The fundamental principle of the CT based on the theory of elastic wave ray 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。

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The Fresnel wave ray equation is deduced by use of the fundamental equations of crystal optics. The crystal optics question is solved by Fresnel wave ray 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。

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“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.”

“我们也会教学生使用模拟X光技术，但教学重点是数字放射显影术，”诊所主任赫伯特说。“未来化趋势不可阻挡。”

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In the U.S., the TSA uses both types of scanners: 250 X-ray scanners and 264 millimeter wave scanners.

FORBES: Europe Bans Airport Body Scanners For "Health and Safety" Concerns

Instead of X-ray scanners, European airports will use millimeter-wave scanners that utilize low-energy radio waves.

FORBES: Europe Bans Airport Body Scanners For "Health and Safety" Concerns

Ray Valdes, vice-president of web services for tech consultancy Gartner, said that because the new wave of gTLDs went "against the grain of current consumer trends", his company expected most of them to fall short of their goals.

CNN: Scramble for 'dot africa' internet domain name