A FREQUENCY DIVERSITY PROCESS FOR SPECKLE REDUCTION IN REAL-TIME ULTRASONIC IMAGES
A FREQUENCY DIVERSITY PROCESS FOR SPECKLE REDUCTION IN REAL-TIME ULTRASONIC IMAGES
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DOI：
10.1109/58.4146
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发表时间：
1988-01-01
影响因子：
3.6
通讯作者：
THURSTONE, FL
中科院分区：
文献类型：
--
作者：
GALLOWAY, RL;MCDERMOTT, BA;THURSTONE, FL
使用并行处理系统形成了一对并发实时 B 模式图像线。在该系统中，宽带接收回波通过频率分集过程进行划分，并形成单独的图像线。由于它们的组成频率不同，这些图像线具有去相关的散斑图案。对这些过滤后的线进行平均后，所得显示图像中的散斑量就会减少。图像散斑的减少及其伴随的感知分辨率的提高是在不牺牲时间分辨率或实时格式的情况下实现的。通过对包含散斑产生目标的图像进行统计分析，研究滤波器分离和滤波器品质因数 (Q) 的影响。图像信噪比得到了显着改善。<>
A pair of concurrent real-time B-mode image lines has been formed using a parallel processing system. In this system a wideband received echo is partitioned by a frequency diversity process and separate image lines are formed. Due to their differing constituent frequencies, these image lines have decorrelated speckle patterns. Upon averaging these filtered lines, the amount of speckle in the resultant displayed image is reduced. The reduction in image speckle and its accompanying improvement in perceived resolution is accomplished with no sacrifice of temporal resolution or real-time format. The effects of filter separation and filter quality factor (Q) are investigated through statistical analysis of images containing speckle-producing targets. A measurable improvement in image signal-to-noise ratio has been achieved.<>