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Research

Radiofrequency Concepts for High-field MRI

At very high magnetic fields (B0 > 3 Tesla) the wavelength of the electromagnetic waves used in the MR imaging process become very short (lambda = 11 cm in tissue). Thus, standing wave effects, which are hardly seen at lower field strengths, become dominant, and a homogeneous illumination of the human body is challenging.
Possible solutions to this problem are the use of far-field aerials, multi-channel transmission arrays or travelling waves. In particular the travelling wave concept offers some unique properties, that would allow to build radio-frequency coils with more homogeneous excitation profiles as the other coil concepts.

To reduce the development time of prototypes and evaluate these concepts we use a commercial simulation software for RF field calculation. The software uses detailed 3D models of the hardware setups to calculate the electromagnetic field. To emulate the loading conditions, a complete virtual model of the human body is also available. The vast, but necessary computing power for a realistic simulation of the electromagnetic fields encountered in a MR system is provided by a set of state-of-the-art GP-GPUs (general purpose graphics processing units).
Currently the software is used to compare new 7T coil concepts and to optimize design parameters for hardware prototypes that are built in our radio-frequency laboratory.