Meeting Banner
Abstract #1623

Evaluation of dynamic off-resonance correction of respiratory instability in MRI signals for high-order spherical harmonic basis set and multivariate modeling of respiratory sources

Marta Bianciardi 1 , Jonathan R Polimeni 1 , Kawin Setsompop 1 , Cornelius Eichner 1 , Berkin Bilgic 1 , and Lawrence L Wald 1

1 Department of Radiology, A.A. Martinos Center for Biomedical Imaging, MGH, Harvard Medical School, Boston, MA, United States

Chest motion due to respiration produces off-resonance (OR) effects in the brain, resulting in signal-instability in both structural and functional MRI. Previous work performed dynamic OR-correction using a second-order spatial model, and a univariate temporal respiratory model. Aim of this work was to evaluate dynamic OR correction for increased degrees-of-freedom in both spatial and temporal domain. Our results demonstrate the benefits of higher order (up to the fifth) spatial models combined with the use of bivariate temporal modeling of respiratory effects. These findings show the expected dynamic capabilities of high-order shim-arrays at high magnetic field and on a whole-brain basis.

This abstract and the presentation materials are available to members only; a login is required.

Join Here