The effect of and correction for through-slice dephasing on 2D gradient-echo double angle B1+ mapping.

ABSTRACT:

Purpose

To show that B0$$ {\mathrm{B}}_0 $$ variations through slice and slice profile effects are two major confounders affecting 2D dual angle B1+$$ {\mathrm{B}}_1^{+} $$ maps using gradient-echo signals and thus need to be corrected to obtain accurate B1+$$ {\mathrm{B}}_1^{+} $$ maps.

Methods

The 2D gradient-echo transverse complex signal was Bloch-simulated and integrated across the slice dimension including nonlinear variations in B0$$ {\mathrm{B}}_0 $$ inhomogeneities through slice. A nonlinear least squares fit was used to find the B1+$$ {\mathrm{B}}_1^{+} $$ factor corresponding to the best match between the two gradient-echo signals experimental ratio and the Bloch-simulated ratio. The correction was validated in phantom and in vivo at 3T.

Results

For our RF

SUBMITTER: Belsley G 

PROVIDER: S-EPMC10952755 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature