Japanese
Title肝高集積が原因となって出現する123I-MIBG心筋SPECTの下壁欠損像の特徴とその対策 - ファントムを用いた検討 -
Subtitle原著
Authors小林秀樹*, 寺田慎一郎*, 金谷信一*, 柏倉健一*, 百瀬満*, 細田瑳一**, 日下部きよ子*
Authors(kana)
Organization*東京女子医科大学放射線科, **循環器内科
Journal核医学
Volume31
Number4
Page359-366
Year/Month1994/4
Article原著
Publisher日本核医学会
Abstract「要旨」123I-MIBG心筋シンチグラフィのSPECT画像上で, 肝/心カウント比が著明に上昇した症例に認められる下壁心筋カウント低下の特徴とその対策について, ファントムを用いて検討した. ファントムの肝臓と心臓のRI濃度比が2:1以上の設定では, 肝隣接部の心筋カウントが著しく低下し, 視覚的な偽欠損像が出現した. 同部のカウント低下は, 180度再構成SPECT像において360度再構成SPECT像より著明であった. 肝臓の位置を心臓より下げてすべての投影データ上で肝臓と心臓が重ならない配置 (vanishing liver position) にすると, 肝隣接部の心筋カウント低下は消失した. 後下壁の生理的なMIBG摂取低下に加えて, 肝/心カウント比が上昇した症例では肝臓に隣接する後下壁に偽欠損が出現し得るので, SPECT像の読影に注意を要するとともに, 偽欠損像の出現を防ぐMIBG心筋SPECT撮像法の確立が必要と考えられた.
Practice臨床医学：一般
Keywords123I-metaiodobenzylguanidine (MIBG) , Inferior defect, Liver uptake, SPECT, Vanishing liver position.
English
TitleArtifactual Defect of Inferior Myocardium on 123I-Metaiodobenzylguanidine Myocardial SPECT : Characteristic Findings and Preventive Method on Phantom Study
SubtitleOriginal Articles
AuthorsHideki KOBAYASHI*, Shinichiro TERADA*, Shinichi KANAYA*, Kenichi KASHIKURA*, Mitsuru MOMOSE*, Saichi HOSODA**, Kiyoko KUSAKABE*
Authors(kana)
Organization*Department of Radiology, **Department of Cardiology, Tokyo Women's Medical College Hospital
JournalThe Japanese Journal of nuclear medicine
Volume31
Number4
Page359-366
Year/Month1994/4
ArticleOriginal article
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary] Discordance between planar and SPECT image of inferior myocardial defect on 123I-metaiodobenzylguanidine myocardial scintigraphy (MIBG) was occasionally observed in the clinical studies. The purpose of this study is to clarify the existence of artifactual myocardial defect on MIBG SPECT image. Phantom study was performed in various kinds of situation using triple gamma camera. Artifactual defect adjacent to the liver was significantly observed in the case of increased liver/heart uptake ratio more than 2:1. Artifactual defect was markedly observed in the 180 degree than that in the 360 degree SPECT acquisition. To avoid artifactual defect during SPECT acquisition, liver phantom was moved down to the foot direction (vanishing liver position) . In this phantom position, artifactual defect adjacent to the liver was not observed on reconstructed myocardial SPECT image. The vanishing liver position was also applicable to human study. Human body was inclined to right side at an angle of 15 degree, artifactual defect could be avoided. Further study is needed to analyze the cause of this artifactual defect and to conform the preventive method with vanishing liver position in the routine myocardial SPECT examination.
PracticeClinical medicine
Keywords123I-metaiodobenzylguanidine (MIBG) , Inferior defect, Liver uptake, SPECT, Vanishing liver position.

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