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首页> 外文期刊>International journal of hyperthermia: The official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group >Could it be advantageous to tune the temperature controller during radiofrequency ablation? A feasibility study using theoretical models
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Could it be advantageous to tune the temperature controller during radiofrequency ablation? A feasibility study using theoretical models

机译：在射频消融过程中调节温度控制器是否有利？使用理论模型的可行性研究

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Purpose: To assess whether tailoring the Kp and Ki values of a proportional-integral (PI) controller during radiofrequency (RF) cardiac ablation could be advantageous from the point of view of the dynamic behaviour of the controller, in particular, whether control action could be speeded up and larger lesions obtained. Methods: Theoretical models were built and solved by the finite element method. RF cardiac ablations were simulated with temperature controlled at 55°C. Specific PI controllers were implemented with Kp and Ki parameters adapted to cases with different tissue values (specific heat, thermal conductivity and electrical conductivity) electrode–tissue contact characteristics (insertion depth, cooling effect of circulating blood) and electrode characteristics (size, location and arrangement of the temperature sensor in the electrode). Results: The lesion dimensions and Tsubmax/sub remained almost unchanged when the specific PI controller was used instead of one tuned for the standard case: Tsubmax/sub varied less than 1.9°C, lesion width less than 0.2?mm, and lesion depth less than 0.3?mm. As expected, we did observe a direct logical relationship between the response time of each controller and the transient value of electrode temperature. Conclusion: The results suggest that a PI controller designed for a standard case (such as that described in this study), could offer benefits under different tissue conditions, electrode–tissue contact, and electrode characteristics.
机译：目的：从控制器的动态行为的角度，尤其是评估控制动作是否可以评估射频（RF）心脏消融期间调整比例积分（PI）控制器的Kp和Ki值是否有利。加快并获得更大的病变。方法：建立了理论模型，并通过有限元法求解。 RF心脏消融的温度控制在55°C。使用具有不同组织值（比热，导热率和电导率），电极-组织接触特性（插入深度，循环血液的冷却效果）和电极特性（大小，位置和大小）的情况的Kp和Ki参数实施特定的PI控制器。温度传感器在电极中的布置）。结果：使用特定的PI控制器代替标准情况下的一种调节时，病变尺寸和T max 几乎保持不变：T max 的变化小于1.9°C，病变宽度小于0.2？mm，病变深度小于0.3？mm。如预期的那样，我们确实观察到每个控制器的响应时间与电极温度的瞬态值之间存在直接的逻辑关系。结论：结果表明，为标准情况设计的PI控制器（如本研究中所述）可在不同的组织条件，电极-组织接触和电极特性下提供益处。

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