Image-Domain Poisson-Perturbation Robustness of NCCT Slice Classification
Image-domain Poisson perturbation may alter normalized NCCT appearance and downstream models. We evaluated classification of ischemic core/penumbra-bearing non-contrast CT (NCCT) slices under five simulated settings. The source cohort was CPAISD (112 hyperacute ischemic stroke patients); the test partition contained 10 patients and 809 slices. First, a fixed-checkpoint audit compared direct ResNet-18 classification (P1) with residual U-Net denoising followed by the classifier (P2). P1 average precision (AP) ranged from 0.694 to 0.901, whereas P2 AP ranged from 0.509 to 0.797 (substantially lower at settings 10-40). The fixed 0.5 threshold had 0-12.8% sensitivity for P1 and 0% for P2. Seco...
| Authors | Rhea Ghosal, Ronok Ghosal, Eileen Lou |
|---|---|
| Primary category | cs.CV |
| Published | 24 March 2026 |
| Last updated at source | 1 October 2026 |
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