نتایج جستجو برای: radiofrequency heating

تعداد نتایج: 73068  

2007
P. G. FIELDS L. G. NEVEN J. JOHNSON

We present recent advances in quarantine and pre-shipment alternatives: phosphine and methyl bromide recapture for empty ship holds; radio frequency heating in walnuts; low oxygen followed by low oxygen, cold or virus treatment to disinfest dried fruits and nuts; controlled atmosphere temperature treatment system (CATTS) for fresh fruit.

Journal: :JAMA 2011
Henry Lai Lennart Hardell

THE MAJORITY OF THE RADIOFREQUENCY ENERGY emitted by a cellular telephone is absorbed by the hand and head of the user. The total energy absorbed is a function of the specific absorption rate, duration of use, and the manner in which the phone is used. In addition to concerns about potential harmful effects of such exposure, such as the issue of risk of brain cancer, change in brain function re...

Journal: :Magnetic resonance in medicine 2012
Stephan Fandrey Steffen Weiss Jörg Müller

Applying an active intravascular MR catheter device that allows signal transmission from the catheter tip requires special means to avoid radiofrequency-induced heating. This article presents a novel, miniaturized all-optical active MR probe to use with real-time MRI in minimally invasive interventions for catheter guidance and intravascular imaging. An optical link transmits the received MR si...

2008
Judith K. Mühl

One approach to treat liver tumors is local destruction of the tumor for example by radiofrequency ablation. In this intervention an electrode is placed into the tumor and dissipates radiofrequency waves, thereby heating up the surrounding area. The heated tissue coagulates and cells in this region die. The treatment is successful if all tumor cells are destroyed. A computational description fo...

Journal: :Magnetic resonance in medicine 2013
Yigitcan Eryaman Esra Abaci Turk Cagdas Oto Oktay Algin Ergin Atalar

In this work, it is demonstrated that a dual-drive birdcage coil can be used to reduce the radiofrequency heating of metallic devices during magnetic resonance imaging. By controlling the excitation currents of the two channels of a birdcage coil, the radiofrequency current that is induced near the lead tip could be set to zero. To monitor the current, the image artifacts near the lead tips wer...

Journal: :Industrial health 1988
P D Brown-Woodman J A Hadley J Waterhouse W S Webster

The aim of this study was to determine whether the teratogenic effects of radiofrequency (RF) radiation are due to induced hyperthermia at 27.12 MHz. This was achieved by controlling the degree of temperature change and the duration of the elevation at this RF frequency. Pregnant Sprague-Dawley rats, at 9 days gestation were either sham-irradiated or irradiated with continuous shortwave radiati...

Journal: :Applied sciences 2021

The popularity of patch antennas in magnetic resonance imaging (MRI) has reduced because the large size required for antennae to resonate. Since antenna is associated with wavelength and wavelengths that are used MRI substantially large, used. Methods reducing sizes have been proposed; however, these methods reduce penetration depth uniformity. In this study, we area by 30% folding ground plane...

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