Targeted radiofrequency field mapping using 3D reduced field-of-view-catalyzed double-angle method

Dingxin Wang*, Sven Zuehlsdorff, Reed A. Omary, Andrew C. Larson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Purpose: The aim of this study was to develop a targeted volumetric radiofrequency field (B 1 +) mapping technique to provide region-of-interest B 1 + information. Materials and Methods: Targeted B 1 + maps were acquired using three-dimensional (3D) reduced field-of-view (FOV) inner-volume turbo spin echo-catalyzed double-angle method (DAM). Targeted B 1 + maps were compared with full-FOV B 1 + maps acquired using 3D catalyzed DAM in a phantom and in the brain of a healthy volunteer. In addition, targeted volumetric abdomeninal B 1 + mapping was demonstrated in the abdomen of another healthy volunteer. Results: The targeted reduced-FOV images demonstrated no aliasing artifacts in all experiments. Close match between targeted B 1 + map and reference full-FOV B 1 + map in the same region was observed, with percentage root-mean-squared error <0.4% in the phantom and <0.8% in the healthy volunteer brain. The abdominal B 1 + maps showed small B 1 + variation in the kidneys and liver from the healthy volunteer. Conclusion: The proposed 3D reduced-FOV catalyzed DAM provides a rapid, simple and accurate method for targeted volumetric B 1 + mapping and can be easily implemented for applications related to radiofrequency field mapping in small targeted regions.

Original languageEnglish (US)
Pages (from-to)1131-1137
Number of pages7
JournalMagnetic Resonance Imaging
Issue number8
StatePublished - Oct 2011


  • Abdominal MRI
  • Catalyzed double-angle method (DAM)
  • Inner volume
  • Reduced FOV
  • Targeted radiofrequency (RF) field mapping

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Biomedical Engineering


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