基于独立成分分析的全波核磁共振信号噪声滤除方法研究

被引:30
作者
田宝凤
周媛媛
王悦
李振宇
易晓峰
机构
[1] 吉林大学仪器科学与电气工程学院
关键词
核磁共振; 独立成分分析; 快速固定点算法; 噪声干扰;
D O I
暂无
中图分类号
TB565 [水声仪器与设备];
学科分类号
082403 [水声工程];
摘要
核磁共振测深(MRS)探水仪探测到的纳伏级微弱信号极易受到各种环境噪声的干扰,严重影响信号特征参数的准确提取,导致后续反演解释错误率增高.针对这一难题,提出了基于独立成分分析的快速固定点算法进行信噪分离.首先分析了该算法用于全波MRS信号消噪的适用性;其次,采用数字正交法解决欠定盲源分离问题,提出了频谱校正法实现分离信号幅值的有效恢复.仿真结果表明,该算法能够有效地实现全波MRS信号的信噪分离,且数据拟合后初始振幅和弛豫时间的相对误差小于±5.00%;通过与其他经典算法的对比分析,进一步证明了该算法消噪性能的优越性.将该算法应用到野外实测信号处理,结果证明其能有效滤除环境噪声.
引用
收藏
页码:446 / 457
页数:12
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