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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？使用理论模型进行可行性研究。

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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 degrees 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 T(max) remained almost unchanged when the specific PI controller was used instead of one tuned for the standard case: T(max) varied less than 1.9 degrees 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：从射频控制器的动态行为的角度，评估在射频（RF）心脏消融期间调整比例积分（PI）控制器的Kp和Ki值是否有优势，特别是控制动作是否可以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心脏消融在温度控制在55摄氏度的情况下进行模拟。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，冷却）的Kp和Ki参数实施特定的PI控制器血液循环的影响）和电极特性（电极中温度传感器的尺寸，位置和布置）。结果：当使用特定的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）变化小于1.9摄氏度，病变宽度小于0.2 mm，病变深度小于0.3毫米。不出所料，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（如本研究中所述）设计的PI控制器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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