Microwave ablation (MWA) is relatively safe and efficient treatment method for the patients suffering with liver tumors. The antenna is integral part of the MWA setup. The optimized design of antenna play important role in investigating the effectiveness of MWA therapy. Tapered Cap Floating Sleeve Antenna was simulated, designed and optimized to treat the malignant liver tumors. The strength of tapered cap floating sleeve facilitates the antenna to be inserted into the liver tissue without requiring any insertion device. The tapered cap length was optimized at 5 mm having base diameter of .25 mm at an angle of 280 where the antenna resonated at the operating frequency of 2.45 GHz. Tapered cap floating sleeve antenna is able to generate perfectly spherical ablation zone at the tip without increasing the radial dimensions of the antenna. The SAR patterns were obtained at different insertion depth and it has been observed that the SAR distributions were unaffected by the insertion depth.
Malignant liver tumors are the sixth most common and deadly cancer in the world and the third most common cause of cancer mortality. Hepatocellular carcinoma (primary liver cancer) is one of the most common malignancies worldwide with one of the highest mortality rates. Microwave ablation (MWA) is a new, promising, and multidisciplinary technology designed to destroy unhealthy tissue of various natures by radiating electromagnetic waves with microwave antennas. The finite element method (FEM) has been used in the present work to generate the simulated models of tapered cap floating sleeve antenna for validation of its design concepts, because FEM allows modeling of complex geometries that cannot be solved by analytical methods or finite difference models. The performances have been evaluated in terms of objective metrics, ablation zone, antenna matching, power absorption and SAR pattern.
In this article, new interstitial antenna operating at a frequency of 2.45 GHz for the treatment of hepatocellular carcinoma (HCC) using microwave ablation has been investigated. This antenna is basically an asymmetrical miniaturized choke dipole antenna with a pointed needle at the tip. A commercial finite element method (FEM) package, COMSOL Multiphysics 3.4a, has been used to simulate the performance of needle tip choke antenna. The performance of the antenna has been evaluated numerically, taking into account the specific absorption rate, antenna impedance matching and geometry of the obtained thermal lesion, and the temperature distribution plot obtained shows that maximum temperature was attained in this simulation. The antenna is also capable of creating a spherical-shaped ablation zone. The size and shape of the ablation zone can be slightly adjusted by adjusting the choke position in order to maintain spherical ablation zones.
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