用相位敏感方法恢复信号极性的T1定量成像
Chinese Journal of Medical Imaging Technology（2007）
Abstract
目的 研究相位敏感方法应用于T1定量测量的可行性及意义.方法 采用相位敏感方法消除相位误差,保存反转恢复序列中磁化矢量的极性.再根据恢复后的图像数据的实部计算得到T1值图像.结果 采用快自旋回波反转恢复序列得到了一组混合加权的幅度及相位图像,对其进行相位敏感校正后再做非线性最小二乘拟合,得到了体模的T1值及人体膝关节的T1图像.结论 通过相位敏感方法保留极性信息的T1定量测量,在反转恢复序列成像中是可行的,并且具有较好的精确度.
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Key words
Magnetic resonance imaging,Phase sensitive method,Polarity restoration,T1-map
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