Abstract #4755

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

Bu Sik Park^1,2, Thomas Neuberger³, Andrew G. Webb^3,4, Don C. Bigler⁵, Christopher M. Collins^2,5

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.