Current safety regulations for local radiofrequency (rf) heating, developed for externally positioned rf coils, may not be suitable for internal rf coils that are being increasingly used in interventional MRI. This work presents a two-step model for rf heating in an interventional MRI setting: (1) the spatial distribution of power in the sample from the rf pulse (Maxwell's equations); and (2) t...

Myocardial heating by transcatheter delivery of radiofrequency (RF) energy has been proposed as an effective means of arrhythmia ablation. A thermodynamic model describing the radial temperature gradient at steady state during RF-induced heating is proposed. If one assumes that RF power output is adjusted to maintain a constant electrode-tissue interface temperature at all times, then this ther...

Radiofrequency ablation is one of the common methods used to treat pain, movement or mood disorders. It bases on the electromagnetic energy provided to the selected tissue when an alternating current is applied. The resistive heating produced in this process provokes temperature rise in target tissue and generates lesion for intended therapeutic effects. However, in case when no tissue damage i...

The sensitivity gain of ultrahigh field Magnetic Resonance (UHF-MR) holds the promise to enhance spatial and temporal resolution. Such improvements could be beneficial for cardiovascular MR. However, intracoronary stents used for treatment of coronary artery disease are currently considered to be contra-indications for UHF-MR. The antenna effect induced by a stent together with RF wavelength sh...

There have been numerous independent suggestions to use high speed shocks to heat deuterium gas to thermonuclear temperature (E. Teller, R. R. Wilson, H. Grad, W. Marshall), and extensive experimental work in this field is being carried on by, e.g., Kolb, and Janes. Our own work in this field has been directed towards a fundamental understanding of the strong shock process, in the limit of no p...

The dependence of plasma rotation and heating power on the density limit for MARFE onset hasbeen studied on TEXTOR using different mixtures of auxiliary heating methods (ICRH, co-, andctrNBI). The edge density limit in the plasma heated by NBI is two times larger than thatobserved in the plasma heated by ICRH ( PNBI= PICRH= 1.3 MW). The dependence of the densitylimit with regard...

Extra Ordinary (X) mode conversion to Bernstein wave near Upper Hybrid Resonance (UHR) layer plays an important role in plasma heating through cyclotron resonance. Wave generation at UHR and parametric decay at high power has been observed during Electron Cyclotron Resonance (ECR) heating experiments in toroidal magnetic fusion devices. A small linear system with ECR and UHR layer within the sy...

The laser heating of a plasma with constant density is analyzed using optimal control theory. Heating strategies that minimize the total energy spent, the heating time, or a linear combination of the two, for several values of weighting coelficients, are obtained by determining the optimal laser intensity associated with each point of the phase plane. A numerical example is used to illustrate t...

Electromagnetic fields are created by radiofrequency waves. However, the RF emitted a mobile phone's antenna is insufficient to cause significant heating of tissues in ear or head. The focus this research look further into SAR measurement how much radiation absorbed human body. A CST Microwave studio, high-performance 3D EM analysis software, used for project design, analyse, and measure electr...