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Mapping the human lateral geniculate nucleus and its cytoarchitectonic subdivisions using quantitative MRI
Christa Müller-Axt1, Cornelius Eichner2, Henriette Rusch3
1Faculty of Psychology, Technical University of Dresden, Dresden 01069, Germany; Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig 04103, Germany.
Neuroimage
|September 25, 2021
Summary
Quantitative MRI successfully maps human visual thalamus subdivisions. This technique reveals microstructural differences in the magnocellular and parvocellular layers of the lateral geniculate nucleus (LGN) non-invasively.
Area of Science:
- Neuroimaging
- Neuroanatomy
- Magnetic Resonance Imaging
Background:
- The human lateral geniculate nucleus (LGN) is crucial for visual processing but challenging to study non-invasively due to its small size and deep location.
- Distinct magnocellular (M) and parvocellular (P) subdivisions within the LGN have unique microstructural properties.
- Current methods for characterizing LGN subdivisions in vivo are limited.
Purpose of the Study:
- To determine if quantitative MRI (qMRI) methods can non-invasively map the human LGN and its M and P subdivisions.
- To investigate the microstructural basis of qMRI contrast within the LGN.
- To establish a foundation for studying LGN function and its subdivisions in health and disease.
Main Methods:
- Employed high-resolution 7 Tesla in vivo qMRI in 27 participants.
- Utilized ultra-high resolution 7 Tesla qMRI on a post-mortem human LGN specimen.
- Performed histological validation to correlate MRI findings with cyto- and myeloarchitecture.
Main Results:
- Successfully mapped LGN subdivisions using microstructure-informed qMRI contrast alone.
- Identified two distinct longitudinal relaxation time (T1) components in vivo and post-mortem, corresponding to dorsal P and ventral M subdivisions.
- Histological validation confirmed that MRI contrast reflects cell and myelin density differences, not iron content.
Conclusions:
- Quantitative MRI enables non-invasive mapping of human LGN subdivisions based on microstructural properties.
- The identified qMRI contrast is driven by cyto- and myeloarchitectonic differences.
- This qMRI strategy advances the understanding of LGN microstructure and function in humans.
