Tutorial: MRI Loop Coil

From openEMS

• Download the latest matlab file using Github: MRI_Loop_Coil.m

Contents 1 Requirements 2 This tutorial covers 3 Alternatives 4 Results 5 Literature 5.1 Return To Tutorials Index

Requirements

• openEMS v0.0.31 or later
• Matlab R2011a or later for converting the body model once! (Octave currently is not supported, see Alternatives below)
• The "Virtual Family Model" ^[1]: [1] (see Alternatives below)

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This tutorial covers

• setup of a MRI Loop Coil for 7T
• Converting and including a Virtual Family Body Model
• adding two SAR dump box planes
• calculate the S-Parameter and input-impedance of the loop coil
• calculate and plot and
• calculate and plot the SAR distribution

Alternatives

If you don't have access to Matlab (to convert the body model once) or have no access to the virtual family body models, you may want to replace the discrete material with a simple phantom model:

CSX = AddMaterial(CSX, 'phantom_head');
CSX = SetMaterialProperty( CSX,'phantom_head', 'Epsilon', 60, 'Kappa', 0.7, 'Density', 1040);
CSX = AddSphere(CSX, 'phantom_head', 0, [0 0 0], 110,'Transform',{'Scale',[1 0.8 1]} ); 

Results

MRI Loop Coil, VF human body model and SAR plot in Paraview

logarithmic B_1 field distribution on a xy-plane

logarithmic B_1 field distribution on a xz-plane

local SAR distribution on a xy- and xz-plane

Literature

1. ↑ Christ A, Kainz W, Hahn E G, Honegger K, Zefferer M, Neufeld E, Rascher W, Janka R, Bautz W, Chen J, Kiefer B, Schmitt P, Hollenbach H P, Shen J X, Oberle M,Szczerba D, Kam A, Guag J and Kuster N: The Virtual Family – Development of surface­based anatomical models of two adults and two children for dosimetric simulations, Phys. Med. Biol. 55 (2010)

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