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首页> 外文会议>International Conference on Quality in Research >Design of ultrawideband applicator for microwave ablation aimed at thermal therapy in liver cancer
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Design of ultrawideband applicator for microwave ablation aimed at thermal therapy in liver cancer

机译：用于微波消融的超空手带涂抹器设计针对肝癌热疗的热处理

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Thermal ablation is conducted by utilizing temperature changes to destroy the abnormal tissue or restore its function. The latest technique in thermal ablation is Microwave Ablation (MW Ablation) that rely on the propagation of electromagnetic waves that is able to increase the temperature of a tissue rapidly. Changes in temperature during the ablation process will reduce the water content in the body tissue (78% of the liver tissue is composed of water) and affect the value of permittivity and conductivity of the tissue. These changes cause the impedance matching of the antenna applicator also change during the ablation process. The change on impedance will make the system does not match with the previous resonant frequency. In addition, the microwave ablation applicator, which is designed for specific frequencies (2.4 GHz and 915MHz) with narrow band characteristics will be suffered from aforementioned phenomenon. Meanwhile, according to the previous studies there are other prominent resonant frequencies that used for MW Ablation, i.e. 1.9 GHz, 6 GHz, 9.2 GHz and 10 GHz. Therefore to accommodate some of the frequencies that are widely used in microwave ablation technique and to tackle the problems arising from the reduced transmission efficiency, then an applicator that has ultrawideband (UWB) characteristics is proposed. In this paper, we design an applicator, which has the characteristics of UWB by modifying the ground plane of the applicator by a hexagonal-sectioned coil. The applicator is designed on a FR4 substrate and numerically simulated with liver phantom by using CST Microwave Studio. The proposed applicator is able to have wide bandwidth by 8.1 GHz, with lower frequency (fl) 1.84 GHz and higher frequency (fh) 10 GHz.
机译：热消融，通过利用温度变化以破坏异常组织或恢复其功能进行的。在热消融的最新技术是微波消融（MW消融）依赖于电磁波的传播，能够以增加组织的温度迅速。在消融过程中的温度变化会降低在身体组织（肝组织的78 ％由水组成）中的水含量，影响的组织的介电常数和电导率的值。这些变化会导致天线施加器的阻抗匹配在消融过程期间也变化。通阻抗的变化会使系统不匹配，与以前的共振频率。此外，微波消融施加器，其被设计成用于特定的频率（2.4GHz和915MHz的）与窄带特性将从上述​​现象被受到影响。同时，根据以往的研究还有其他突出的谐振频率与用于MW消融，即1.9千兆赫，6千兆赫，9.2 GHz和10千兆赫。因此，以适应一些被广泛用于微波消融技术，并解决从降低传输效率而产生的问题的频率，然后，其具有超宽带（UWB）的特性的施用提出。在本文中，我们设计施放器，其通过由六边形截面的线圈修改涂抹器的接地平面具有UWB的特性。涂抹器被设计成FR4基板上，并通过使用CST微波工作室与肝幻象数值模拟。所提出的施用器能够通过8.1 GHz到具有宽的带宽，具有较低频率（f <子>升）1.84 GHz和更高频率（f <子>ħ）10千兆赫。

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