Abstract #4507

Determination of the dielectric constant for RF passive shimming at 4T MRI

Mohan Lal Jayatilake^1,2, Christopher T Sica^2,3, Rommy Elyan², Rang Pang¹, Dhevin Karunanayaka², Anupa Ekanayaka⁴, and Prasanna Karunanayaka^2,5

¹Department of Neurosurgery, Pennsylvania State University, Hershey, PA, United States, ²Center for Nuclear Magnetic Resonance Research, Pennsylvania State University, Hershey, PA, United States, ³Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, State College, PA, United States, ⁴Grodno State Medical University, Grodno, Belarus, ⁵Department of Radiology, Pennsylvania State University, Hershey, PA, United States

Synopsis

Optimal image quality for Magnetic Resonance Imaging (MRI) at high fields requires a homogeneous RF (B1) field; however, the dielectric properties of the human brain results in B1 field inhomogeneities, and signal loss at the periphery of the head. Selecting the appropriate permittivity and quantity of material for the shim is essential. Here, we introduce a theoretical framework for determining the requisite dielectric constant of the passive shim material directly.

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