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Thermo ablation

Ricardo Possebon, Yansheng Jiang, Stefaan Mulier, Chong Wang, Feng Chen, Yuanbo Feng, Yicheng Ni
Radiofrequency ablation (RFA) is a widely used thermal treatment for liver tumors. Knowledge about the resistivity of liver is a prerequisite for the predictability of producible thermo-necrosis with RFA. Most research to date has focused on performing specific experiments to determine the resistivity of a given liver. This work aims to determine the resistivity from the time course of impedance obtained in RFA. We assume that the liver resistivity obeys a piecewise function of temperature. We determine in this work the means and standard derivations of parameters in the resistivity function with finite element analysis of ex vivo bipolar RFA...
August 2, 2017: Medical & Biological Engineering & Computing
Qunfang Zhou, Songsong Wu, Ningqiang Gong, Xin Li, Jianping Dou, Mengjuan Mu, Xiaoling Yu, Jie Yu, Ping Liang
Microwave ablation (MWA) is a promising minimally invasive therapy that has been widely used to treat hepatocellular carcinoma (HCC). However, the efficiency of MWA in treating HCC is evidently limited by the incomplete ablation of large tumors and tumors in high-risk locations. Here, we report the value of using liposomes packed with sodium chloride (NaCl-LPs) as effective thermo-seeds for MWA of HCC. The prepared liposomes exhibited excellent heat conversion ability by showing a more rapid temperature increase than free NaCl medium, blank liposomes or water under microwave irradiation...
July 25, 2017: Nanoscale
Dan Long, Meng Niu, Longfei Tan, Changhui Fu, Xiangling Ren, Ke Xu, Hongshan Zhong, Jingzhuo Wang, Laifeng Li, Xianwei Meng
Combined thermo-chemotherapy displays outstanding synergically therapeutic efficiency when compared with standalone thermotherapy and chemotherapy. Herein, we developed a smart tri-stimuli-responsive drug delivery system involving X@BB-ZrO2 NPs (X represents loaded IL, DOX, keratin and tetradecanol) based on novel ball-in-ball-structured ZrO2 nanoparticles (BB-ZrO2 NPs). The microwave energy conversion efficiency of BB-ZrO2 NPs was 41.2% higher than that of traditional single-layer NPs due to the cooperative action of self-reflection and spatial confinement effect of the special two-layer hollow nanostructure...
June 29, 2017: Nanoscale
Daniel Christidis, Shannon McGrath, Marlon Perera, Todd Manning, Damien Bolton, Nathan Lawrentschuk
The prevalence of benign prostatic hypertrophy (BPH) causing bothersome lower urinary tract symptoms increases with our ageing population. Treatment of BPH traditionally begins with medical therapy and surgical intervention is then considered for those whose symptoms progress despite treatment. Minimally invasive surgical therapies have been developed as an intermediary in the treatment of BPH with the aim of decreasing the invasiveness of interventions. These therapies also aim to reduce morbidity and dysfunction related to invasive surgical procedures...
June 2017: Prostate International
Tomer Lewi, Hayden A Evans, Nikita A Butakov, Jon A Schuller
Subwavelength Mie resonators have enabled new classes of optical antenna and nanophotonic devices and can act as the basic meta-atom constituents of low-loss dielectric metasurfaces. In any application, tunable Mie resonances are key to achieving a dynamic and reconfigurable operation. However, the active tuning of these nanoantennas is still limited and usually results in sub-linewidth resonance tuning. Here, we demonstrate the ultrawide dynamic tuning of PbTe Mie resonators fabricated via both laser ablation and a novel solution-processing approach...
June 14, 2017: Nano Letters
Jean Izaaryene, Frederic Cohen, Philippe Souteyrand, Pierre-Henri Rolland, Vincent Vidal, Jean-Michel Bartoli, Veronique Secq, Jean-Yves Gaubert
OBJECTIVES: The incidence of pneumothorax is 7 times higher after lung radiofrequency ablation (RFA) than after lung biopsy. The reasons for such a difference have never been objectified. The histopathologic changes in lung tissue are well-studied and established for RF in the ablation zone. However, it has not been previously described what the nature of thermal injury might be along the shaft of the RF electrode as it traverses through normal lung tissue to reach the ablation zone. The purpose of this study was to determine the changes occurring around the RF needle along the pathway between the ablated zone and the pleura...
April 17, 2017: International Journal of Hyperthermia
Kyu Won Shim, Eun Kyung Park, Dong-Seok Kim
Hypothalamic hamartoma (HH) is a benign indolent lesion despite the presentation of refractory epilepsy. Behavioral disturbances and endocrine problems are additional critical symptoms that arise along with HHs. Due to its nature of generating epileptiform discharge and spreading to cortical region, various management strategies have been proposed and combined. Surgical approaches with open craniotomy or endoscopy, stereotactic approaches with radiosurgery and gamma knife surgery or radiofrequency thermos-coagulation, and laser ablation have been introduced...
May 2017: Journal of Korean Neurosurgical Society
H Fritzsche, K-D Schaser, C Hofbauer
BACKGROUND: Benign bone lesions are much more common than malignant lesions. Some benign bone tumors have a characteristic and typical radiographic appearance, while others are more challenging. Therapy of benign bone tumors differs greatly. While the majority of benign bone tumors do not require surgical therapy, other specific lesions, e. g. aneurysmal bone cysts or giant cell tumors (GCT) of the bone require surgery due to their locally aggressive behavior. DIAGNOSTICS: The major challenge for the radiologist and/or pathologist is the differentiation between a benign and low-grade malignant lesion (e...
June 2017: Der Orthopäde
Jing-Jing Fu, Song Wang, Wei Yang, Wei Gong, An-Na Jiang, Kun Yan, Min-Hua Chen
PURPOSE: To evaluate the protective effect of using thermo-sensitive basement membrane extract (Matrigel) for hydrodissection to minimize thermal injury to nearby structures and to evaluate its heat sink effect on the ablation zone in radiofrequency ablation (RFA) of the liver. MATERIALS AND METHODS: First, the viscosity profile and heat sink effect of Matrigel were assessed during RFA in vitro and ex vivo. Fresh pig liver tissue was used, and the temperature changes in Matrigel and in 5% dextrose in water (D5W) during RFA were recorded...
July 2017: Cardiovascular and Interventional Radiology
P Trimboli, V Zilioli, M Imperiali, L Ceriani, L Giovanella
OBJECTIVE: High-sensitive thyroglobulin assays (hsTg) has decreased the need for stimulated Tg measurements in patients with differentiated thyroid carcinoma (DTC). However, multiple assays analyzing the same samples may report different values. Accordingly, appropriate assay-specific cut-off levels should be selected in representative patient series. Here, we evaluate the role of a new hsTg assay in low-to-intermediate risk DTC patients and select appropriate assay-specific clinical cut-off limits...
May 2017: European Journal of Endocrinology
Laura Silvestroni, Hans-Joachim Kleebe, William G Fahrenholtz, Jeremy Watts
Ceramics based on group IV-V transition metal borides and carbides possess melting points above 3000 °C, are ablation resistant and are, therefore, candidates for the design of components of next generation space vehicles, rocket nozzle inserts, and nose cones or leading edges for hypersonic aerospace vehicles. As such, they will have to bear high thermo-mechanical loads, which makes strength at high temperature of great importance. While testing of these materials above 2000 °C is necessary to prove their capabilities at anticipated operating temperatures, literature reports are quite limited...
January 19, 2017: Scientific Reports
Anderanik Tomasian, Adam N Wallace, Travis J Hillen, Jack W Jennings
Percutaneous image-guided ablation has been shown to be safe and effective for the treatment of benign osseous lesions and has evolved into the treatment of metastatic lesions for both pain palliation and local tumor control. Ablation is increasingly becoming part of the treatment algorithm of painful bone lesions, requiring multidisciplinary input from radiation, surgical, and medical oncologists. Substantial pain reduction is often possible in those who have failed to benefit from conventional therapies such as systemic and radiation therapy...
November 2016: Seminars in Musculoskeletal Radiology
Yinyin Chen, Xiaoran Deng, Chunxia Li, Fei He, Bei Liu, Zhiyao Hou, Ziyong Cheng, Bengang Xing, Jun Lin
Anticancer drug doxorubicin hydrochloride (DOX)-loaded photothermal nanocomposite MnFe2O4@mSiO2 with magnetic targeting and T1/T2-weighted dual-mode magnetic resonance imaging of MnFe2O4 core and NIR/pH-coupling sensitive mesoporous silica shell nanocarriers was designed and synthesized successfully. The anticancer drug DOX can be absorbed into mesoporous layer of MnFe2O4@mSiO2 nanocomposite, which shows obvious photothermal/chemo dual-modal synergistic therapies triggered by NIR/pH. Under 808 nm irradiation, MnFe2O4 can transform light into thermo, which can not only ablate tumor cells directly but also promote chemotherapy drugs releasing from mesoporous layer to kill tumor cells...
April 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
Yibin Deng, Li Huang, Hong Yang, Hengte Ke, Hui He, Zhengqing Guo, Tao Yang, Aijun Zhu, Hong Wu, Huabing Chen
Smart nanoparticles are increasingly important in a variety of applications such as cancer therapy. However, it is still a major challenge to develop light-responsive nanoparticles that can maximize the potency of synergistic thermo-chemotherapy under light irradiation. Here, spatially confined cyanine-anchored silica nanochannels loaded with chemotherapeutic doxorubicin (CS-DOX-NCs) for light-driven synergistic cancer therapy are introduced. CS-DOX-NCs possess a J-type aggregation conformation of cyanine dye within the nanochannels and encapsulate doxorubicin through the π-π interaction with cyanine dye...
February 2017: Small
Sundeep Singh, Ramjee Repaka
PURPOSE: This study aims to analyse the efficacy of temperature-controlled radiofrequency ablation (RFA) in different tissues. MATERIALS AND METHODS: A three-dimensional, 12 cm cubical model representing the healthy tissue has been studied in which spherical tumour of 2.5 cm has been embedded. Different body sites considered in the study are liver, kidney, lung and breast. The thermo-electric analysis has been performed to estimate the temperature distribution and ablation volume...
August 30, 2016: International Journal of Hyperthermia
Luke Tomycz, Ali Haider, Maura Hamilton, David B Clarke, Mark R Lee
INTRODUCTION: It has been increasingly recognized that the insular cortex plays an important role in frontotemporal epilepsy (FTE) in children. The insula, however, cannot properly by monitored with conventional subdural grids, and open surgical resection of the insula is technically difficult and often associated with significant morbidity. Stereotactically placed insular depth electrodes allow direct and comprehensive monitoring of this region, and can easily be replaced with a laser applicator for minimally invasive treatment via thermo-ablation...
August 2016: Neurosurgery
Xin Wang, Xiaozhi Zhao, Tingsheng Lin, Hongqian Guo
PURPOSE: Percutaneous radiofrequency ablation (PRFA) has been used to ablate renal neoplasms with good outcome. However, if bowel lies adjacent to a tumor, ablation increases the risk of thermal bowel injury, and the consequences could be fatal. We describe the technique, effectiveness and safety of using thermo-sensitive hydrogel as insulation to displace the bowel away during PRFA. MATERIALS AND METHODS: The study was divided into two main parts: the in vitro and in vivo studies...
October 2016: International Urology and Nephrology
Nicolas Alberti, Xavier Buy, Nora Frulio, Michel Montaudon, Mathieu Canella, Afshin Gangi, Amandine Crombe, Jean Palussière
Among image-guided thermo-ablative techniques, percutaneous radiofrequency ablation (PRFA) is the most widely used technique for the treatment of primary and secondary lung malignancies. Tolerance of PRFA in the lung is excellent. However, relatively little is known about potential rare complications. This article presents both the clinical and imaging features of lung PRFA complications as well as their prevention and management. Complications may be classified in four groups: pleuropulmonary (e.g., bronchopleural or bronchial fistula, delayed abscess or aspergilloma inside post-PRFA cavitations, pulmonary artery pseudo aneurysm, gas embolism and interstitial pneumonia); thoracic wall and vertebral (e...
June 2016: European Journal of Radiology
J J Fu, S Wang, R H Guan, W Yang, K Yan, M H Chen
OBJECTIVE: To evaluate the effect and safety of using thermo-sensitive Matrigel as artificial ascites on minimizing thermal injury to the nearby structures in a rat model of radiofrequency (RF) ablation of the liver. METHODS: In this research, the morphological characterization of Matrigel was observed at different temperatures in vitro. In vivo study was conducted by using 42 SD rats in Matrigel, Saline and control groups of 14 rats each. Artificial ascites with 10 ml of Matrigel or saline was produced under ultrasound guidance before RF in the experimental groups...
January 5, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
Song Wang, Xing-Guo Mei, S Nahum Goldberg, Muneeb Ahmed, Jung-Chieh Lee, Wei Gong, Hai-Bo Han, Kun Yan, Wei Yang
Purpose To investigate the role of thermosensitive liposome-encapsulated vinorelbine (Thermo-Vin) in combined radiofrequency (RF) ablation of liver tumors. Materials and Methods Approval from the institutional animal care and use committee was obtained before this study. First, the anticancer efficacy of Thermo-Vin was assessed in vitro (H22 cells) for 72 hours at 37°C or 42°C. Next, 203 H22 liver adenocarcinomas were implanted in 191 mice for in vivo study. Tumors were randomized into seven groups: (a) no treatment, (b) treatment with RF ablation alone, (c) treatment with RF ablation followed by free vinorelbine (Free-Vin) at 30 minutes, (d) treatment with RF ablation followed by empty liposomes (Empty-Lip+RF), (e) treatment with RF ablation followed by Thermo-Vin (5 mg/kg), (f) treatment with RF ablation followed by Thermo-Vin (10 mg/kg), and (g) treatment with RF ablation followed by Thermo-Vin (20 mg/kg)...
June 2016: Radiology
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