Calculating SAR Distribution and RF Electromagnetic Field Due To MRI Coil at Human Model

Abstract

Abstract

MRI (magnetic resonance imaging) is an effective method for diagnosis of diseases. The MRI system is made of some important units including RF (radio frequency) devices [1]. The RF coil is one of the important parts in the RF unit. During the imaging, the RF coil radiates EM (electromagnetic) pulse to the human body and in response receives the NMR (nuclear magnetic resonance) signals emitted from the nuclei, which constitutes the human body. Therefore, it is necessary to estimate the SAR (specific absorption rate) in the human body due to the radiated EM energy from the MRI coils. However, in recent years, MR imaging is used not only for the head but also for other parts of the body. Especially, in this study, the SAR distributions in the head and abdomen of a human model are investigated. Electric and magnetic field distribution also seen around the human model.

Keywords: electromagnetic field, FDTD (finite difference time domain method), human model, MRI coil, SAR (specific absorption rate)