生物体组织的超声等效材料

The Trial-produce of Ultrasonic Tissue Phantom

组织超声等效材料是目前国内外医用超声领域的热门课题。由于离体生物组织有许多局限性,生物组织超声模型因此成为这项研究中必不可少的工具。本文作者研制出一种生物组织超声模型的配制方法。这种方法可任意调节样品的衰减系数、声速和散射系数来模拟诸如肌肉、脂肪、肝脏、肿瘤等组织,用此方法做出模型的B超图象与临床肝组织、脂肪、肿瘤等具有良好的相似性。

With the widely use of B-mode ultrasound diagnosis, the research on the technique of B-scanner and B-scan images has become more and more important. Because of the difficulty of obtainingand preserving bio-tissue and the variation of its ultrasonic character, ultrasonic tissue phantom has become an important tool in the research.In this paper, a new method to make ultrasonic tissue phantom is described. A kind of plant glueagar is used as basic material because its ultrasonic character is similar to that of water. The shape of agar can be easily molded under temperature control. Since the ultrasonic attenuation of agar is nearly zero, some different kinds of powder such as aluminium, carbon, silica and wood are added into agar to adjust the attenuation and backscattering of the phantom. It shows that silica powder with particle diameter of 76μm can be used to change the ultrasonic attenuation of phantom while aluminium powder with particle diameter of 125μm can adjust the backscattering and carbon powder with particle diameter of 90μm can variate both the ultrasonic attenuation and backscattering of phantom. Wood powder can be used to make a tissue phantom with large ultrasonic attenuation.The velocity of phantom is adjusted by changing the content of sugar and salt. The results show that sugar can variate the velocity of phantom from 1500 m/s to 1900m/s while salt from 1500m/s to 1700m/s.The phantom can be made to simulate muscle, fat, liver, tumor, cancer, etc, the B-scan images of these phantoms are very similar to clinical ones.