Radiofrequency (RF)-related heating of cardiac pacemaker leads is a serious concern in magnetic resonance imaging (MRI). Recent investigations suggest such heating to be strongly dependent on an implant's position within the surrounding medium, but this issue is currently poorly understood. In this study, phantom measurements of the RF-induced electric currents inside a pacemaker lead were perf...

BACKGROUND Failure to achieve properly localized, permanent tissue destruction is a common cause of arrhythmia recurrence after cardiac ablation. Current methods of assessing lesion size and location during cardiac radiofrequency ablation are unreliable or not suited for repeated assessment during the procedure. MRI thermography could be used to delineate permanent ablation lesions because tiss...

EXTERNAL heating by conventional electric cautery or by laser provides coagulation of the tissue by conducting the heat from the surface to the inside of the tissue. Conversely, internal heating is the method for necrotizing tumor and hemostasis by means of a dielectric heating electrode, which is inserted into the tissue or tumor. The two methods of administering localized internal thermal the...

Radiofrequency ablation is typically used to heat up malignant liver tissue to critical temperatures in order to kill cancerous cells. However, this hyperthermic process also has noticeable effects on the microvasculature of tumor tissue (i.e. capillary blood vessels). Specifically, it has been empirically shown that heating up cancerous tissue also affects blood flow and oxygen transport. Math...

a large body of evidence now indicates that the amount of mercury released from dental amalgam fillings can be significantly accelerated by exposure to radiofrequency electromagnetic fields (rf-emfs) such as common mobile phones and magnetic resonance imaging (mri). studies performed on the increased microleakage of dental amalgam restorations after exposure to rf-emfs have further supported th...

Nonspecific ¡mmunocompetencein VX2 tumor-bearing rabbits was assessed by skin response to dinitrochlorobenzene and development of antibody titer to bovine serum albumin. Skin reactivity to a 3 M KCI extract of the VX2 and antitumor antibody titer were used to monitor host immunocompetence against the tumor. Rabbits bearing a 15to 20-ml i.m. VX2 tumor in the hind limb were treated by local and ...

A large body of evidence now indicates that the amount of mercury released from dental amalgam fillings can be significantly accelerated by exposure to radiofrequency electromagnetic fields (RF-EMFs) such as common mobile phones and magnetic resonance imaging (MRI). Studies performed on the increased microleakage of dental amalgam restorations after exposure to RF-EMFs have further supported th...

In modern surgery, a multitude of minimally intrusive operational techniques are used which are based on the punctual heating of target zones of human tissue via laser or radio-frequency currents. Traditionally, these processes are modeled by the bioheat equation introduced by Pennes, who considers Fourier’s theory of heat conduction. We present an alternative and more realistic model establish...

Periorbital rhytids are often the first signs of aging skin for which young patients seek a non-invasive, no downtime treatment. Recently, several skin-tightening modalities based on deep dermal heating with various energy sources, such as monopolar and bipolar radiofrequency, as well as laser and broadband infrared light sources, have been introduced to treat mild wrinkles and skin laxity. Thi...