目的探讨时间-空间标记反转脉冲（Time-SLIP）非对比增强成像技术对正常肾动脉主干和分支显示的可重复性。方法 36名健康志愿者（男16名、女20名,平均年龄21.9岁）均行2次1.5 T Time-SLIP非对比增强肾动脉检查,前后间隔时间约为1~2周。...目的探讨时间-空间标记反转脉冲（Time-SLIP）非对比增强成像技术对正常肾动脉主干和分支显示的可重复性。方法 36名健康志愿者（男16名、女20名,平均年龄21.9岁）均行2次1.5 T Time-SLIP非对比增强肾动脉检查,前后间隔时间约为1~2周。记录前后2次血管-肾脏信号比（VKR）、肾动脉分支级数、图像质量评分、肾动脉主干直径与面积等五个参数,使用Bland-Altman法、测量者组内相关系数（ICC）和测量者间ICC评价可重复性。结果 2名测察者肾动脉分级的ICC分别为0.820和0.908。肾动脉第一段（动脉主干）图像质量评分测量者ICC和测量者间ICC均为1,第二段（肾门区动脉）和第三段（肾实质内动脉）图像质量评分ICC介于0.768~1之间,测量者间ICC介于0.864~0.969之间。双侧肾动脉主干直径和面积的95%LOA介于2.8%~5.6%之间,最小ICC值为0.795,2名测察者间的最小ICC值为0.839。两次检查VKR的95%LOA分别为75%和72.2%,测量者ICC分别为0.510和0.577。结论 Time-SLIP非对比增强成像技术对正常肾动脉主干及其分支的显示具有很高可重复性,在肾动脉病变、肾移植前筛查、肾移植后疗效评估和随访等方面具有重要的意义。展开更多
To study the seismogeny process or the precursory behavior of the 1976 MS=7.0 Lijiang earthquake, we analyze the repeat gravity data with high precision from the Western Yunnan Earthquake Prediction Experiment Area (W...To study the seismogeny process or the precursory behavior of the 1976 MS=7.0 Lijiang earthquake, we analyze the repeat gravity data with high precision from the Western Yunnan Earthquake Prediction Experiment Area (WYEPEA) and the related results of geology and geophysics survey in this paper. Considering the gross errors caused by observation data and model difference, we have firstly inverted the slip distribution of the main active faults with time based on the robust Bayesian least squares estimation and multi-fault dislocation model. The re-sults show that the slip changes of the faults with time from 1990 to 1997 obviously reflect the preparation process of the Lijiang earthquake. The images of main precursor mode have the characteristic of main shock-after shock type, which is agreement to the model of coupling movement between crust density and crust deformation (DD mode of coupling movement).展开更多
基金Joint Seismological Science Foundation of China (101005) and the State Key Basic Research Project (G1998040703).
文摘To study the seismogeny process or the precursory behavior of the 1976 MS=7.0 Lijiang earthquake, we analyze the repeat gravity data with high precision from the Western Yunnan Earthquake Prediction Experiment Area (WYEPEA) and the related results of geology and geophysics survey in this paper. Considering the gross errors caused by observation data and model difference, we have firstly inverted the slip distribution of the main active faults with time based on the robust Bayesian least squares estimation and multi-fault dislocation model. The re-sults show that the slip changes of the faults with time from 1990 to 1997 obviously reflect the preparation process of the Lijiang earthquake. The images of main precursor mode have the characteristic of main shock-after shock type, which is agreement to the model of coupling movement between crust density and crust deformation (DD mode of coupling movement).
