There are multiple definitions:
low-frequency fluctuation(English)
- this confounding physiological noise is a concern for functional connectivity analyses in blood oxygen level-dependent (BOLD) functional magnetic resonance imaging (fMRI)
- BOLD, DMN, fMRI, ICA
- Medical imaging, Signal analysis
- https://doi.org…eth.2009.11.015
low fetal fraction(English)
- distinguishing between LFF and LQS optimizes counseling because maternal characteristics and pregnancy outcome differ between these groups
- LQS, NIPT, NICU, SGA
- Obstetrics, Pregnancy
- https://doi.org/10.1002/pd.6423