3-D Geological Modeling-Concept,Methods and Key Techniques

3-D geological modeling plays an increasingly important role in Petroleum Geology, Mining Geology and Engineering Geology. The complexity of geological conditions requires different modeling methods in different situations. This paper summarizes the general concept of geological modeling; compares the characteristics of borehole-based modeling, cross-section based modeling and multi- source interactive modeling; analyses key techniques in 3-D geological modeling; and highlights the main difficulties and directions of future studies.

MRI联合CEA、CYFRA21-1检测对早期肺癌的诊断价值

目的评价磁共振(MRI)联合癌胚抗原(CEA)、细胞角蛋白19片段(CYFRA21-1)检测在早期肺癌中的临床诊断价值。方法分别对46例早期肺癌患者和88例健康体检者进行MRI扫描、CEA和CYFRA21-1指标检测,并分析比较单项检测和联合检测的灵敏度、特异度、阳性预测值、阴性预测值。结果与MRI、CEA、CYFRA21-1单项检测比较,MRI联合CEA、CYFRA21-1检测能明显提高灵敏度、阴性预测值。结论MRI联合CEA、CYFRA21-1检测可提高早期肺癌诊断的诊断效能。