论文部分内容阅读
生物组织中超声散射回波的平均功率与其温度有关．该理论包含：（１）生物组织近似为离散随机介质．（２）离散随机介质的平均散射功率与组织的衰减系数α和声速Ｃ有关。对于似水生物组织（如：猪肝），当温度升高时，衰减系数的减小使平均散射声功率增加，但其影响大小与时间窗△ｔ有关，而声速的增大则使平均散射声功率减小。实验结果表明：生物组织的平均散射声功率随温度变化趋势明显，该结果提供一种肿瘤热疗无损伤检测温度的新方法。
The average power of ultrasound scattered echoes in biological tissue is related to its temperature. The theory includes: (1) The biological tissue is approximately a discrete random medium. (2) The average scattering power of discrete random media is related to the tissue attenuation coefficient α and the sound velocity C. For water-like organisms (such as pig liver), when the temperature rises, the decrease of the attenuation coefficient increases the average scatter sound power, but its effect size is related to the time window Δt, and the increase of the sound speed causes the average scatter. The sound power is reduced. The experimental results show that the average scatter sound power of biological tissue changes significantly with temperature. This result provides a new method for detecting temperature without damage in hyperthermia.