| Japanese |
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| Title | MIBI心筋シンチのアーティファクトの原因に関して |
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| Subtitle | 短報 |
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| Authors | 今井嘉門*, 浅川喜祐*, 星野寛倫*, 堀江俊伸*, 堀内孝一**, 斎藤頴**, 小沢友紀雄**, 上松瀬勝男** |
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| Organization | *埼玉県立小原循環器病センター循環器内科, **日本大学医学部第二内科 |
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| Journal | 核医学 |
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| Volume | 32 |
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| Number | 3 |
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| Page | 307-310 |
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| Year/Month | 1995/3 |
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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」安静時/運動負荷時MIBI心筋シンチの安静画像では胆嚢に高度なMIBI集積を認める. この集積が画質に如何なる影響を与えるか, その改善策に関して検討した. 対象は心筋シンチを施行した90症例のうち, 運動負荷時では正常像であるにもかかわらず, 安静時では欠損像を示した15症例で, 投影画像でMIBIの集積した胆嚢などを削除する前後でSPECTを再構成した. 心臓外の集積部位を削除した後のSPECTでは, 患者の66% (10/15) で, 区画の37% (33/89) で安静時の灌流画像の改善を認めた. さらに局所ごとの改善は前壁21% (4/19), 中隔38% (11/29), 後壁43% (16/37) および側壁50% (2/4) であった. 心臓外のMIBI集積はアーティファクトの原因の一つで, これを防止するため胆汁排泄の促進に加え, 心臓以外のMIBI高度集積部位をコンピュータ上で投影画像より削除し, SPECTを再構成することは画像改善策の一つと考えられる. |
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| Practice | 臨床医学：一般 |
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| Keywords | 99mTc-methoxy isobutylisonitrile (MIBI), Myocardial scintigraphy, Extra-cardiac accumulation, Artificial perfusion defect |
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| English |
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| Title | Artificial Defect on Myocardial SPECT Image due to Extra-cardiac MIBI Accumulation |
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| Subtitle | |
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| Authors | Kamon IMAI*, Kihiro ASAKAWA*, Hirotsugu HOSHINO*, Toshinobu HORIE*, Kou-ichi HORIUCHI**, Satoshi SAITO**, Yukio OZAWA**, Katsuo KAN-MATSUSE** |
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| Authors(kana) | |
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| Organization | *Department of Cardiology, Saitama Cardiovascular Center, **Second Department of Internal Medicine, Nihon University School of Medicine |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 32 |
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| Number | 3 |
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| Page | 307-310 |
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| Year/Month | 1995/3 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] If 99mTc-methoxy isobutylisonitrile (MIBI) myocardial scintigraphy was performed on the rest-stress protocol, MIBI accumulated in extra-cardiac area, gallbladder or liver, on rest image significantly. The purpose of this study was to evaluate whether extra-cardiac MIBI accumulation influences the quality of myocardial images. Rest-stress MIBI myocardial scintigraphy was performed in 90 patients. Fifteen patients showed defects on rest image in spite of normal findings on stress image. Before and after removing the area of extra-cardiac MIBI accumulation on projection images, SPECT was reconstructed in the 15 patients. Perfusion defect on rest image improved in 66% of patients (10/15) and 37% of total segments (33/89) by removing the area of extra-cardiac MIBI accumulation. Furthermore, it was 21% (4/19), 38% (11/29), 43% (16/37) and 50% (2/4) in anterior, septum, posterior and lateral segments respectively. Significant MIBI extra-cardiac accumulation, especially in the gallbladder, is one of the causes of artificial defects on rest image. Thus, reconstruction of SPECT after removing area of MIBI extra-cardiac accumulation will be an appropriate method to improve the quality of MIBI images. |
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| Practice | Clinical medicine |
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| Keywords | 99mTc-methoxy isobutylisonitrile (MIBI), Myocardial scintigraphy, Extra-cardiac accumulation, Artificial perfusion defect |
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