Diffusion tensor anisotropy in adolescents and adults.

Area of Science:

• Neuroscience
• Radiology
• Developmental Biology

Background:

• White matter development is crucial for cognitive function.
• Understanding age-related changes in white matter is essential for diagnosing developmental disorders.

Purpose of the Study:

• To investigate age-related differences in white matter anisotropy between adolescents and adults.
• To identify specific white matter tracts that show developmental changes.
• To explore potential sex differences in white matter development.

Main Methods:

• Diffusion tensor imaging (DTI) was used to acquire images.
• 33 healthy adults (22-64 years) and 15 adolescents (14-21 years) participated.
• Relative anisotropy was assessed in predefined regions of interest within major white matter tracts.

Main Results:

• Most white matter structures showed significant anisotropy differences between adolescents and adults.
• Anisotropy increased with age in tracts like the anterior internal capsule and temporal white matter.
• Anisotropy decreased with age in tracts including the posterior internal capsule, anterior thalamic radiations, and cingulum bundle.
• Sex differences in anisotropy were observed, particularly in the cingulum bundle and internal capsule.

Conclusions:

• White matter development continues beyond adolescence into adulthood.
• Specific white matter tracts exhibit distinct patterns of age-related anisotropy changes.
• Sex influences white matter development, with notable differences in key tracts.