^<99m>Tc-tetrofosminによる胆嚢の高集積が心筋SPECT画像に及ぼす影響と改善法についての検討

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The purpose of this study was to estimate the influence of high gall bladder uptake in Technetium-99m myocardial SPECT imaging and to establish improvements of artifacts for better image quality and quantitativeness. In the phantom studies, artifactual defects were observed in the posterior, inferior, and anterior walls when the myocardium/gall bladder radioactive ratio increased(more than 1:1), and they were markedly demonstrated when the ratio increased further(more than 1:2). Marked artifactual defects were also observed when setting gall bladder activity in the myocardial reconstruction area. Although relative activity in myocardial SPECT images increased when the gall bladder was masked, counts in defect areas yielded by artifact did not increase, indicating that quantitativeness was not improved. Masking of gall bladder activity on the projection data was necessary for improvement of image quality and quantity. We examined countermeasures for promoting bile excretion and the "right lateral bending position" in the clinical studies. Radioactivity was decreased 60.2% in the gall bladder and 49.7% in the hepatic bile duct by excreting bile. These counts were increased 50.91% in the apex and 43.55% in the inferior wall by the right lateral bending position. We concluded that we could obtain more accurate image quality and quantitativeness by either promoting bile excretion or using the right lateral bending position.
社団法人日本放射線技術学会の論文
2000-08-20

^<99m>Tc-tetrofosminによる胆嚢の高集積が心筋SPECT画像に及ぼす影響と改善法についての検討

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