The specific absorption rate (SAR) of a dilute assembly spherical iron nanoparticles with cubic anisotropy distributed in viscous liquid is calculated using the solution stochastic Landau - Lifshitz equation for unit magnetization vector and equations multiple particle directors that specify spatial orientation nanoparticle liquid. magnetic reversal modes particles are revealed at low sufficien...

The article introduces a new, low-cost, integrated, multiband antenna design intended for wristbands and wearable wireless devices (WWD). With miniaturized planar square-shape sizing 29 × mm2, the can fit easily inside WWDs. proposed covers most used frequency bands such as LTE2300, ISM2400, LTE2600, WiMAX3500, WiMAX5200, ISM5800 in which reaches up to ?25 dB 6.9 dBi terms of S11 gain, respecti...

Introduction For parallel transmission, traditional safety concepts need to be re-assessed, as the local specific absorption rate (SAR) becomes a limiting safety constraint [1] that depends on the pulse design as well as on the individual patient anatomy. Whereas the whole-body SAR can be monitored during the scan, the local SAR cannot be measured in clinical practice. Instead, numerical simula...

This paper presents the numerical evaluation of the specific absorption rate (SAR) calculated with the finite integration technique (FIT) using a glass spherical head model and a λ/2 cylindrical dipole antenna. The model is filled with appropriate frequency-specific fluids with electrical properties that are close to the average brain tissue at the center frequencies 0.835 and 1.9 GHz. The depe...

In electromagnetic dosimetry, anatomical human models are commonly obtained by segmentation of magnetic resonance imaging or computed tomography scans. In this paper, a human head model extracted from thermal infrared images is examined in terms of its applicability to specific absorption rate (SAR) calculations. Since thermal scans are two-dimensional (2D) representation of surface temperature...

This aim of this paper is to investigate the specific absorption rate (SAR) distribution in a human head by using the finite-difference time-domain (FDTD) calculations, due to exposure to EMF radiation from a mobile phone at frequencies 900 MHz Mobile Phone model with a λ/2 monopole antenna and a hand head phone model dimensions are 100 mm x 50 mm x 20 mm. The head model used is a sphere with a...

Electric field strengths normally exceed the reference levels for occupational exposure in close vicinity to large frequency modulation (FM) transmitters. Thus, a detailed investigation on compliance with basic restrictions is needed before any administrative protection measures are applied. We prepared a detailed numerical model of a 20-kW FM transmitter on a 32-m mast. An electrically isolate...

A numerical study of the induced fields and specific absorption rate (SAR) in anatomical phantoms exposed to the radiofrequency (RF) fields of magnetic resonance (MR) scanners was conducted using the finite difference time domain (FDTD) method at 64MHz and 128MHz. Three phantoms including two adults and one child were used. The study revealed inconsistencies between the MRI safety standards and...

Background As shown at 7T Time-of-Flight (TOF) angiography significantly benefits from ultra high field (UHF) [1,2], because of shorter T1 relaxation constant and increased SNR. However, significant challenges have to be overcome before using 7T TOF in clinical applications: I) RF induced specific absorption rate (SAR) substantially increases at UHF, preventing the use of standard RF pulses (ve...

The suitability of magnetic nanoparticles (MNPs) to act as heat nano-sources by application of an alternating magnetic field has recently been studied due to their promising applications in biomedicine. The understanding of the magnetic relaxation mechanism in biocompatible nanoparticle systems is crucial in order to optimize the magnetic properties and maximize the specific absorption rate (SA...