介绍了三维CT（计算机层析成像）成像的原理，给出了针对航空发动机涡轮叶片这种异形结构的多模式重建算法，进行了航空发动机涡轮叶片的三维CT检测试验。结果表明：三维工业CT技术能从多个方位表征叶片内部的裂纹、气孔、夹杂等缺陷，比胶片射线照相更加直观、全面，值得推广。

An introduction is made on the theory of three-dimensional CT imaging, and a reconstruction algorithm for the abnormal structure such as aero-engine turbine blade is given. Researches on the three-dimensional CT gas turbine engine test were carried out. Results show that the 3D industrial CT technology can characterize the internal cracks, such as porosity, inclusions and other defects from multiple azimuths, resulting in more direct and more complete viewing of the defects than film radiography, and is worthy of promotion.