In this work, we model a radiofrequency discharge of hydrogenated silicon nitride in a capacitive coupled plasma reactor using Maxwellian and non-Maxwellian electron energy distribution function. The purpose is to investigate whether there is a real advantage and a significant contribution using non-Maxwellian electron energy distribution function rather than Maxwellian one for determining the ...

The high information content of MRI exams brings with it unintended effects, which we call artifacts. The purpose of this review is to promote understanding of these artifacts, so they can be prevented or properly interpreted to optimize diagnostic effectiveness. We begin by addressing static magnetic field uniformity, which is essential for many techniques, such as fat saturation. Eddy current...

cardiology. Current methods include chest X-ray, echocardiography, nuclear scintigraphy, and catheterisation-based invasive techniques. The proliferation of imaging has undoubtedly led to major advances in the specialty. If William Harvey were alive today, however, he might be the first to tell us that the current imaging methods have severe limitations and drawbacks, related to issues such as ...

Renal sympathetic denervation (RSD) by the radiofrequency ablation was used to treat the resistant hypertension in clinic and has achieved curative effect. But the temperature distribution in the artery walls and the blood flow have not been investigated. Finite element method (FEM) based on Comsol Multiphysics 4.3a software was used to simulate the temperature distribution in the renal artery....

The primary concern of this thesis is in the design of RadioFrequency (RF) Pulses to be used for Ultra-High Field Magnetic Resonance Imaging. A movement towards higher magnetic field strength has noted advantages. In particular, increased Signal to Noise Ratio (SNR) with increasing field strength. However higher field strength also poses difficult problems, as a result of increasing inhomogenei...

Nu uclear magnetic resonance (NMR)' spectroscopy, which has been used by chemists and physicists for more than 30 years, is now becoming a powerful technique in the medical sciences because of its unique ability to monitor intracellular metabolites noninvasively. The fundamental principle underlying NMR spectroscopy is that nuclei of certain atoms, such as hydrogen ('H), phosphorus (31p), carbo...