彩色多普勒示返流及分流束的面积和周长均增加。
The color Doppler jet area and circumference of all jets were also increased.
利用本算法，图像面积和周长的计算误差最大不超过2 % 。
Using this algorithm, the computation error of image area and girth is less than 2 percents.
区域面积和周长是图像分析与识别过程中所需的两个重要参数。
The area and perimeter of the closed region are two important parameters for image analysis and recognition.
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