胆结石超声性质的离体研究

本文使用脉冲插入取代法,在1MHz频率下,对25个离体胆结石的声学参数,如声速、声衰减等进行了测量。结果表明,声速值分布很宽,从1688.8m/s到2414.5m/s,且声速值C_s(m/s)随胆石厚度D(mm)增加而趋于减小,其变化关系可由拟合方程C_s=3382.2×D~(-0.30)予以描述(r=0.92)。胆石的超声衰减值很高,从21.6dB/cm到107.2dB/cm。对于不同化学组份类型的胆结石,未发现它们的声学参数有明显不同。由此可认为,胆石的声学参数主要决定于其结构,而不是其化学组份。对所获结果的意义结合超声临床应用进行了讨论。

Study on Ultrasonic Properties of Human Gallstones in vitro

The acoustic parameters, such as sound speed, attenuation coefficient, etc. for 25 human gallstones in vitro were measured at frequency of 1 MHz by using the pulse insertion substitution method. The obtained results show that the speed is widely dispersed from 1688.8m/s to 2414.5m/s, and the value of speed, Cs(m/s), tends to decrease with the increase of the gallstone thickness, D(mm), which can be described by the regression equation Cs= 3382.2 D-0.30 m/s (correlation coefficient r=0.92). The value of sound attenuation of gallstones was found to be very high, ranging from 21.6 dB/cm to 107.8dB/cm. No distinct difference in acoustic parameters was observed for different constituent categories of the gallstones. The significance of these findings has been discussed along with the application of ultrasound in clinical medicine.