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Abstract #4232

An Integrated RF-receive/B0-shim Array Coil Improves whole-brain MR Spectroscopic Imaging at 7T

Morteza Esmaeili1,2, Jason Stockmann1, Bernhard Strasser1, Zhe Wang3, Lawrence Wald1, and Ovidiu C. Andronesi1
1Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States, 2Department of Diagnostic Imaging, Akershus University Hospital, Lørenskog, Norway, 3Siemens Medical Solutions, Charleston, MA, United States

An advanced local shimming technique can substantially improve magnetic resonance spectroscopic imaging (MRSI) which suffers from the inevitable local B0 inhomogeneities, particularly at ultra-high field. We evaluated the performance on an ultra-high field 7T MRI system of a custom-designed 32-channel head coil that with both RF-receive and DC-shim capability. Each coil loop simultaneously and independently runs AC and DC currents for RF-receive and B0-shimming. We examined the multi-coil shimming performance on five healthy volunteers using MRSI. The combined setup of DC-enabled local shimming and highly-efficient spectroscopic acquisition resulted in a noticeable improvement in the quality of spatial metabolic maps.

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