B型超声诊断图像中肿瘤后方的声场分布

本文分析了B型超声诊断图像中肿块后方的增强、阴影和侧后声影带等图像特征。分析中把肿块简化为圆柱,运用射线声学的方法,导出了脉冲入射情况下肿块后方组织的散射回波声压公式。考虑了组织的声衰减和仪器的时间增益补偿的影响,我们用计算机绘出给定参量的回声图像,又用组织仿体进行了定性的实验验证。理论和实验结果定性相符。

Acoustic field distribution posterior to a tumor in B-Mode diagnostic ulrasonography

The image characteristics, such as enhancements, shadows and lateral shadows, posterior to a tumor in a B-Mode diagnostic ultrasongraphy, are studied. The tumor is simplified as a homogeneous cylinder in an inhomogeneous medium. With a ray method, we derive an intensity formula for the region behind the cylinder. Then, considering the influence of sound attenuation and that of the time gain compensation of the B-Mode displayer, we simulate five images with a computer, which correspond to our experiments conducted with a tissue-equivalent phantom. The theoretical images seem to be in good qualitative consistency with the experimental results.