User electromagnetic (EM) exposure is continuously being exacerbated by the evolution of multi-antenna portable devices. To mitigate effects EM radiation, devices must satisfy tight regulations on user level, generally measured specific absorption rate (SAR). this end, we investigate SAR-aware uplink precoder design for energy efficiency (EE) maximization in multiuser multiple-input multiple-ou...

This study investigates the optimal external parameters for using an ultrasound applicator for treating bone tumors. This system utilized spherically arranged applicators such as scanned focused ultrasound, and spherically focused multielement applicators. The power deposition pattern is modeled as geometric gain with exponential attenuation. The specific absorption rate ratio (SARR) criteria h...

Experimentally assessing the whole-body specific absorption rate (SAR(wb) ) in a complex indoor environment is very challenging. An experimental method based on room electromagnetics theory (accounting only the line-of-sight as specular path) is validated using numerical simulations with the finite-difference time-domain method. Furthermore, the method accounts for diffuse multipath components ...

Introduction: Communication between mobile phones and antenna BTS (Base Transceiver station) is carried by electromagnetic waves. Energy associated with these waves can be absorbed by biological tissues. so Widespread use of these devices has generated public concern about exposure to electromagnetic waves. In this study the electric field intensity and specific absorption rate...

Four rodent cell lines were exposed to 2450 MHz microwave radiation at a Specific Absorption Rate (SAR) of 103.5 +/- 4.2 W/kg for varying lengths of time at 37 degrees, 40 degrees, 42 degrees and 45 degrees C. mRNA was extracted from microwave-exposed and sham-exposed cells and dot blotted or Northern blotted to nitrocellulose. Radioisotope labelled DNA probes of oncogenes, heat shock protein o...

Cardiovascular magnetic resonance imaging (MRI) has gained widespread acceptance for the assessment of cardiovascular disease (1-4). Recent developments in 3.0 T MRI technology have led to an increased interest in high-field cardiac imaging. Because the signal-to-noise (SNR) scales approximately linearly with the magnetic field strength, B0, an improvement in the SNR can be expected at 3.0 T in...

Authors review the importance of studying the effects of electromagnetic fields (EMF) on microcirculatory system, especially in respect of possibility that vasculature may have direct and indirect role in interaction of static magnetic fields (SMF). We outline the physiological importance of microcirculation and relatively new methods of evaluation technique in vivo and explain in details the l...

The influence of radio frequency (RF) field orientation on specific absorption rate (SAR) in a human head is investigated in this paper. The amount of temperature raised in Human Head due to Mobile Phone usage with different frequency range is analyzed using a versatile electromagnetic field simulator based upon the Finite-Difference Time-Domain method (FDTD).The harmful effects of recent unbra...

A major characteristic in the hyperthermia technology is the ability to focus heat energy on a small region around the tumour to be treated. By applying Kirchhoff-Huygens principle and the scalar theory of diffraction, specific absorption rate (SAR) distribution in a homogeneous muscle due to arrays of open-ended rectangular waveguide as directcontact applicators (ORWDAs) at 915 MHz are calcula...

When moving up to 7 Tesla, one is confronted with a number of challenges including higher specific absorption rate (SAR), enhanced susceptibility and chemical shift artifacts, and inhomogeneities in the B1 RF field. On the other hand, 7T provides enhanced sensitivity and some astounding new contrasts [1]. For the purposes of vascular imaging, 7T harbors several particular advantages. The purpos...