PDF(Pubmed)
Abstract：
This study presents a measurement principle for determining the size of the ablation zone in MWA, which could ultimately form an alternative to more expensive monitoring approaches like CT. The measurement method is based on a microwave transmission measurement. A MWA is performed experimentally on ex vivo bovine liver to determine the ablation zone. This setup uses a custom slot applicator performing the MWA at an operating frequency of 2.45 GHz and a custom bowtie antenna measuring the waves transmitted from the applicator. Furthermore, a custom measurement probe is used to determine the dielectric properties. A time-shift analysis is used to determine the radial extent of the ablation zone. Several measurements are carried out with a power of 50 W for 10 min to show the reproducibility. The results show that this method can provide reproducible outcomes to determine the ablation zone with a maximum error of 4.11%.
摘要：
本研究提出了一种用于确定MWA中消融区大小的测量原理，最终可以替代更昂贵的监测方法，如CT。测量方法基于微波传输测量。在离体牛肝上进行MWA实验以确定消融区。该设置使用在2.45GHz的工作频率下执行MWA的定制槽施加器和测量从施加器发射的波的定制蝴蝶结天线。此外，使用自定义测量探针来确定介电特性。使用时移分析来确定消融区的径向范围。以50W的功率进行10分钟的多次测量以显示再现性。结果表明，该方法可以提供可重复的结果来确定消融区，最大误差为4.11％。
