Eddy Currents in Human Body Induced by MRI Medical Examination

    Projekt: Foschungsprojekt



    In many medical check-ups Magnetic Resonance Imaging (MRI) is involved. This project deals with calculations of induced current densities and energy deposition in the simulated human body during MRI and enables thus an estimation of a possible hazard. The geometric and electrical properties of the human torso, as well as the operational conditions of coils generating switched gradients of the low-frequency magnetic fields and radio-frequency magnetic fields of 1.5 T MRI machines for medical diagnosis have been simulated. The human torso has been modeled from MR scans of a volunteer by Finite Element Method. The FE software has been developed at Institute for Fundamentals and Theory in Electrical Engineering. The FE formulation has been A,V/Phi. The model consists of 20 layers, spaced 3 cm apart.

    This gives altogether 2596 elements, 636 of which are needed for fulfilling the boundary condition (F should be zero at the farthest boundaries). In this model thirteen different kinds of tissues have been modelled: bone, cartilage, fat, lungs, intestines, skin, muscle, blood, liver, heart muscle, kidney, nerves and spleen, with the following organs being distinguished: kidneys, heart muscle, lungs, spinal cord, liver and spleen. The simulated frequency has been 64 MHz, corresponding to 1.5 MRI machine. Simulated exposure system has been the so-called bird-cage coil with 12 rods with capacitors in the ring.
    Tatsächlicher Beginn/ -es Ende1/01/9531/12/99