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題 名 | Banding Artifacts Along the Frequency-encoding Direction in Multi-echo Magnetic Resonance Imaging: Origin and a Remedy=多迴訊磁振造影中沿頻率編碼方向的條紋狀假影:來源與解決方案 |
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作 者 | 莊子肇; 蔡尚岳; 鍾依林; 周銘鐘; 阮春榮; 鍾孝文; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 24:2 2004.06[民93.06] |
頁 次 | 頁69-75 |
分類號 | 410.1644 |
關鍵詞 | 磁振造影; 多迴訊影像; 激發迴訊; 條紋狀假影; Magnetic resonance imaging; Multi-echo imaging; Stimulated echo; Banding artifacts; |
語 文 | 英文(English) |
中文摘要 | 本文報告一項在標準多迥訊自旋迥訊磁振造影中所發現重複性相當高的假影。在此假影中,嚴重的明暗條紋在所有影像中都沿著頻率編碼方向出現,唯有第一個迥訊的影像皆無。理論分析顯示條紋狀假影係由激發迴訊的破壞性干涉所產生,其起因是因射頻激發脈衝校正準確度不足,並同時存在頻率編碼梯度面積的偏移所共同導致。含水仿體的實驗證實了此項推測。我們並且提出一項解決方案,根據振幅往復式變化的壓碎式梯度,成功消除了上述假影。並且以活體的腦部影像實驗展示其成效。 |
英文摘要 | We report here a highly reproducible artifact seen in standard multi-echo spin-echo imaging, in which severe banding was seen along the frequency-encoding direction for all late echo images, but not for the first echo. A theoretical analysis showed that the banding resulted from the destructive interference effects of the stimulated echo in the presence of both an inaccurate calibration of the RF pulse flip angles and a gradient area offset. Experimental results from a water phantom verified the origin. A remedy method employing crusher gradients with alternating amplitudes was proposed and implemented, which successfully eliminated the artifacts as evidenced by in vivo imaging results from human brain. |
本系統中英文摘要資訊取自各篇刊載內容。