The fundamental principle of the CT based on the theory of elastic waveray is briefly introduced, and the key technique of the elastic wave CT is deeply analyzed.
本文首先对弹性波CT基本原理进行简要介绍，然后对弹性波CT关键技术进行较为详细的分析说明。
2
The Fresnel waveray equation is deduced by use of the fundamental equations of crystal optics. The crystal optics question is solved by Fresnel waveray equation cooperating with Maxwell equation.
利用晶体光学基本方程推导出菲涅耳波射线方程，通过波射线方程并结合麦克斯韦方程组求解晶体光学问题。
3
“We still teach students analog X-ray techniques, but the emphasis is on digital radiography,” clinic director Herbert said. “This is the wave of the future.”