B 0 Magnetic Field Conditions in the Human Heart at 3 T Across One Thousand Subjects: A Numerical Simulation Study

Functional scans in cardiovascular magnetic resonance (CMR) adopting bSSFP sequences suffer from dark band artifacts due to B 0 inhomogeneity. The best remedy to mitigate this issue is through cardiac B 0 shimming. The development of an optimal B 0 shim strategy for the human heart is hindered by a...

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Bibliographic Details
Published inNMR in biomedicine Vol. 38; no. 3; p. e70006
Main Authors Shang, Yun, Theilenberg, Sebastian, Peng, Boyu, Schreiber, Laura M., Einstein, Andrew J., Jambawalikar, Sachin R., Juchem, Christoph
Format Journal Article
LanguageEnglish
Published England 01.03.2025
Subjects
Adolescent
Adult
Aged
Computer Simulation
Female
Heart - diagnostic imaging
Humans
Magnetic Fields
Magnetic Resonance Imaging
Male
Middle Aged
Numerical Analysis, Computer-Assisted
Tomography, X-Ray Computed
Young Adult
cardiovascular MRI
dark band artifacts
B0 simulation
B0 shimming
dynamic shimming
SSFP
population analysis
B0 magnetic field
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Summary:Functional scans in cardiovascular magnetic resonance (CMR) adopting bSSFP sequences suffer from dark band artifacts due to B 0 inhomogeneity. The best remedy to mitigate this issue is through cardiac B 0 shimming. The development of an optimal B 0 shim strategy for the human heart is hindered by a limited understanding of B 0 conditions in clinical diagnostic orientations of CMR. Here, we present high‐resolution B 0 distributions in cardiac imaging planes, derived from simulations utilizing high‐resolution computed tomography (CT) images from 1008 subjects, and present an oblique slicing method to derive such B 0 distributions. This study also presents a theoretical analysis of spherical harmonic B 0 shimming at 3 T using a static global approach and slice‐specific dynamic shim updating in the short‐axis view of human hearts. The characteristics of cardiac B 0 conditions along with spherical harmonic shimming were correlated with the subjects' demographic parameters, with weak or no correlations, suggesting limited demographic commonality and predominantly subject‐specific characteristics in cardiac B 0 . The segmented lung volume shows more significant associations and relatively higher correlations with B 0 conditions, indicating that B 0 conditions in the heart rely on the anatomy surrounding the heart more than overall body shape and size. This research provides a basis for the development of optimized cardiac B 0 shim strategies.
ISSN:0952-3480
1099-1492
DOI:10.1002/nbm.70006