The modeling of induced current density in eyes from static magnetic fields produce by MR scanner

Document Type: Conference Proceedings

Authors

1 MSc in Medical Physics Medical Physics and Medical Engineering Department, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.

2 Assistant Professor, Medical Physics and Medical Engineering Department, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.

3 PHD Candidate, Medical Physics Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

Abstract

Introduction: Staff and patient Movement in static magnetic field MRI scanner induces current density in the human tissues, so cause biologic effects in people. The aim of this study was the Modelling of current density induced by moving individual with different velocities in static magnetic field of magnetic resonance imaging.
Materials and Methods: current density was calculated in a virtual adult male phantom that moved in around of 1/5 T magnetic resonance imaging scanner. (Tissue conductivity properties assume in 1KHz). The current density is computationally determined using the MATLAB software in first By obtaining the electric field induction in the spherical coordinates in the MATLAB software and defining the steps for the phantom, then Maxwell's equations were used to obtain current density so the final formula of the induced current density was obtained, then its value was calculated in different paths and 1 and 2 (m/s) the velocity of the motion.
Results: The average current density induced in the eye tissues at 2 different speeds 1and 2 (m/s) Was obtained Respectively 25/49 and 50/99 (mA/m2).
Conclusion: The electrical characteristics of the eyes are caused induced higher current density than other tissues. This relatively high current density is a good reason for magnetophosphence effect while moving around the magnetic resonance imaging device. The amount of current density induced in the eye tissues increases with increasing speed, so it is advisable to slowly moving for employees and patients in the magnetic resonance imaging room.

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