定量磁化率成像多回波相位拟合算法研究

O482.53; 定量磁化率成像(quantitative susceptibility mapping, QSM)技术大多采用多回波梯度回波序列采集相位数据,经加权最小二乘法(weighted linear least-square,WLS)拟合得到局部磁场分布。对于组织磁化率分布不均匀的区域,尤其是颅底部位,常规WLS算法拟合得到的局部磁场误差较大,导致相应部位磁化率分布图信噪比较低。针对常规WLS算法的这一不足,该文提出了一种截断WLS算法。对两种算法拟合得到的磁化率分布图对比研究发现,截断WLS算法可有效提高颅底部位定量磁化率分布图的图像质量,使其噪声明显下降。...

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Veröffentlicht in:波谱学杂志 2016, Vol.33 (4), p.609-617
Hauptverfasser: 赵欣欣, 薄斌仕, 刘田, 王乙, 李建奇
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container_issue 4
container_start_page 609
container_title 波谱学杂志
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creator 赵欣欣
薄斌仕
刘田
王乙
李建奇
description O482.53; 定量磁化率成像(quantitative susceptibility mapping, QSM)技术大多采用多回波梯度回波序列采集相位数据,经加权最小二乘法(weighted linear least-square,WLS)拟合得到局部磁场分布。对于组织磁化率分布不均匀的区域,尤其是颅底部位,常规WLS算法拟合得到的局部磁场误差较大,导致相应部位磁化率分布图信噪比较低。针对常规WLS算法的这一不足,该文提出了一种截断WLS算法。对两种算法拟合得到的磁化率分布图对比研究发现,截断WLS算法可有效提高颅底部位定量磁化率分布图的图像质量,使其噪声明显下降。
doi_str_mv 10.11938/cjmr20160410
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title 定量磁化率成像多回波相位拟合算法研究
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