Atrial fibrillation, a cardiac arrhythmia characterized by unsynchronized electrical activity in the atrial chambers of the heart, is a rapidly growing problem in modern societies. One treatment, referred to as catheter ablation, targets specific parts of the left atrium for radio frequency ablation using an intracardiac catheter. Magnetic resonance imaging has been used for both preand and pos...

Radio frequency ablation (RFA) of lung tumors is a relatively new procedure allowing local treatment with minimal parenchymal damage. This technique is able to induce coagulative necrosis in a limited pulmonary area.1 This emerging technology is used to achieve local treatment of primary and secondary lung tumors in patients with poor clinical status or technical contraindications to surgical r...

The viscoelastic characteristics of thermal lesions in ex vivo animal liver are investigated in this paper. Characterization of the moduli of thermal lesions prepared at several temperatures will provide additional information for the elastographic monitoring of radio frequency ablation of hepatic tumors. In this study, the frequency-dependent complex modulus of thermal lesions prepared at temp...

Virtual reality based therapy simulation meets a growing interest from the medical community due to its potential impact for the training of medical residents and the planning of therapies. However, computer models of the human anatomy are often very computationally demanding, thus incompatible with the constraints of such interactive simulations. In this paper, we propose a fast model of the c...

high‑intensity focused ultrasound (hifu) is a novel treatment modality used by scientists and clinicians in the recent decades. this modality has had a great and significant success as a noninvasive surgery technique applicable in tissue ablation therapy and cancer treatment. in this study, radio frequency (rf) ultrasound signals were acquired and registered in three stages of before, during, a...

Introduction: Radio frequency (RF) ablation of the left atrium (LA) and pulmonary vein (PV) ostia has become a clinically acceptable therapy for atrial fibrillation (AF) [1,2]. Recently, a delayed enhancement MRI (DE-MRI) technique has been proposed to visualize and assess the extent of post-ablation scar [3]. This technique visualizes scar in the posterior wall of the LA and the PV ostia where...

rfid has lots of potential benefits for supply chain management; that`s why it has attracted many industry practitioners all around the world, especially in recent years. rfid is one of the key solutions that information technology has provided for industry. the main issue in implementing and also developing this unique technology in the supply chain management of every industry appears to be t...

The treatment options for hepatocellular carcinoma (HCC) are liver resection, liver transplantation, or local ablation (e.g., percutaneous ethanol injection, cryosurgery, radio-frequency ablation, and chemoembolization). Most patients are not eligible for curative resection because of the location of the tumor or the severity of liver disease. For many of these patients, liver transplantation r...

Background Delayed-enhancement (DE) MRI is an effective technique for imaging left atrial (LA) ablation lesions following radio-frequency ablation for atrial fibrillation (AF). Existing techniques for segmentation/visualization of lesions require manual interaction of an expert user making them prone to high observer variability. Oakes et al.[1] applied thresholding on the intensity histogram o...

Atrial fibrillation is a wide spread heart arrhythmia that can be treated by catheter ablation. This procedure may involve a planning step which can be performed based on a 3-D model of the patient’s left atrium (LA) segmented from a CT or MRI volume. One of the first decisions to make during treatment is whether to use a single-shot device or a radio-frequency catheter. This decision is based ...