Simultaneous microwave ablation using multiple antennas in explanted bovine livers: relationship between ablative zone and antenna
- 1 August 2008
- journal article
- Published by Springer Science and Business Media LLC in Radiation Medicine
- Vol. 26 (7), 408-414
- https://doi.org/10.1007/s11604-008-0251-x
Abstract
Our purpose was to determine the optimal antenna spacing to achieve large ablative zones without indentations when microwave ablation is performed with simultaneous activation of two or three antennas. Microwave ablation was performed with single-antenna activation and simultaneous activation of two or three antennas with a spacing of 1.5, 2.0, 2.5, or 3.0 cm in explanted bovine livers. Microwave energy was applied for 10 min with a power of 45 W. The shapes and sizes of the ablative zones created were recorded and compared. The shape of the ablative zone was ellipsoid in the axial plane (along the antenna axis) and spherical in the transverse plane (perpendicular to the antenna axis) in single-antenna ablation. The ablative zones were spherical or ellipsoid in both the axial and transverse planes in two-and three-antenna ablation with an antenna spacing of 2.0 cm or less. Indentations were observed between the ablative zones created by the antennas when the spacing was 2.5 cm or more, reducing the minimum transverse diameter. When two-or three-antenna ablation was performed with a spacing of 2.0 cm or less, the axial and minimum transverse diameters were significantly larger than in single-antenna ablation. The largest volume (almost two or three times the single-activation volume) was achieved in two-or three-antenna ablation with an antenna spacing of 2.0 cm. We found that simultaneous microwave ablation using multiple microwave antennas creates large ablative zones without indentations when multiple antennas are activated with an antenna spacing of 2.0 cm or less.Keywords
This publication has 22 references indexed in Scilit:
- Microwave Ablation with a Single Small-Gauge Triaxial Antenna: In Vivo Porcine Liver ModelRadiology, 2007
- Experimental and Clinical Radiofrequency Ablation: Proposal for Standardized Description of Coagulation Size and GeometryAnnals of Surgical Oncology, 2007
- Thermal ablation therapy for hepatocellular carcinoma: comparison between radiofrequency ablation and percutaneous microwave coagulation therapy.2006
- Microwave Ablation: Principles and ApplicationsRadioGraphics, 2005
- Radiofrequency versus Microwave Ablation in a Hepatic Porcine ModelRadiology, 2005
- Image-guided Tumor Ablation: Standardization of Terminology and Reporting CriteriaRadiology, 2005
- Prognostic Factors for Survival in Patients with Hepatocellular Carcinoma after Percutaneous Microwave AblationRadiology, 2005
- Small Hepatocellular Carcinoma: Comparison of Radio-frequency Ablation and Percutaneous Microwave Coagulation TherapyRadiology, 2002
- Comparison of the effects of in-vivo thermal ablation of pig liver by microwave and radiofrequency coagulationJournal of Hepato-Biliary-Pancreatic Surgery, 2000
- Ultrasonically guided percutaneous microwave coagulation therapy for small hepatocellular carcinomaCancer, 1994