摘要
本文针对心动周期中心肌超声背向散射积分（ＩＢ）起伏的成因进行了计算机仿真研究。在前人实验数据的基础上，建立了心肌组织超声背向散射的仿真模型，研究了各种可能的因素对ＩＢ取值的影响。初步的研究结果表明，心肌厚度的变化与ＩＢ的变化直接相关，并且此厚度的变化通过使得心肌纤维的几何排列状况与几何尺寸，尤其是心肌纤维的分布密度变化而对ＩＢ起作用。以此为ＩＢ变化的成因，可以解释病理状况下ＩＢ的变化幅度与变化趋势相对于正常情况下的差异，对其它许多实验现象亦可以解释。研究结果表明，心肌厚度变化引起的心肌纤维分布密度以外其它因素的变化也会影响ＩＢ的取值，并且可能是不可忽视的。
A computer simulation study has been carried out to disclose the cause of the fluctuation of ultrasonic integrated backscatter (IB) of myocardium within cardiac cycles. Based on previous experiment data, an ultrasonic backscatter simulation model of myocardial tissues was developed, and the impact of various possible factors on IB has been studied. The preliminary results show that the variation of myocardium thickness is directly relative to the variation of IB, and the impact of the variation of myocardium thickness takes place by changing the geometric arrangement and geometric size, especially distribution density of myocardium fibers. Upon such a result, we are able to explain'the variation of the amplitude and trend of IB fluctuation in pathological cases against that in normal cases, along as many other experimental phenomena. The variation of other factors except myocardium distribution density can also have some effect on IB, and Perhaps their impact can not be ignored, as indicated in our research results.
出处
《声学学报》
EI
CSCD
北大核心
1996年第4期759-765,共7页
Acta Acustica
基金
北京市科学基金
国家自然科学基金
