Correction of Physiologically Induced Global Off-Resonance Effects in Dynamic 
Echo-Planar and Spiral Functional Imaging

Pfeuffer, J; Van de Moortele , P-F; Ugurbil, K; Hu, X; Glover, GH

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Correction of Physiologically Induced Global Off-Resonance Effects in Dynamic Echo-Planar and Spiral Functional Imaging

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https://cds.ismrm.org/ismrm-2002/PDF8/2330.PDF
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Pfeuffer, J., Van de Moortele, P.-F., Ugurbil, K., Hu, X., & Glover, G. (2002). Correction of Physiologically Induced Global Off-Resonance Effects in Dynamic Echo-Planar and Spiral Functional Imaging. Poster presented at 10th Scientific Meeting of the International Society of Magnetic Resonance in Medicine (ISMRM 2002), Honolulu, HI, USA.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-DFD4-1

Abstract

To decrease noise from respiration induced phase and frequency fluctuations, a simple correction of the "Dynamic Off-Resonance in K-space" (DORK) was developed. The correction uses phase information from the center of k-space and a navigator echo, and is illustrated with dynamic scans of single-shot and segmented EPI and, for the first time, spiral imaging of the human brain at 7T. The DORK correction significantly reduced artifacts: pixel shift for EPI, blurring for spiral, and ghosting. While spiral imaging was found to exhibit less noise than EPI before correction, the residual noise after the DORK correction was comparable.