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7 T body MRI: B1 shimming with simultaneous SAR reduction

Bob van den Bergen1, Cornelis A T Van den Berg, Lambertus W Bartels

  • 1Department of Radiotherapy, University Medical Center Utrecht, PO Box 85500, HP Q.00.118, 3508 GA Utrecht, The Netherlands. B.vandenBergen@UMCUtrecht.nl

Physics in Medicine and Biology
|September 1, 2007
PubMed
Summary

This study introduces a B1 shimming technique to improve radiofrequency field homogeneity and reduce specific absorption rate (SAR) in 7 Tesla MRI body imaging. The method offers significant SAR reduction and improved B1 homogeneity, enhancing imaging prospects.

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Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...