Title :
Model Implementation and Case Study for the Lossy, Multilayered Spherical Head Phantom in MRI Application
Author :
Xu, Bin ; Li, Bing Keong ; Crozier, Stuart ; Wei, Qing ; Liu, Feng
Author_Institution :
Sch. of Inf. Technol. & Electr. Eng., Queensland Univ., Qld.
Abstract :
To better simulate RF field behavior in the human head for MRI applications, dyadic Green´s function (DGF)/method of moment (DGF/MOM) -based solutions of the electromagnetic field (EMFs) inside a head-sized, stratified sphere in different MRI coils are presented. The lossy, multilayered spherical head phantom has similar radial conductivity and permeability profiles as human head and is loaded in MRI surface and RF volume coils. B1 field pattern, SAR distribution, flip angle, signal intensity (SI), and other MRI image parameters are calculated in this study. The results reported herein show the operating characteristics of the field/tissue interactions and safety properties for human head model in different coils
Keywords :
Green´s function methods; bioelectric phenomena; biomagnetism; biomedical MRI; brain; method of moments; phantoms; B1 field pattern; MRI; RF field behavior; RF volume coils; SAR distribution; dyadic Green function; electromagnetic field; flip angle; head-sized stratified sphere; lossy multilayered spherical head phantom; moment method; permeability profiles; radial conductivity; signal intensity; Coils; Electromagnetic fields; Green´s function methods; Head; Humans; Imaging phantoms; Magnetic resonance imaging; Message-oriented middleware; Moment methods; Radio frequency;
Conference_Titel :
Engineering in Medicine and Biology Society, 2005. IEEE-EMBS 2005. 27th Annual International Conference of the
Conference_Location :
Shanghai
Print_ISBN :
0-7803-8741-4
DOI :
10.1109/IEMBS.2005.1616691
