Deep Dive: How ZODIAC Fills the Gaps in Intra-operative Spinal Ultrasound
maier_ak · x · 2026-09-08
Andreas Maier's long-form piece explains ZODIAC. Surgeons increasingly rely on real-time ultrasound in spinal procedures (no radiation, cheap), but bone is a near-perfect sound reflector: each vertebra casts a deep acoustic shadow, leaving a bright thin shell on B-mode and disjoint fragments instead of a navigable 3-D spine. Recovering the full lumbar shape is an ill-posed inverse problem — the missing data is a systematic absence caused by acoustic occlusion and limited probe angles, not filterable noise. Prior supervised approaches train on synthetic CT-derived "broken" scans and fail when simulated breakage doesn't match reality; ZODIAC instead learns a zero-shot diffusion prior of healthy spines.
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