| 磁敏感加权脑静脉成像中的磁场不均匀性伪影滤除技术 |
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| 引用本文： | 窦菲菲,许建荣,王成,程杰军,张剑戈,锁时.磁敏感加权脑静脉成像中的磁场不均匀性伪影滤除技术[J].中国生物医学工程学报,2010,29(1). |
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| 作者姓名： | 窦菲菲 许建荣 王成 程杰军 张剑戈 锁时 |
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| 作者单位： | 1. 上海交通大学医学院生物医学工程系,上海,200025
2. 上海交通大学医学院附属仁济医院,上海,200025 |
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| 基金项目： | 上海交通大学仁济医院-基础医学院合作研究基金项目 |
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| 摘 要： | 针对磁敏感加权法(SWI)在脑静脉成像中存在高频磁场不均匀性伪影的问题,提出一种新的基于伪影滤除技术的磁敏感加权法(BER-SWI)。在原始SWI的窗函数法将低频的磁场不均匀性伪影滤除的基础上,将图像按像素值分为特定的区段,通过区域平均边界差,检测出发生2π跳变的伪影区域,再用区域生长法完全生长出此区域的伪影,并将其滤除。结果表明,BER-SWI很好地解决了原始SWI无法去除颅底部的高频磁场不均匀性伪影的问题,得到了更加准确、清晰的磁敏感加权图。
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| 关 键 词： | 磁敏感加权成像 磁场不均匀性 伪影 磁共振静脉成像 |
Removing the Field Inhomogeneity Background Effects in the SWI Based Brain Venography |
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| DOU Fei-Fei,XU Jian-Rong,WANG Cheng,CHENG Jie-Jun,ZHANG Jian-Ge,SUO Shi.Removing the Field Inhomogeneity Background Effects in the SWI Based Brain Venography[J].Chinese Journal of Biomedical Engineering,2010,29(1). |
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| Authors: | DOU Fei-Fei XU Jian-Rong WANG Cheng CHENG Jie-Jun ZHANG Jian-Ge SUO Shi |
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| Affiliation: | DOU Fei-Fei~1 XU Jian-Rong~2 WANG Cheng~(1*) CHENG Jie-Jun~2 ZHANG Jian-Ge~1 SUO Shi~1()~1(Department of Biomedical Engineering,Medical School of Shanghai Jiaotong University,Shanghai 200025,China)()~2(Renji Hospital Affiliated to Medical School of Shanghai Jiaotong University,China) |
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| Abstract: | To the problem of background effects caused by the high frequency field inhomogeneity existing in the original susceptibility weighted imaging(SWI),this paper introduced a revised method named as background-effects-removing susceptibility weighted imaging(BER-SWI).On the basis of removing the low frequency field inhomogeneities using the window function in the original SWI,the new method employed several steps to achieve a better result.Firstly,the image was divided into specified regions according to the v... |
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| Keywords: | susceptibility weighted imaging field inhomogeneity background effects MR venography |
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