Cartesian MaxGIRF: Model-based EPI reconstruction incorporating gradient nonlinearity and concomitant field effects.

ABSTRACT:

Purpose

Lower field strength scanners with large bore size or complex geometries, and scanners with stronger gradient systems experience increased gradient nonlinearity and concomitant fields, each of which causes distortions in EPI. Current correction approaches based on image-domain interpolation introduce undesirable spatial blurring. To avoid spatial blurring, we introduce a model-based EPI reconstruction framework, denoted Cartesian MaxGIRF ("Max"well field correction using "GIRF"-predicted gradients), that simultaneously compensates the effects of concomitant fields, gradient nonlinearity, and off-resonance during image reconstruction.

Theory and methods

Performance of the proposed framework was compared against standard correction methods using phantom datasets at 0.5

SUBMITTER: Lee NG 

PROVIDER: S-EPMC12681320 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature