【摘要】 生物组织的声速随温度变化明显。利用信号处理技术中的互相关函数分析方法,计算超声散射回波信号的时间延迟。通过分析超声散射回波的时间延迟和组织温度的关系,提取生物组织的温度信息。实验结果表明:当以最高温度时的超声散射回波信号为基准信号时,不同温度时的超声散射回波信号与基准信号的时间延迟随着温度的降低而增大。该种处理方法可有效检测到超声散射回波信号的时间延迟随温度变化的趋势。更多还原

【Abstract】 The sound speed of biological tissue changes with its temperature obviously.It is founded that cross-correlation function is a useful algorithm for detecting time shifts between two back scattered ultrasonic signals.Temperature information in biological tissue can be extracted by using the relationship of the echo-shift and temperature in tissue.It is showed that the trend of echo-shift with temperature can be measured effectively by this signal processing method.For the back scattered ultrasonic signal at the highest temperature being regarded as benchmark,the time shifts between the back scattered ultrasonic signals at varied temperatures and the benchmark signal are largened with temperature falling.更多还原