臨床医学：一般 |
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| Keywords | Quantitative myocardial SPECT, 201TlCl, Scatter correction, Attenuation correction, Transmission CT. |
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| English |
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| Title | Scatter and Attenuation Correction for Quantitative Myocardial SPECT Imaging |
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| Authors | Jun HASHIMOTO*, Toshikazu SAMMIYA*, Katsuhiko OGASAWARA*, Atsushi KUBO*, Koichi OGAWA**, Takashi ICHIHARA***, Nobutoku MOTOMURA***, Hyoji HASEGAWA*** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, School of Medicine, Keio University, **College of Engineering, Hosei University, ***Toshiba Medical Engineering Laboratory |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 33 |
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| Number | 9 |
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| Page | 1015-1019 |
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| Year/Month | 1996/9 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | We performed scatter and attenuation compensation in 201Tl myocardial SPECT using the triple-energy-window (TEW) scatter correction method and 99mTc transmission scan (TCT). A dual-headed SPECT gammacamera system equipped with parallel-hole collimators was employed for imaging and a sheet source for TCT was attached to the surface of one of the two detectors. Two imaging protocols, a sequential mode and a simultaneous mode, were examined. In the sequential mode, TCT was performed prior to the administration of the tracer and then ECT was carried out. On the other hand, the injection was followed by a simultaneous transmission-emission scan, in the simultaneous mode. Results of phantom studies showed that reconstructed SPECT values of the whole myocardium were almost equal to the true value with errors of less than 5 per cent, and that more homogeneous images were obtained by performing scatter and attenuation correction. We conclude that this correction method was clinically practical and cost-effective because it uses parallel-hole collimators and does not require fan-beam collimators which may produce truncation artifacts. |
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| Practice | Clinical medicine |
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| Keywords | Quantitative myocardial SPECT, 201TlCl, Scatter correction, Attenuation correction, Transmission CT. |
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