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Abstract #4755

Reduced Sample Heating in High Field Micro-MRI Using a Copper Wire Shield: Experimental and Numerical Results

Bu Sik Park1,2, Thomas Neuberger3, Andrew G. Webb3,4, Don C. Bigler5, Christopher M. Collins2,5

1Bioengineering , The Pennsylvania State University, Hershey, PA, USA; 2Radiology, The Pennsylvania State University, Hershey, PA, USA; 3Bioengineering, The Pennsylvania State University, University Park, PA, USA; 4Radiology, Leiden University Medical Center, Leiden, Netherlands; 5Bioengineering, The Pennsylvania State University, Hershey, PA, USA

In high field microimaging, sample power loss can cause significant temperature increases (T), and the conservative electric field (Ec) can be a significant factor in the total sample electric field (Et). Based on previous research, we introduce a simple method to decrease sample power loss and related T with minimal impact on the RF magnetic field (B1) distribution by using passive copper wires to shield the sample from the Ec of the coil. Numerical calculations show greatly-reduced Et in the sample with little effect on B1. Experimental measurement of T showed it to be about 60% lower with the Ec shield for several different input powers.