Department of Radiology, University of Cologne, Joseph-Stelzmann-Str. 9, 50931, Cologne, Germany.
Eur Radiol. 2010 May;20(5):1073-8. doi: 10.1007/s00330-009-1639-4. Epub 2009 Nov 14.
To compare two-dimensional (2D) and three-dimensional (3D) computed tomography (CT) measurements of ablation zones (AZs) related to the shaft of two different large-volume monopolar multi-tined expandable electrodes.
Percutaneous radiofrequency (RF) ablation was performed in 12 pigs (81.6 +/- 7.8 kg) using two electrodes (LeVeen 5 cm, Rita XL 5 cm; n = 6 in each group). Contrast-enhanced CT with the electrode shaft in place evaluated the AZ. The largest sphere centred on the electrode shaft within the AZ was calculated (1) based on the 2D axial CT image in the plane of the shaft assuming rotational symmetry of the AZ and (2) using prototype software and the 3D volume data of the AZ measured with CT.
The mean largest diameter of a sphere centred on the electrode shaft was always smaller using the 3D data of the AZ than using 2D CT measurements assuming rotational symmetry of the AZ (3D vs 2D): LeVeen 18.2 +/- 4.8 mm; 24.5 +/- 3.1 mm; p = 0.001; Rita XL 20.0 +/- 3.7 mm; 28.8 +/- 4.9 mm; p = 0.0002. All AZ showed indentations around the tines.
Two-dimensional CT measurements assuming rotational symmetry of the AZ overestimate the largest ablated sphere centred on the electrode shaft compared with 3D CT measurements.
比较两种不同大容量单极多齿可膨胀电极轴相关消融区（AZ）的二维（2D）和三维（3D）计算机断层扫描（CT）测量。
在 12 头猪（81.6 ± 7.8kg）中使用两种电极（LeVeen 5cm，Rita XL 5cm；每组 n = 6）进行经皮射频（RF）消融。带有电极轴的对比增强 CT 评估 AZ。在 AZ 内，在电极轴所在的平面上计算出基于假设 AZ 旋转对称的 2D 轴向 CT 图像的最大球形（1），以及使用原型软件和 CT 测量的 AZ 的 3D 体积数据的最大球形（2）。
基于假设 AZ 旋转对称的 2D CT 测量的情况下，以电极轴为中心的最大球形直径始终小于使用 AZ 的 3D 数据（3D 与 2D 相比）：LeVeen 18.2 ± 4.8mm；24.5 ± 3.1mm；p = 0.001；Rita XL 20.0 ± 3.7mm；28.8 ± 4.9mm；p = 0.0002。所有 AZ 均在齿周围出现凹陷。
与 3D CT 测量相比，基于假设 AZ 旋转对称的 2D CT 测量高估了以电极轴为中心的最大消融球形。
