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Summary
This summary is machine-generated.

PSMD-2, a novel diffusion MRI marker, enhances sensitivity for detecting early cerebral small vessel disease (SVD) changes. This improved marker significantly reduces sample size requirements for clinical trials targeting SVD.

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Area of Science:

  • Neuroimaging
  • Radiology
  • Biomarkers

Background:

  • Cerebral small vessel disease (SVD) is common in older adults and Alzheimer's disease.
  • Conventional MRI markers detect late SVD stages; diffusion MRI is sensitive to early changes.
  • Peak width of skeletonized mean diffusivity (PSMD) is an established diffusion MRI marker for SVD.

Purpose of the Study:

  • To develop an advanced diffusion MRI marker, PSMD-2, for longitudinal assessment of SVD.
  • To improve upon the existing PSMD marker for enhanced sensitivity and clinical trial utility.

Main Methods:

  • PSMD-2 was developed using free-water corrected diffusion maps and a common within-subject template.
  • The marker was tested on 120 familial SVD (CADASIL) subjects and validated in 17 CADASIL and 72 sporadic SVD patients.
  • Sample size estimations for clinical trials were compared between PSMD-2 and the conventional PSMD.

Main Results:

  • PSMD-2 effectively tracked disease progression across all study cohorts.
  • It demonstrated significant reductions in required sample sizes: 24.3% in the development dataset, 31.0% in validation CADASIL, and 18.6% in sporadic SVD.
  • Further validation in cerebral amyloid angiopathy (CAA) and reproducibility studies are underway.

Conclusions:

  • PSMD-2 offers superior sensitivity for detecting SVD-related brain changes compared to the original PSMD.
  • The marker's ability to reduce sample size makes it a valuable surrogate endpoint for SVD clinical trials.
  • PSMD-2 can aid in monitoring disease progression and assessing vascular brain changes in Alzheimer's disease.