| 朱海涛,俎中良,周堃,俞燕明,高嵩,包尚联.用相位敏感方法恢复信号极性的T1定量成像[J].中国医学影像技术,2007,23(9):1397~1401 |
| 用相位敏感方法恢复信号极性的T1定量成像 |
| T1 mapping with polarity restoration by phase sensitive method |
| 投稿时间：2007-02-25 修订日期：2007-04-23 |
| DOI： |
| 中文关键词: 磁共振成像 T1-map 极性恢复 相位敏感方法 |
| 英文关键词:Magnetic resonance imaging T1-map Polarity restoration Phase sensitive method |
| 基金项目:国家自然科学基金科学仪器专项(10527003)和面上项目(60672104),北京市教委共建项目(JD100010607),国家973项目(2006CB70570005),北京市自然科学基金项目(3073019)和科技部科学仪器升级改造专项(2006JG1000)。 |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Objective To research on the feasibility and significance of the phase sensitive method in quantitive T1 measurement. Methods The phase sensitive method was used to remove the phase errors and restore the polarity of the inversion recovery data. Then the T1 values were calculated by the real part of the complex data in polarity restored images. Results A series of magnitude and phase images were collected by FSE-IR sequence, and the polarity information was restored using the phase sensitive method. T1 values of phantoms and T1-map of a volunteer's knee were obtained by least square fitting. Conclusion The phase sensitive method is feasible for polarity restoration in T1 mapping using IR sequence, and it shows good accuracy. |
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