scholarly journals Considering Angle Selection When Using Ultrasound Electrode Displacement Elastography to Evaluate Radiofrequency Ablation of Tissues

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Jingjing Xia ◽  
Qiang Li ◽  
Pin-Yu Chen ◽  
Zhuhuang Zhou ◽  
Chiao-Yin Wang ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
Tissue Section ◽  
Image Data ◽  
Ablation Zone ◽  
Invasive Treatment ◽  
Linear Probe ◽  
Electrode Displacement ◽  
Angle Effect ◽  
Highly Correlated ◽  
Experimental Findings

Percutaneous radiofrequency ablation (RFA) is a minimally invasive treatment to thermally destroy tumors. Ultrasound-based electrode-displacement elastography is an emerging technique for evaluating the region of RFA-induced lesions. The angle between the imaging probe and the RFA electrode can influence electrode-displacement elastography when visualizing the ablation zone. We explored the angle effect on electrode-displacement elastography to measure the ablation zone. Phantoms embedded with meatballs were fabricated and then ablated using an RFA system to simulate RFA-induced lesions. For each phantom, a commercial ultrasound scanner with a 7.5 MHz linear probe was used to acquire raw image data at different angles, ranging from 30° to 90° at increments of 10°, to construct electrode-displacement images and facilitate comparisons with tissue section images. The results revealed that the ablation regions detected using electrode-displacement elastography were highly correlated with those from tissue section images when the angle was between 30° and 60°. However, the boundaries of lesions were difficult to distinguish, when the angle was larger than 60°. The experimental findings suggest that angle selection should be considered to achieve reliable electrode-displacement elastography to describe ablation zones.

scholarly journals Successful surgical rescue of delayed onset diaphragmatic hernia following radiofrequency ablation using a thoracoscopic approach for hepatocellular carcinoma: a case report

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Atsushi Morito ◽  
Shigeki Nakagawa ◽  
Katsunori Imai ◽  
Norio Uemura ◽  
Hirohisa Okabe ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Small Intestine ◽  
Radiofrequency Ablation ◽  
Diaphragmatic Hernia ◽  
Invasive Treatment ◽  
Thoracoscopic Approach ◽  
Case Presentation ◽  
Medial Segment ◽  
Liver Surface ◽  
The Right

Abstract Background Radiofrequency ablation (RFA) is widely used as a minimally invasive treatment for hepatocellular carcinoma (HCC). RFA has a low risk of complications, especially compared with liver resection. Nevertheless, various complications have been reported after RFA for HCC; however, diaphragmatic hernia (DH) is extremely rare. Case presentation A 78-year-old man underwent thoracoscopic RFA for HCC located at the medial segment adjacent to the diaphragm approximately 7 years before being transported to the emergency department due complaints of nausea and abdominal pain. Computed tomography revealed a prolapsed small intestine through a defect in the right diaphragm, and emergency surgery was performed. The cause of diaphragmatic hernia was the scar of RFA. We confirmed that the small intestine had prolapsed into the right diaphragm, and we resected the necrotic small intestine and repaired the right diaphragm. Herein, we report a case of ileal strangulation due to diaphragmatic hernia after thoracoscopic RFA. Conclusions Care should be taken when performing thoracoscopic RFA, especially for tumors located on the liver surface adjacent to the diaphragm. Patients should be carefully followed up for possible DH, even after a long postoperative interval.

scholarly journals Ultrasound-Guided Moving Shot Radiofrequency Ablation of Benign Soft Tissue Neoplasm

Medicina ◽  
2021 ◽  
Vol 57 (8) ◽  
pp. 830
Author(s):  
Wei-Che Lin ◽  
Yi-Fan Tai ◽  
Meng-Hsiang Chen ◽  
Sheng-Dean Luo ◽  
Faye Huang ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
Soft Tissue ◽  
General Anesthesia ◽  
Local Anesthesia ◽  
Venous Malformation ◽  
Volume Reduction ◽  
The Other ◽  
Invasive Treatment ◽  
Soft Tissue Neoplasm

Background and Objective: To evaluate the effectiveness of radiofrequency ablation (RFA) using the moving-shot technique for benign soft tissue neoplasm. Materials and Methods: This retrospective study reviewed eight patients with benign soft tissue neoplasm presenting with cosmetic concerns and/or symptomatic issues who refused surgery. Six patients had vascular malformation, including four with venous malformation and two with congenital hemangioma. The other two patients had neurofibroma. All patients underwent RFA using the moving-shot technique. Imaging and clinical follow-up were performed in all patients. Follow-up image modalities included ultrasound (US), computed tomography (CT), and magnetic resonance (MR) imaging. The volume reduction ratio (VRR), cosmetic scale (CS), and complications were evaluated. Results: Among the seven patients having received single-stage RFA, there were significant volume reductions between baseline (33.3 ± 21.2 cm3), midterm follow-up (5.1 ± 3.8 cm3, p = 0.020), and final follow-up (3.6 ± 1.4 cm3, p = 0.022) volumes. The VRR was 84.5 ± 9.2% at final follow-up. There were also significant improvements in the CS (from 3.71 to 1.57, p = 0.017). The remaining patient, in the process of a scheduled two-stage RFA, had a 33.8% VRR after the first RFA. The overall VRR among the eight patients was 77.5%. No complications or re-growth of the targeted lesions were noted during the follow-up period. Of the eight patients, two received RFA under local anesthesia, while the other six patients were under general anesthesia. Conclusions: RFA using the moving-shot technique is an effective, safe, and minimally invasive treatment for benign soft tissue neoplasms, achieving mass volume reduction within 6 months and significant esthetic improvement, either with local anesthesia or with general anesthesia under certain conditions.

Application of ultrasound-guided biopsy and percutaneous radiofrequency ablation in 2 cases with phosphaturic mesenchymal tumor and literature review

2020 ◽  
pp. 1-9
Author(s):  
Meng-Fei Xian ◽  
Kang-Ming Pan ◽  
Jian-Chao Zhang ◽  
Mei-Qing Cheng ◽  
Hui Huang ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
Musculoskeletal Complaints ◽  
Percutaneous Radiofrequency Ablation ◽  
Phosphaturic Mesenchymal Tumor ◽  
Ultrasound Guided ◽  
Invasive Treatment ◽  
Mesenchymal Tumors ◽  
Total Resection ◽  
Guided Biopsy ◽  
Ultrasound Guided Biopsy

Tumor-induced osteomalacia (TIO) is a vanishingly rare paraneoplastic syndrome which is usually caused by phosphaturic mesenchymal tumors (PMTs). The conventional treatment for PMTs is total resection, and ultrasound-guided radiofrequency ablation (RFA) can also be used for the treatment of PMTs patients, especially for patients in whom complete resection may lead to serious complications. We report two cases with PMT who presented syndrome with progressive musculoskeletal complaints and performed ultrasound-guided biopsy and RFA. Ultrasound-guided RFA, which is a safe and effective minimally invasive treatment option, appears to be a valuable alternative to surgery for patients presenting with PMT. We are the first reported case of RFA guided by ultrasonography in the treatment of PMT.

Identification of Outliers in Hyperspectral Raman Image Data by Nearest Neighbor Comparison

2002 ◽  
Vol 56 (11) ◽  
pp. 1458-1461 ◽  
Author(s):  
Caleb J. Behrend ◽  
Catherine P. Tarnowski ◽  
Michael D. Morris
Keyword(s):  
Nearest Neighbor ◽  
Polynomial Interpolation ◽  
Image Data ◽  
Data Sets ◽  
Outlier Identification ◽  
Contaminated Data ◽  
Central Pixel ◽  
Data Points ◽  
Highly Correlated ◽  
Raman Image

A new algorithm for removal of cosmic spikes from hyperspectral Raman image data sets is presented. Spectra in a 3 × 3 pixel neighborhood are used to identify outlier-contaminated data points in the central pixel of that neighborhood. A preliminary despiking of the neighboring spectra is performed by median filtering. Correlations between the central pixel spectrum and its despiked neighbors are calculated, and the most highly correlated spectrum is used to identify outliers. Spike-contaminated data are replaced using results of polynomial interpolation. Because the neighborhood contains spectra obtained in three different frames, even large multi-pixel spikes are identified. Spatial, spectral, and temporal variation in signal is used to accurately identify outliers without the acquisition of any spectra other than those needed to generate the image itself. Sharp boundaries between regions of high chemical contrast do not interfere with outlier identification.

Radiofrequency Ablation of Liver Metastases—Software-Assisted Evaluation of the Ablation Zone in MDCT: Tumor-Free Follow-Up Versus Local Recurrent Disease

2009 ◽  
Vol 33 (2) ◽  
pp. 297-306 ◽  
Author(s):  
Sebastian Keil ◽  
Philipp Bruners ◽  
Katharina Schiffl ◽  
Martin Sedlmair ◽  
Georg Mühlenbruch ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
Liver Metastases ◽  
Recurrent Disease ◽  
Ablation Zone

Gallbladder Needle Decompression during Radiofrequency Ablation of an Adjacent Liver Tumour

2012 ◽  
Vol 63 (3_suppl) ◽  
pp. S37-S40 ◽  
Author(s):  
Dellano D. Fernandes ◽  
Paul B. Shyn ◽  
Stuart G. Silverman
Keyword(s):  
Radiofrequency Ablation ◽  
Thermal Injury ◽  
Bile Leak ◽  
Gallbladder Perforation ◽  
Ablation Zone ◽  
Liver Tumours ◽  
Peritoneal Surface ◽  
Hepatic Ablation ◽  
Needle Decompression ◽  
Distended Gallbladder

Gallbladder perforation with bile leak can result from thermal injury during radiofrequency ablation of liver tumours. Two case studies demonstrate a technique for preventing gallbladder injury to the peritoneal surface of a distended gallbladder adjacent to the anticipated hepatic ablation zone. The use of percutaneous gallbladder needle decompression can safely separate or retract the peritoneal surface of the gallbladder from a contiguous hepatic radiofrequency ablation zone.

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