Determination of the dielectric constant for RF passive shimming at 4T MRI
Mohan Lal Jayatilake1,2, Christopher T Sica2,3, Rommy Elyan2, Rang Pang1, Dhevin Karunanayaka2, Anupa Ekanayaka4, and Prasanna Karunanayaka2,5
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
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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