a Department of Radiology , University of Eulji College of Medicine, Eulji Medical Center , Seoul , Korea.
b Department of Radiology and the Research Institute of Radiology , University of Ulsan College of Medicine, Asan Medical Center , Seoul , Korea.
Int J Hyperthermia. 2018 Aug;34(5):624-630. doi: 10.1080/02656736.2018.1437283. Epub 2018 Feb 19.
This study evaluated the characteristics of a thyroid-dedicated bipolar RF electrode (BRFE) and compared its ablation performance with that of monopolar RF electrodes (MRFEs) in normal bovine liver blocks.
BRFE was tested on 60 bovine liver blocks with six different time-power combinations, applying 20, 30 and 40 W for 60 and 120 s. Subsequently, BRFE and MRFEs with 0.5-, 0.7- and 1-cm active tips were applied on 160 bovine liver blocks, creating 16 time-electrode combinations (10, 30, 60 and 120 s). The ablation characteristics, RF efficacy and true RF efficacy of each electrode group were then evaluated and compared. True RF efficacy was defined as the total ablation volume created within the total time during which valid RF current was generated.
The true RF efficacy of BRFE with 30 W at 60 s was significantly higher than that of BRFE with 20 W and 40 W during the preliminary experiment (p = 0.011). BRFE showed larger vertical and transverse diameters (DT1, DT2) than MRFE with a 0.5-cm active tip (all p values < 0.001, except 10 s). By contrast, MRFE with a 0.7-cm active tip created a larger DT1, DT2, volume, efficacy and true efficacy than BRFE (maximum p value = 0.011). The shape ratio of BRFE was significantly higher than that of MRFEs with 0.5-cm and 0.7-cm tips (all p < 0.001).
Application of BRFE with 30 W could achieve a median ablation volumes and efficacy between that of MRFEs with 0.5-cm and 0.7-cm active tips and created a more ellipsoid-shaped ablation zone.
本研究评估了一款甲状腺专用双极射频电极（BRFE）的特性，并将其与单极射频电极（MRFE）在正常牛肝块中的消融性能进行了比较。
BRFE 在 60 个牛肝块上进行了 6 种不同时间-功率组合的测试，施加 20、30 和 40 W 功率，时间分别为 60 和 120 s。随后，在 160 个牛肝块上应用 BRFE 和 0.5、0.7 和 1 cm 有效尖端的 MRFEs，共创建 16 个电极时间组合（10、30、60 和 120 s）。然后评估和比较了每个电极组的消融特性、射频效果和真实射频效果。真实射频效果定义为在有效射频电流产生的总时间内产生的总消融体积。
初步实验中，BRFE 在 30 W、60 s 时的真实射频效果明显高于 20 W 和 40 W 时的效果（p=0.011）。BRFE 的垂直和横向直径（DT1、DT2）大于 0.5 cm 有效尖端的 MRFE（所有 p 值均<0.001，除 10 s 外）。相比之下，0.7 cm 有效尖端的 MRFE 产生的 DT1、DT2、体积、效果和真实效果均大于 BRFE（最大 p 值=0.011）。BRFE 的形状比为 0.5 cm 和 0.7 cm 有效尖端的 MRFEs 高（所有 p 值均<0.001）。
应用 30 W 的 BRFE 可以实现 MRFEs 中 0.5 cm 和 0.7 cm 有效尖端之间的中位数消融体积和效果，并产生更椭圆形的消融区域。
