Abstract #0319

Maxwell Field Compensation for 2D Spiral-Ring Turbo Spin-Echo Imaging at 0.55T and 1.5T

Zhixing Wang¹, Xue Feng¹, Rajiv Ramasawmy², Adrienne E. Campbell-Washburn², John P. Mugler III³, and Craig H. Meyer^1,3

¹Biomedical Engineering, University of Virginia, Charlottesville, VA, United States, ²Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States, ³Radiology & Medical Imaging, University of Virginia, Charlottesville, VA, United States

Synopsis

Concomitant (Maxwell) fields are problematic for TSE imaging when the readout waveforms vary along the echo train, leading to severe signal dropouts and image blurring. These effects are exaggerated when using prolonged, high-gradient amplitude readouts at lower magnetic-field strengths. The purpose of this work was to implement 2D TSE imaging using annular spiral rings with compensation of self-squared concomitant-gradient terms at the echo time and across echo spacings via gradient waveform modifications, and with compensation of the residual Maxwell- and B₀-field induced phase accruals along the readout via image reconstruction. This method reduced artifacts at both 0.55T and 1.5T.

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