Across ten frozen 3D CT encoders, a finding's detectability is governed by its contrast and spatial extent, not the model choice, and small low-contrast lesions remain undetectable even with linear probing.
In: 2026 IEEE 23rd International Symposium on Biomedical Imaging (ISBI)
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Big, Bright, or Invisible: A Frozen-Feature Benchmark of 3D CT Foundation Models
Across ten frozen 3D CT encoders, a finding's detectability is governed by its contrast and spatial extent, not the model choice, and small low-contrast lesions remain undetectable even with linear probing.