Signal Processing Seminar

Jeroen van Gemert

Strong magnetic background fields are of great interest in Magnetic Resonance Imaging (MRI), since images with high spatial resolution can be obtained at reduced scanning times. Strong background fields may cause RF interference effects, however, and these effects can severely degrade the quality of an MR image. This problem can be partly resolved using various advanced and mostly expensive techniques, but there is also a cheap and practical solution, namely, dielectric pads. The design of such a pad is not trivial. Normally, finding the “optimal” pad for a specific region of interest involves evaluating many different pad designs using electromagnetic field simulations. This is a very time-consuming approach taking hours to days of computation time. We propose a nonlinear optimization method based on model order reduction that allows us to design high-permittivity pads in less than 30 seconds.

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Overview of Signal Processing Seminar