Diffusion tensor imaging and ventricle volume quantification in patients with chronic shunt-treated hydrocephalus: a...

Area of Science:

• Neuroimaging
• Neurology
• Medical Physics

Background:

• Hydrocephalus and cerebrospinal fluid (CSF) shunting can impact white matter integrity.
• Long-term effects of shunting on white matter and their correlation with clinical outcomes require further investigation.
• Diffusion tensor imaging (DTI) offers a non-invasive method to assess white matter microstructure.

Purpose of the Study:

• To characterize long-term white matter changes in shunt-treated hydrocephalus using DTI and tract-based spatial statistics (TBSS).
• To investigate the relationship between ventricular size, white matter integrity, and clinical outcomes (headache, quality of life).

Main Methods:

• Recruited 21 shunt-treated hydrocephalus patients and 21 age/sex-matched controls.
• Acquired anatomical and DTI MRI data on a 3-T scanner.
• Analyzed white matter integrity using fractional anisotropy (FA) and diffusivity measures (AD, RD, MD) via manual regions of interest and TBSS.

Main Results:

• Patients showed significantly lower FA in 20 of 48 white matter regions compared to controls, predominantly in posterior structures.
• Seventeen regions exhibited increased radial diffusivity (RD), indicating impaired white matter integrity.
• Higher FA in periventricular tracts correlated with larger ventricular size and improved clinical outcomes.

Conclusions:

• TBSS-based DTI is sensitive to white matter alterations in hydrocephalus and chronic shunting.
• DTI may aid in tailoring shunt procedures, monitoring ventricular size, and optimizing patient outcomes.
• DTI could guide the development of alternative hydrocephalus therapies.