| Japanese |
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| Title | 99mTc-GSA肝シンチグラフィの視覚的評価に影響をおよぼす各種画像表示系の検討 |
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| Subtitle | 原著 |
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| Authors | 河村誠治* |
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| Organization | *久留米大学病院画像診断センター |
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| Journal | 核医学 |
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| Volume | 35 |
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| Number | 5 |
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| Page | 281-292 |
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| Year/Month | 1998/6 |
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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」99mTc標識ガラクトシル人血清アルブミンジエチレントリアミン五酢酸(99mTc-GSA)を用いた肝シンチグラフィの視覚的評価時の白黒モニタとカラーモニタなどの画像表示系の設定条件の検討をフィルム系を含め総合的に行った. 画像表示系ごとに, 計数に対するモニタの輝度に変換するための7種類の変換曲線(キャリブレーションカーブ, CC)を用意した. モニタの輝度とフィルムの黒化度の関係を検討するとともに, この7種類のCCによって, 123例の99mTc-GSA投与後5分〜6分の1分間の肝シンチグラフィ画像を変換し(画像表示系ごとに861枚), 16人の観察者により, 用意した5段階の基準に従い視覚的に分類した. モニタの輝度とフィルムの黒化度は正の相関を示し, 両者のCCを一元化できた. フィルム系において傾斜4.2の至適CCが存在するのと同様に, 白黒モニタとカラーモニタなどの画像表示系にも至適CCが存在し, 両モニタとも約4.8の傾斜を持ったCCが血液生化学的肝機能検査値ならびにアシアロ肝シンチにより得られる肝機能の指標と最もよく相関した. シンチグラフィを視覚的に評価するためには, 他のシンチグラフィ検査にも画像表示系ごとに至適CCを準備することの必要性が示唆された. |
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| Practice | 臨床医学：一般 |
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| Keywords | 99mTc-GSA, Liver, In vivo, Radiopharmaceuticals, Visual analysis, Grade classification |
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| English |
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| Title | Assessment of the Various Image Display Systems Affected to the Visual Analysis Using 99mTc-GSA Liver Scintigraphy |
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| Subtitle | Original Articles |
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| Authors | Seiji KAWAMURA |
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| Authors(kana) | |
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| Organization | Center for Diagnostic Imaging, Kurume University Hospital |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 35 |
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| Number | 5 |
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| Page | 281-292 |
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| Year/Month | 1998/6 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | The aim of this study was to evaluate the physical performance for the gray-scale monitor and the image display system of the color monitor with the films using the visual analysis of the liver scintigraphy by 99mTc-DTPA-galactosyl-human serum albumin (GSA). The seven kinds of calibration curves (CC) were applied to convert into both the counts of the density of the films and the intensity of the monitors. The relationship between the intensity and density was evaluated in the 123 patients suspected with hepatic dysfunction. The liver scintigraphy images of 1-minute duration from five to six minutes after administration of 99mTc-GSA were converted according to the seven kinds of CC (861 images per image display system). These images were visually classified by the 16 observers following the five-point scoring system arranged beforehand. The intensity of monitors and the density of films showed positive correlation. Thus the CC for both the intensity and the density was centralized. The CC obtained by the present study was suitable for both monitors and films, respectively. The CC, which had the slope of approximately 4.8 for the monitor and 4.2 for the film, showed a good correlation between the indices of liver functions obtained from the biochemical liver function tests and from the 99mTc-GSA liver scintigraphy. Data suggest that the suitable CC in the three sets of image display system may contribute to the other scintigraphy as well as 99mTc-GSA liver scintigraphy, evaluating the scintigraphy using the visual analysis. |
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| Practice | Clinical medicine |
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| Keywords | 99mTc-GSA, Liver, In vivo, Radiopharmaceuticals, Visual analysis, Grade classification |
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