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Evaluation of the Feasibility, Safety, and Accuracy of an Intraoperative High-intensity Focused Ultrasound Device for Treating Liver Metastases
Published on: January 9, 2019
Radio-frequency ablation in a realistic reconstructed hepatic tissue
Prasanna Hariharan1, Isaac Chang, Matthew R Myers
1Mechanical Engineering Department, University of Cincinnati, 688 Rhodes Hall, P.O. Box 210072, Cincinnati, OH 45221-0072, USA.
Journal of Biomechanical Engineering
|June 1, 2007
Summary
Realistic vascular geometry significantly impacts radiofrequency (RF) tumor ablation. Blood flow in arteries cools tissue, potentially reducing thermal dose and risking incomplete tumor destruction.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Computational Fluid Dynamics
Background:
- Radiofrequency (RF) tumor ablation is a common cancer treatment.
- Accurate modeling of thermal response is crucial for effective ablation.
- Vascular geometry significantly influences heat distribution in tissues.
Purpose of the Study:
- To evaluate the thermal response of liver tissue during 3D RF tumor ablation.
- To investigate the impact of reconstructed vascular geometry on ablation outcomes.
- To analyze the role of convective cooling by blood flow in RF ablation.
Main Methods:
- Utilized MRI images to reconstruct 3D vascular geometry of liver tissue.
- Developed a finite-element mesh incorporating arterial vessels.
- Modeled RF heat source and convective cooling within blood vessels.
- Calculated temperature rise and thermal dose for various tumor locations.
Main Results:
- Tissue temperature profiles showed significant dependence on vascular geometry and tumor location.
- Arterial heat convection reduced steady-state temperature rise by up to 70%.
- Blood flow decreased thermal dose from 3600 min to 10 min, potentially below therapeutic thresholds.
- Vascular tortuosity, unique to each patient, influences ablation effectiveness.
Conclusions:
- Patient-specific vascular geometry reconstruction is essential for accurate RF ablation modeling.
- Inadequate thermal dose due to blood flow can lead to incomplete tumor ablation and recurrence.
- Computational modeling of realistic vasculature can optimize RF ablation strategies.
