B₀ navigator enables respiratory motion navigation in radial stack-of-stars liver Look-Locker T₁ mapping.

ABSTRACT:

Purpose

To develop a B0$$ {B}_0 $$ self-navigation approach to estimate respiratory motion for motion-corrected liver T1$$ {T}_1 $$ mapping using a Look-Locker acquisition with radial stack-of-stars trajectory.

Methods

The proposed method derives 1D field-map profiles from the oversampled k-space center to estimate a normalized breathing curve and the B0$$ {B}_0 $$ variation amplitude for each slice and coil. B0$$ {B}_0 $$ drift and contrast variations, inherent to the Look-Locker acquisition, were modeled and corrected by fitting and demodulating drift and offset terms. The breathing curve was employed to bin data into motion states for motion-resolved reconstruction, followed by water-specific T1$$ {T}_1 $$ mapping. Simulations with an anatomical body model and in vivo exp

SUBMITTER: Stelter J 

PROVIDER: S-EPMC12309899 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature