Department of Breast Surgery, The First Affiliated Hospital, Nanjing Medical University, Nanjing, China;Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medicine, School of Public Health, Nanjing Medical University, Nanjing, China.
Department of Breast Surgery, The First Affiliated Hospital, Nanjing Medical University, Nanjing, China;Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Jiangsu Collaborative Innovation Center for Cancer Personalized Medicine, School of Public Health, Nanjing Medical University, Nanjing, China;Department of Breast and Thyroid Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
Diagn Interv Radiol. 2021 May;27(3):418-423. doi: 10.5152/dir.2021.20836.
We aimed to determine the ablation characteristics of discontinuous moving shot technique (DMST) in microwave ablation (MWA), radiofrequency ablation (RFA) and laser ablation (LA), and analyze the differences compared with fixed electrode technique (FET) in an ex vivo porcine liver model.
FET was defined as the ablation needle remaining fixed during ablation. In DMST, ablation needle moved backward for a fixed distance twice along the long axis during ablation. Four moving distances (0.5 cm, 0.75 cm, 1 cm and 2 cm) were used in DMST. Long-axis diameter (LAD) and short-axis diameter (SAD) of ablation zones were measured. The ratio of LAD/SAD was calculated.
The shape and size of ablation zones were different between DMST and FET. Compared with FET, DMST could achieve greater LAD when the moving distance became long enough. In MWA with DMST, SAD decreased with the extension of moving distance and finally became smaller than the SAD in FET. While in LA and RFA, the change of moving distance did not affect SAD significantly.
In MWA, RFA and LA, the characteristics of ablation zone of DMST were different from that of FET. This unique ablation technique may be suitable for conformal thermal ablation.
本研究旨在确定微波消融（MWA）、射频消融（RFA）和激光消融（LA）中不连续移动射束技术（DMST）的消融特性，并与固定电极技术（FET）在离体猪肝模型中的差异进行分析。
FET 定义为消融过程中消融针保持固定。在 DMST 中，在消融过程中，消融针沿长轴向后移动固定距离两次。在 DMST 中使用了四个移动距离（0.5cm、0.75cm、1cm 和 2cm）。测量消融区域的长轴直径（LAD）和短轴直径（SAD），并计算 LAD/SAD 的比值。
DMST 和 FET 之间的消融区域形状和大小不同。与 FET 相比，当移动距离足够长时，DMST 可以实现更大的 LAD。在 DMST 的 MWA 中，随着移动距离的延长，SAD 减小，最终小于 FET 中的 SAD。而在 LA 和 RFA 中，移动距离的变化对 SAD 没有显著影响。
在 MWA、RFA 和 LA 中，DMST 的消融区域特征与 FET 不同。这种独特的消融技术可能适用于适形热消融。
