We measured the time difference and weighted frequency difference conductivity images to monitor the changes of temperature and tissue property in a liver phantom due to the microwave ablation. Pixels in regions of interest were compared between conventional boundary surface electrode method and focused configuration with an internal electrode.

INTRODUCTION We have developed a motorized MR-compatible manipulator with a remote-center-of-motion (RCM) control to assist MR guided microwave ablation of liver tumors and started clinical studies using it. Our preliminary experiences of the initial two cases have been reported at the previous ISMRM meeting in Toronto. The manipulator was designed to puncture liver tumors from the anterior abd...

PURPOSE The aim of this study was to compare the feasibility, efficacy and safety of microwave ablation and saline-linked radiofrequency (Aquamantys) in liver resection. METHODS Sixteen domestic pigs (8 per group) underwent thermoablations. Group A consisted of 8 pigs in which microwave left lateral liver resection was performed. Group B consisted of 8 pigs which underwent left lateral liver ...

We describe the application of a Bayesian variable-number sample-path (VNSP) optimization algorithm to yield a robust design for a floating sleeve antenna for hepatic microwave ablation. Finite element models are used to generate the electromagnetic (EM) field and thermal distribution in liver given a particular design. Dielectric properties of the tissue are assumed to vary within +/- 10% of a...

OBJECTIVE To evaluate the efficacy and safety of a new generation of 2.45-GHz microwave to ablate hepatocellular carcinoma by surgical approach. DESIGN; Case series with prospective follow-up. SETTING A university teaching hospital in Hong Kong. PATIENTS From March 2009 to January 2011, 26 consecutive patients (19 men and 7 women) with a median age of 63 (range, 49-79) years with hepatocell...

The electromagnetic fields have a great influence on the behaviour of all the living systems. Microwaves occupy range in the EM spectrum is between frequencies of 300 MHz to 300 GHz with wavelengths of approximately 1 m to 1 mm. From several decades, hyperthermia has become major subject of interest in investigating the biological effects and applications of microwaves. Therapeutic applications...

S. Naka, Y. Kurumi, K. Demura, K. Sato, T. Yamaguchi, H. Shiomi, Y. Endo, K. Hanasawa, T. Tani, S. Morikawa, T. Inubushi, H. A. Haque Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan, Molecular Neuroscience Research Center, Shiga University of Medical Science, Otsu, Shiga, Japan, GE Yokogawa Medical Systems, Hino, Tokyo, Japan Synopsis: From January 2000 to December 2002, 57 nod...

Background Image-guided thermal ablation can be used for the treatment of medically inoperable primary and metastatic lung cancer. These techniques are based on the heating up or freezing (cryoablation) of a volume of tissue around a percutaneous applicator that induces necrosis of the tumor. Method The English-language literature concerning thermal ablation of the lung was reviewed. Radiofrequ...