摘要
B超图象上经常可以看到斑纹(Speckle)状图形,本研究的目的在于弄清超声斑纹图形的产生及其性质,以及它和被检体中的散射体的浓度之间的关系,引出计算浓度d和关系系数a。理论和实验证明了系统的分辨单元的体积内,散射体的个数大于18时,其浓度区域所对应的B超图象不再反映散射体分布,而是斑纹现象占主导地位,这时的浓度区域称做斑纹区域。
A pattern called 'speckle' appears in the B-mode images. The purpose of this paper is to make clear the characteristics of the ultrasonic speckle phenomena. The relationship between the outbreak of the speckle and the scatterers' density is investigated. We have quantitively examined speckle region, where the speckle is in domination and led to the extimated density d and correlation coefficient a. Theoretical and experimental results show that the speckle resion arises when more than about 18 scatterers exist in the volume of the resolution limiting of the system.
出处
《声学学报》
EI
CSCD
北大核心
1990年第6期414-424,共11页
Acta Acustica
