Department of Radiology and the Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 138-736, Korea. ; Department of Radiology, Ajou University School of Medicine, Suwon 443-380, Korea.
Department of Radiology and the Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 138-736, Korea.
Korean J Radiol. 2014 Nov-Dec;15(6):836-43. doi: 10.3348/kjr.2014.15.6.836. Epub 2014 Nov 7.
To compare the ablation characteristics of the moving-shot technique (MST) and the fixed electrode technique (FET) for radiofrequency (RF) ablation in an ex-vivo bovine liver tissue model.
We performed RF ablation using FET in 110 bovine liver blocks using 11 different ablation times ranging from 5 seconds to 5 minutes (10 blocks per each time duration). Ten bovine liver blocks at each ablation time of 1- or 2-minute, were ablated with MST, which treated conceptual ablation units by moving the electrode tip. We evaluated the ablation volume obtained with FET across ablation time lengths. The results of FET and MST performed with the same ablation time lengths, i.e., 1- and 2-minute ablation time were also compared.
The ablation volume achieved with FET gradually increased with increasing ablation time; however, the pair-wise statistical comparison between 2 neighboring ablation time lengths was not significant after 30 seconds. MST with either 1- or 2-minute ablation time achieved larger ablation volumes (1.1 ± 0.2 mL vs. 2.7 ± 0.3 mL, p < 0.001; and 1.4 ± 0.2 mL vs. 5.6 ± 0.4 mL, p < 0.001, respectively), longer true RF times (46.7 ± 4.6 seconds vs. 60 seconds, p < 0.001; and 64.8 ± 4.6 seconds vs. 120 seconds, p < 0.001, respectively), fewer numbers of RF cut-offs (1.6 ± 0.5 vs. 0, p < 0.001; and 5.5 ± 0.5 vs. 0, p < 0.001, respectively), and greater energy deposition (2050.16 ± 209.2 J vs. 2677.76 ± 83.68 J, p < 0.001; and 2970.64 ± 376.56 J vs. 5564.72 ± 5439.2 J, p < 0.001, respectively), than FET.
The MST can achieve a larger ablation volume by preventing RF cut-off, compared with the FET in an ex-vivo bovine liver model.
比较移动电极技术（MST）和固定电极技术（FET）在牛离体肝组织模型中用于射频（RF）消融的消融特性。
我们使用 FET 在 110 个牛肝块中进行 RF 消融，消融时间范围为 5 秒至 5 分钟（每个时间间隔 10 个块）。在每个 1 或 2 分钟的消融时间，10 个牛肝块用 MST 进行消融，通过移动电极尖端来处理概念性消融单元。我们评估了 FET 在不同消融时间长度下获得的消融体积。还比较了 FET 和 MST 在相同消融时间长度（即 1 分钟和 2 分钟）下的结果。
随着消融时间的增加，FET 获得的消融体积逐渐增加；然而，在 30 秒后，2 个相邻消融时间长度之间的两两统计比较不显著。使用 1 分钟或 2 分钟消融时间的 MST 获得了更大的消融体积（1.1 ± 0.2 mL 与 2.7 ± 0.3 mL，p < 0.001；1.4 ± 0.2 mL 与 5.6 ± 0.4 mL，p < 0.001），更长的真实 RF 时间（46.7 ± 4.6 秒与 60 秒，p < 0.001；64.8 ± 4.6 秒与 120 秒，p < 0.001），更少的 RF 截止次数（1.6 ± 0.5 与 0，p < 0.001；5.5 ± 0.5 与 0，p < 0.001）和更大的能量沉积（2050.16 ± 209.2 J 与 2677.76 ± 83.68 J，p < 0.001；2970.64 ± 376.56 J 与 5564.72 ± 5439.2 J，p < 0.001），均优于 FET。
在牛离体肝模型中，与 FET 相比，MST 通过防止 RF 截止可实现更大的消融体积。
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