Visualization of the Medial and Lateral Geniculate Nucleus on Phase Difference Enhanced Imaging

Area of Science:

• Neuroimaging
• Radiology
• Neuroanatomy

Background:

• Precise identification and measurement of the medial geniculate nucleus (MGN) and lateral geniculate nucleus (LGN) are challenging due to their small size.
• Conventional MRI techniques have limitations in visualizing these thalamic nuclei.

Purpose of the Study:

• To compare the visualization of the MGN and LGN using phase difference enhanced imaging (PDIs) against other MRI sequences at 3T.
• To measure the volume and height of the MGN and LGN using PDIs.

Main Methods:

• Acquired various MRI sequences (PDIs, 2D-T2WI, STIR, proton attenuation-weighted, DTI) on 10 healthy volunteers at 3T.
• Two neuroradiologists assessed qualitative visualization scores for MGN and LGN boundary identification.
• Measured MGN and LGN volume and height on PDIs.

Main Results:

• PDIs demonstrated significantly higher qualitative visualization scores for both MGN and LGN compared to T2-weighted, proton attenuation-weighted, STIR, and DTI sequences (P < .05).
• MGN and LGN were clearly bordered by distinct low-intensity structures on PDIs.
• MGN volume ranged from 74.0–183.75 mm³ (mean 129.0 ± 34.7 mm³); LGN volume ranged from 96.5–173.75 mm³ (mean 135.2 ± 28.0 mm³).

Conclusions:

• Phase difference enhanced imaging is superior for depicting the MGN and LGN on 3T MRI compared to conventional sequences.
• Individual variations in MGN and LGN volumes were observed.