Improvement of Spatial Resolution in Calculated Magnetic Field Perturbations Induced by Low Magnetic Susceptibility Devices for the MRI Image Simulator

The artifacts induced by magnetic susceptibility distribution cause serious problems for MR-guided therapeutic procedures. The effects of the devices on the perturbations need to be evaluated. However, the spatial resolution for field calculation is insufficient because of computer memory limitations. To overcome this challenge, we developed a computer code based on the superposition principle to increase the local resolution and on expansion of the calculation volume with extrapolation. We successfully applied the method to the needles penetrated into the realistic head model and demonstrated the susceptibility effects of the device. The computer code should be useful in designing MR-compatible devices.

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