Specific absorption rate implications of within‐scan patient head motion for ultra‐high field MRI

Specific Absorption Rate Analysis of Heterogeneous Head Models with EEG Electrodes/Leads at 7T MRI

Specific Absorption Rate (SAR) in the head of Tablet user's

Wireless communication devices such as tablets are increasing and developing rapidly. The effects of the electromagnetic (EM) waves in the human body from the wireless communication devices have been paid attention. It is well known that the absorption of electromagnetic waves on the human head for a certain period of time may lead to health problems such as headaches, or even worse, significan...

MRI scanner‐independent specific absorption rate measurements using diffusion coefficients

OBJECTIVE The purpose of this study was to measure specific absorption rate (SAR) during MRI scanning using a human torso phantom through quantification of diffusion coefficients independently of those reported by the scanner software for five 1.5 and 3 T clinical MRI systems from different vendors. METHODS A quadrature body coil transmitted the RF power and a body array coil received the sig...

Experimental Temperature and Specific Absorption Rate Mapping Using MRI in a Transmit-receive Head Coil at 3.0T

Introduction: MRI-based temperature mapping techniques have been applied to detect the temperature changes (∆T ) for a variety of applications, including during the thermoablation of tumors [1], and in verifying minimal temperature increment induced by EEG electrodes and/or its wires during MRI [2]. Although numerical calculations have been used to predict SAR distributions and resulting temper...

Design of Miniaturized Double-Negative Material for Specific Absorption Rate Reduction in Human Head

In this study, a double-negative triangular metamaterial (TMM) structure, which exhibits a resounding electric response at microwave frequency, was developed by etching two concentric triangular rings of conducting materials. A finite-difference time-domain method in conjunction with the lossy-Drude model was used in this study. Simulations were performed using the CST Microwave Studio. The spe...