超声b扫描成象检测中，由于超声多次反射的影响经常出现伪象，导致检测结果不准确。
In ultrasonic B-scan imaging testing, pseudo-images which lead to inaccurate results can often ap-pear due to the influence of ultrasonic multiple reflections.
研究表明，采用伪随机函数，对分色后的图象文件进行调频加网，再经现有的调幅加网RIP，可实现图象的调频加网输出；
Research results show that by using the pseudo random function and RIP for AM screening, the image of separate color can be input in the form of FM screening.
文中介绍了其测量原理和一些重构图象的算法，并引入广义矢量模式匹配法（GVSPM）和改进的伪逆法求解ECT逆问题。
The principle of the measurement and image reconstruction methods are introduced. GVSPM, an alternative mathematic algorithm, can be used in solving ECT's inverse problem.
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