ArticleMedical physics2019
Evaluation of tissue deformation during radiofrequency and microwave ablation procedures: Influence of output energy delivery.
Article in Medical physics, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04645771 (Safety and Efficacy Study of Endovenous Microwave Ablation for Treatment of Varicose Veins), which is not on this map. Cited by 11 papers.
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The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Safety and Efficacy Study of Endovenous Microwave Ablation for Treatment of Varicose Veins
Who cites it
11 citing papers in PubMed.
- Microwave ablation: a technical and clinical comparison to other thermal ablation modalities to treat benign and malignant thyroid nodules.Gland surgery · 2024Review
- Multi-Probe RFA vs. Single-Probe MWA in an Ex Vivo Bovine Liver Model: Comparison of Volume and Shape of Coagulation Zones.Biology · 2023Article
- A Preliminary Study of Ultrasound-Guided Microwave Ablation for Nonpuerperal Mastitis Treatment.Breast care (Basel, Switzerland) · 2023Article
- Article
- 2450-MHz microwave ablation of liver metastases under 3.0 T wide-bore magnetic resonance guidance: a pilot study.Scientific reports · 2022Article
- Safety and efficacy of microwave versus radiofrequency ablation for large hepatic hemangioma: a multicenter retrospective study with propensity score matching.European radiology · 2022Article
- Direction of Tissue Contraction after Microwave Ablation: A Comparative Experimental Study inKorean journal of radiology · 2022Article
- Microwave ablation of lung tumors: A probabilistic approach for simulation-based treatment planning.Medical physics · 2021Article
- Standardizing percutaneous Microwave Ablation in the treatment of Lung Tumors: a prospective multicenter trial (MALT study).European radiology · 2021Article
- Fat Quantification Imaging and Biophysical Modeling for Patient-Specific Forecasting of Microwave Ablation Therapy.Frontiers in physiology · 2021Article
- Gel Phantom Models for Radiofrequency and Microwave Ablation of the Liver.Digestive disease interventions · 2020Article
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Authors and funding
2 authors.
Funding
Abstract
purposeThe purpose of this study was to quantitatively analyze tissue deformation during radiofrequency (RF) and microwave ablation for varying output energy levels.
methodsA total of 46 fiducial markers which were classified into outer, middle, and inner lines were positioned into a single plane around an RF or microwave ablation applicator in each ex vivo bovine liver sample (8 cm × 6 cm × 4 cm, n = 18). Radiofrequency (500 kHz; ~35 W average) or microwave (2.4 GHz; 50-100 W output, ~35-70 W delivered) ablation was performed for 10 min (n = 4-6 each setting). CT images were acquired over the entire liver volume every 15 s. Principle strain magnitude and direction were determined from fiducial marker displacement. Normal and shear strain were then calculated such that negative strain denoted contraction and positive strain denoted expansion. Temporal variations, the final magnitudes, and angles of the strain were compared across energy delivery settings, using one-way ANOVA with post hoc Tukey's tests.
resultsOn average, tissue strain rates peak at around 1 min and decayed exponentially over time. No evidence of tissue expansion was observed. The tissue strains from RF and 50 W, 75 W, and 100 W microwave ablation at 10 min were -8.5%, -38.9%, -54.4%, and -65.7%, respectively, from the inner region and -3.6%, -23.7%, -41.8%, and -44.3%, respectively, from the outer region. Negative strain magnitude was positively correlated to energy delivery in the inner region (Spearman's
conclusionsThe influence of output energy on tissue deformation during RF and microwave ablation was analyzed. Microwave ablation created significantly greater contraction than RF ablation with similar energy delivery. During microwave ablation, more contraction was noted at higher power levels and in proximity to the antenna. Contraction primarily transverse to the antenna produces ablation zones that are more elongated than the original tissue volume.
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