Title :
Comparative Study of Symmetric and Asymmetric Cylindrical MRI Gradient Y-Coils in terms of Induced Eddy Currents
Author :
Trakic, Adnan ; Liu, Feng ; Crozier, Stuart
Author_Institution :
Sch. of Inf. Technol. & Electr. Eng., Queensland Univ., St. Lucia, Qld.
Abstract :
We have recently introduced the concept of whole-body asymmetric MRI systems. In this theoretical study, we investigate the PNS characteristics of whole-body asymmetric gradient systems as compared to conventional symmetric systems. Recent experimental evidence supports the hypothesis of transverse gradients being the largest contributor of PNS due to induced electric currents. Asymmetric head gradient coils have demonstrated benefits in the past. The numerical results are based on an anatomically-accurate 2mm-human voxel-phantom NORMAN. The results of this study can facilitate the optimization of whole-body asymmetric gradients in terms of patient comfort/safety (less PNS), while prospering the use of asymmetric MRI systems for in-vivo medical interventions
Keywords :
bioelectric phenomena; biomedical MRI; coils; eddy currents; optimisation; phantoms; 2 mm; PNS characteristics; asymmetric cylindrical MRI gradient y-coils; asymmetric head gradient coils; human voxel-phantom NORMAN; in-vivo medical interventions; induced eddy currents; induced electric currents; optimization; patient comfort; patient safety; symmetric cylindrical MRI gradient y-coils; transverse gradients; whole-body asymmetric gradient systems; Coils; Conductivity; Dielectric losses; Eddy currents; Finite difference methods; Frequency; Information technology; Integral equations; Magnetic resonance imaging; Magnetic shielding; NORMAN; PNS; Whole-body; asymmetric; gradient systems; voxel-phantom;
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.2005.1616121
