نتایج جستجو برای: radiofrequency fields

تعداد نتایج: 262715  

2016
Robert Lefkowitz

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...

Journal: :Plastic and reconstructive surgery 2015
Ruth J Barta Christopher Hillard Daniel Bernstein Morgan R Betker Cherrie A Heinrich

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 ...

2017
M. Taheri S. M. J. Mortazavi M. Moradi S. Mansouri G. R. Hatam F. Nouri

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...

C. Zoheir M. Grari,

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 ...

2013
Haitham S. Mohammed Heba M. Fahmy Nasr M. Radwan Anwar A. Elsayed

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...

Journal: :4 open 2021

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 ...

Journal: :Journal of radiation research 2011
Tomonori Sakurai Tomoko Kiyokawa Eijiro Narita Yukihisa Suzuki Masao Taki Junji Miyakoshi

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...

H MOZDARANI, MR TOHIDNIA,

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...

Journal: :International Journal of Environmental Research and Public Health 2014

2000
Kenneth R. Foster

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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