Takook Pegah, Persson Mikael, Gellermann Johanna, Trefná Hana Dobšíček
a Department of Signals and Systems , Chalmers University of Technology , Gothenburg , Sweden.
b Department of Radiation Oncology , University Hospital Tübingen, Germany and Praxis/Zentrum für Strahlentherapie und Radioonkologie , Berlin , Germany.
Int J Hyperthermia. 2017 Jun;33(4):387-400. doi: 10.1080/02656736.2016.1271911. Epub 2017 Jan 8.
Using UWB hyperthermia systems has the potential to improve the heat delivery to deep seated tumours. In this paper, we present a novel self-grounded Bow-Tie antenna design which is to serve as the basis element in a phased-array applicator. The UWB operation in the frequency range of 0.43-1 GHz is achieved by immersing the antenna in a water bolus. The radiation characteristics are improved by appropriate shaping the water bolus and by inclusion of dielectric layers on the top of the radiating arms of the antenna. In order to find the most appropriate design, we use a combination of performance indicators representing the most important attributes of the antenna. These are the UWB impedance matching, the transmission capability and the effective field size. The antenna was constructed and experimentally validated on muscle-like phantom. The measured reflection and transmission coefficients as well as radiation characteristics are in excellent agreement with the simulated results. MR image acquisitions with antenna located inside MR bore indicate a negligible distortion of the images by the antenna itself, which indicates MR compatibility.
使用超宽带热疗系统有可能改善向深部肿瘤传递热量的效果。在本文中，我们提出了一种新型自接地蝴蝶结天线设计，它将作为相控阵辐射器的基础元件。通过将天线浸入水垫中，可在0.43 - 1 GHz频率范围内实现超宽带操作。通过对水垫进行适当塑形以及在天线辐射臂顶部包含介电层，可改善辐射特性。为了找到最合适的设计，我们使用了一组代表天线最重要属性的性能指标。这些指标包括超宽带阻抗匹配、传输能力和有效场大小。该天线已制作完成并在肌肉样体模上进行了实验验证。测量得到的反射和传输系数以及辐射特性与模拟结果非常吻合。在磁共振成像（MR）孔腔内放置天线进行图像采集，结果表明天线本身对图像的失真可忽略不计，这表明该天线具有磁共振兼容性。
