نتایج جستجو برای: radiofrequency fields
تعداد نتایج: 262715 فیلتر نتایج به سال:
Magnetic resonance imaging (MRI) is the modality of choice for imaging desmoid tumors in most cases. MRI uses a series of complex, changing magnetic fields and low energy electromagnetic pulses (radiofrequency waves) to create images of the body. Unlike x-rays and CT scans, MRI emits no ionizing radiation. The standard MR imaging sequences that are used for soft tissue tumor imaging at my insti...
Background: Non-invasive body contouring is one of the fastest growing fields in aesthetic medicine. Vanquish is a new, non-invasive, treatment that claims to reduce waist circumference by thermo-lysis of subcutaneous fat. Vanquish is an FDA approved device that uses selective, focus-field radiofrequency (RF) for deep tissue heating of the abdomen and flanks. To date there is no large clinical ...
Mobile phones and Wi-Fi radiofrequency radiation are among the main sources of the exposure of the general population to radiofrequency electromagnetic fields (RF-EMF). Previous studies have shown that exposure of microorganisms to RF-EMFs can be associated with a wide spectrum of changes ranged from the modified bacterial growth to the alterations of the pattern of antibiotic resistance. Our l...
Numerical Modeling of Non-equilibrium Plasma Discharge of Hydrogenated Silicon Nitride (SiH4/NH3/H2)
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 ...
In the present study, the alteration in the sleep EEG in rats due to chronic exposure to low-level non-thermal electromagnetic radiation was investigated. Two types of radiation fields were used; 900 MHz unmodulated wave and 900 MHz modulated at 8 and 16 Hz waves. Animals has exposed to radiation fields for 1 month (1 h/day). EEG power spectral analyses of exposed and control animals during slo...
Importance : Hepatocellular carcinoma (HCC) is the third leading cause of cancer death worldwide. Despite recent approval several new agents, long-term disease control remains elusive for most patients. Administration 27.12 MHz radiofrequency (RF) electromagnetic fields (EMF) by means a spoon-shaped antenna (TheraBionic P1 device) placed on anterior part tongue results in systemic delivery low ...
The increasing use of mobile phones has aroused public concern regarding the potential health risks of radiofrequency (RF) fields. We investigated the effects of exposure to RF fields (2.45 GHz, continuous wave) at specific absorption rate (SAR) of 1, 5, and 10 W/kg for 1, 4, and 24 h on gene expression in a normal human glial cell line, SVGp12, using DNA microarray. Microarray analysis reveale...
Application of nuclear magnetic resonance imaging (NMRI) as a non-invasive and accurate imaging procedure has been widely used in recent years. Meanwhile, the biological effects of magnetic fields of several tesla (T) and high energy radiofrequency (RF) is not fully known yet. Because of controversy over this issue, the present research has been carried out in order to verify the effects of...
This paper reviews thermal and nonthermal mechanisms of interaction between radiofrequency (RF) fields and biological systems, focusing on pulsed fields with high peak power but low duty cycle. Models with simplified geometry are used to illustrate the coupling between external electromagnetic fields and the body, and with cellular and subcellular structures. Mechanisms of interaction may be li...
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