模糊控制在射频消融温度与阻抗监测系统中的应用

Application of fuzzy control in radiofrequency ablation temperature and impedance monitoring system

为了提高射频消融系统中肿瘤组织温度和阻抗的控制精度,设计了基于模糊控制的温度与阻抗监测系统。系统采用光纤光栅温度传感器测量组织温度,运用电阻采样、互感器隔离的方式测量组织阻抗;选用模糊控制算法对温度和阻抗进行控制,并通过建立分层多规则集结构模糊控制器,降低了控制复杂度。经过实验验证,治疗温度上升速度快、过渡时间短,最大超调量为1℃,稳态精度为±0.4℃,控制算法适应性强,可以实现对肿瘤组织均匀、平稳的加热治疗,对临床治疗肿瘤具有较高的实用价值。

In order to improve the control accuracy of temperature and impedance of tumor tissue in radiofrequency ablation system,a temperature and impedance monitoring system based on fuzzy control was designed.Fiber grating temperature sensor was used to measure tissue temperature and resistance sampling and transformer isolation were used to measure tissue impedance.The fuzzy control algorithm was adopted to control the temperature and impedance and the hierarchical multi-rule structure fuzzy controller was established to reduce the control complexity.The experimental results show that the treatment temperature rises rapidly,the transition time is short,the maximum overshoot is 1℃and the steady-state accuracy is±0.4℃.The control algorithm has strong adaptability,achieve homogeneous and stable heating treatment of tumor tissue and has high practical value for clinical treatment of tumor.