FLAIR Super-Resolution May Erase or Hallucinate Small White-Matter Lesions
A recent investigation published on arXiv (2608.06311) explores whether super-resolution (SR) techniques applied to FLAIR MRI scans maintain or alter small white-matter hyperintensities (WMH) associated with cerebrovascular conditions. Due to thick slices, FLAIR scans typically exhibit low resolution. The research involved analyzing high-resolution FLAIR scans with 1-mm isotropic resolution from 29 individuals in the ADNI cohort, where WMH were manually segmented. These scans were then downsampled to 3-mm and 5-mm resolutions. Three SR techniques were evaluated: multi-contrast implicit neural representation (INR), single-contrast self-supervised model (ECLARE), and cubic interpolation. Findings indicated that SR could either eliminate actual lesions or introduce false ones, affecting automated WMH segmentation in clinical practices, underscoring the necessity for validating SR methods prior to clinical application.
Key facts
- Study investigates super-resolution effects on white-matter hyperintensity (WMH) segmentation in FLAIR MRI scans.
- Used 1-mm isotropic high-resolution FLAIR scans from 29 individuals in the ADNI cohort.
- Scans were manually segmented for WMH by an expert.
- Degraded to simulated 3-mm and 5-mm through-plane acquisitions.
- Compared three SR methods: multi-contrast implicit neural representation (INR), ECLARE (single-contrast self-supervised), and cubic interpolation.
- Found that SR can erase small real lesions or hallucinate absent ones.
- Implications for clinical workflows relying on automated WMH segmentation.
- Paper available on arXiv with ID 2608.06311.
Entities
Institutions
- arXiv
- ADNI