利用动态热图像研究冷水刺激后手指的温度变化

Experimental Analysis of Temperature Variation in Fingertips after Cold Water Stimulation Using Dynamic Thermography

目的考察不同强度冷水刺激下,手指温度变化与血流的关系。方法使用红外热像仪拍摄被测者手指在受到不同温度冷水刺激前后的动态红外热图像,并用多普勒血流仪检测刺激前后指尖血流量的变化。运用图像处理技术提取红外热图像序列中各个指尖和掌心的温度信息。建立数学模型模拟手指受到冷刺激后的温度变化。结果手指受到冷水刺激后,其指尖温度产生非正常的波动,未受刺激的手指也出现类似波动,但各手指的温度波动周期与血流脉动周期不同。模型计算结果与实验结果基本相符。结论本文开发的动态热图像处理算法,能够准确提取目标部位的信息,其应用具有普遍性;建立的关于神经调节和温度变化的整合模型,证实了血管收缩神经的周期性调节是引起手指温度波动的重要因素。

Objective To investigate the relationship between peripheral temperature variation and blood flow after various cold water stimulations. Methods Dynamic thermography and ultrasound Doppler flowmetry were used to measure the temperature and blood flow variation in fingertips respectively after cold water stimulation. Information in target parts of fingertips and palm center was extracted with automatic analysis technique. A modeling study was established to simulate the temperature variation in fingertips. Results After cold water stimulation in some special fingers, temperature oscillation appeared in all fingertips. However, the periodical temperature fluctuation did not agree with the blood pulse cycle. The calculation results was in accordance with the experimental results. Conclusion By using the image processing method, information of the target parts can be extracted automatically and exactly. The integrated model which consider neuromodulation and temperature variation has indicated that periodic control of vasoconstrictor is important for regulating fingertip temperature.