| Japanese |
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| Title | 心プール・ゲート・イメージからの左心室自動輪郭抽出法 - I. 方法論 - |
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| Subtitle | 原著 |
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| Authors | 細羽実*, 和迩秀信*, 広江道昭**, 日下部きよ子** |
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| Authors(kana) | |
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| Organization | *島津製作所 医用技術部, **東京女子医大 核医学 |
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| Journal | 核医学 |
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| Volume | 21 |
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| Number | 10 |
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| Page | 1229-1236 |
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| Year/Month | 1984/10 |
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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」心電図同期心プール像から, 完全自動的に左心室の輪郭を抽出し, 駆出率(EF), 心室容積曲線を求める実用的方法を開発した. 本論文ではアルゴリズムの詳細を報告する. 本法の特徴は以下に要約される. (1)最適化の可能な前処理フィルタを適用し, 異なった雑音状態の画像に対しても安定した輪郭抽出を可能とした. (2)余弦・正弦画像を算出し心房部と心室部を分離し, 左心室中心を自動的に求めた. (3)最適化した二乗フィルタを作成しコントラストの強調を行った. (4)左室中心から放射状プロフィールを求めフーリエ級数近似後, プロフィールごとに局所閾値を超える点を辺縁とした. (5)各辺縁点はフーリエ級数により滑らかに接続して輪郭とした. (6)複数個のデータに対して連続処理を可能とした. |
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| Practice | 臨床医学：一般 |
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| Keywords | Automated contour detection, Gated blood pool study, Butterworth filter, SINE, COSINE transform, Fourier filtering. |
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| English |
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| Title | Fully Automated Left Ventricular Contour Detection for Gated Radionuclide Angiography : (I) Methods |
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| Subtitle | Original Articles |
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| Authors | Minoru HOSOBA*, Hidenobu WANI*, Michiaki HIROE**, Kiyoko KUSAKABE** |
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| Authors(kana) | |
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| Organization | *Medical Systems Division, Shimadzu Corporation, **Department of Radiology, Tokyo Womens's Medical College |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 21 |
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| Number | 10 |
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| Page | 1229-1236 |
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| Year/Month | 1984/10 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary]A fully automated practical method has been developed to detect the left ventricular (LV) contour from gated pool images. Ejection fraction and volume curve can be computed accurately without operater variance. The characteristics of the method are sum. marized as follows: 1. Optimal design of the filter that works on Fourier domain, can be achieved to improve the signal to noise ratio. 2. New algorithm which use the cosine and sine transform images has been developed for the separating ventricle from atrium and defining center of LV. 3. Contrast enhancement by optimized square filter. 4. Radial profiles are generated from the center of LV and smoothed by fourth order Fourier series approximation. The crossing point with local threshold value searched from the center of the LV is defined as edge. 5. LV contour is obtained by conecting all the edge points defined on radial profiles by fitting them to Fourier function. |
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| Practice | Clinical medicine |
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| Keywords | Automated contour detection, Gated blood pool study, Butterworth filter, SINE, COSINE transform, Fourier filtering. |
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