The general theories of gray correction methods for the medical ultrasonic image are introduced in this paper, including gray level correction, gray level transformation and histogram correction.
介绍了超声医学图像灰度校正常用方法的基本原理，这些方法主要有灰度级校正、灰度变换及直方图修正。
Conclusion the brain development in infants can be evaluated with the average values of gray density by echoencephalography and medical image analysis system.
结论可通过脑回声平均灰度值测定，作为临床评价新生儿脑发育的指标，以减少因人为因素导致分析的主观性。
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