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FAMASITO: FASTMAP Shim Tool towards user‐friendly single‐step B 0 homogenization
Author(s) -
Landheer Karl,
Juchem Christoph
Publication year - 2021
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.4486
Subject(s) - shim (computing) , computer science , homogenization (climate) , algorithm , software , programming language , medicine , biodiversity , ecology , erectile dysfunction , biology
Fast, automatic shimming by mapping along projections (FASTMAP) is an elegant analytical method developed to quantify three‐dimensional first‐ and second‐order spherical harmonic B 0 shapes along six one‐dimensional column projections. The straightforward application of this theoretical concept to B 0 shimming, however, neglects crucial aspects of sequence implementation and shim hardware, commonly necessitating multistep iterative adjustments. We demonstrate a software package, referred to as FASTMAP Shim Tool (FAMASITO), which is composed of a FASTMAP pulse sequence, automated calibration and analysis routines, and a script for automatically performing experiments. With FAMASITO we demonstrate optimal single‐step adjustment of first‐ and second‐order terms (with potential <1% mean refinement of linear terms) in the prefrontal cortex of seven volunteers, one of the most difficult‐to‐shim areas in the adult human brain.