In Vivo Super-Resolution Track-Density Imaging for Thalamic Nuclei Identification

Area of Science:

• Neuroimaging
• Human Neuroanatomy
• Brain Connectivity

Background:

• Thalamic nuclei are crucial for brain function and altered in neurological/psychiatric disorders.
• Accurate in vivo visualization of thalamic nuclei is a significant neuroimaging challenge.
• Thalamic nuclei targeted by surgery can treat neuropsychiatric diseases.

Purpose of the Study:

• To present a novel protocol for histologically guided delineation of thalamic nuclei.
• To utilize short-tracks track-density imaging (stTDI) for super-resolved white matter mapping.
• To assess the reliability and accuracy of stTDI for thalamic nuclei identification.

Main Methods:

• Developed a protocol for thalamic nuclei mapping using stTDI.
• Employed high angular resolution diffusion tractography for white matter visualization.
• Validated the protocol against a standard-space histological thalamic atlas.

Main Results:

• Identified up to 13 distinct thalamic nuclei bilaterally with high reliability (ICC > 0.98).
• Demonstrated strong similarity between stTDI-derived and histological thalamic atlases.
• Confirmed the utility of stTDI maps for studying thalamic structural and functional connectivity.

Conclusions:

• stTDI provides a reliable and accurate method for in vivo thalamic nuclei mapping.
• This technique has potential applications in basic neuroscience, translational research, and presurgical planning.
• Advances in neuroimaging like stTDI are critical for understanding brain disorders and developing treatments.