Temperature simulation of microwave ablation based on improved specific absorption rate method compared to phantom measurements. (31st October 2017)

• Record Type: Journal Article
• Authors: Gao, Hongjian; Wu, Shuicai; Wang, Xiaoru; Hu, Rui; Zhou, Zhuhuang; Sun, Xuecong
• Is Part Of: Computer assisted surgery. Volume 22(2017)Supplement 1
• Page Start: 9
• Page End: 17
• Publication Date: 2017-10-31
• Subjects: Microwave ablation -- specific absorptionrate -- temperature distribution simulation; Computer-assisted surgery -- Periodicals
• DOI: 10.1080/24699322.2017.1378605
• Languages: English
• ISSNs: 2469-9322

Abstract

Abstract: Purpose : To propose an improved specific absorption rate (SAR) computation method by incorporating a thermal conductivity item, develop mathematical simulation models based on the SAR, and enhance the accuracy of temperature simulation for 2450-MHz microwave fields. Materials and methods : Experimental data of 2450-MHz microwave antenna were obtained with a phantom and then new SAR equations were calculated according to Pennes bio-heat transfer equation. Next, the SAR equations were regarded as heating sources and SAR-derived temperature changes were simulated numerically; Finally, temperature measurement results were compared with simulation data to validate the accuracy of the new SAR method. Results : The simulated and measured temperature changes were generally in good agreement for the phantom. According to comparison results, the maximum error was less than 6 °C, the average error was less than 2 °C, and the standard deviation was less than 1 °C. Conclusions : This new SAR-derived simulation method can significantly simplify the simulation process and improve the prediction accuracy of microwave ablation temperature field.