{"artifact_id":"L1-508","layer":"L1","title":"Optical Coherence Elastography (OCE)","domain":"Medical Imaging","sub_domain":"Sub-resolution displacement-tracked tissue mechanical property recovery (multi-physics joint inverse)","physics_fingerprint":{"L_DAG":8.4,"title":"Optical Coherence Elastography (OCE)","domain":"Medical Imaging","carrier":"photon_with_mechanical_load","primitives":["L.oct_acquisition","L.phase_extraction","L.displacement_tracking","L.elasticity_wave","L.constitutive_law","L.applied_loading","int.spatial","int.temporal"],"sub_domain":"Sub-resolution displacement-tracked tissue mechanical property recovery (multi-physics joint inverse)","noise_model":"gaussian","problem_class":"nonlinear_inverse","solution_space":"3D_lame_parameter_map","difficulty_delta":5,"integration_axis":"spatial_temporal","sensing_mechanism":"phase_sensitive_oct_with_elasticity_wave"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of recovered Lame parameter maps (mu, lambda)(r) is guaranteed within the declared Omega bounds. Uniqueness holds for shear-wave-mode loading at multiple frequencies (2D-3D shear-wave dispersion analysis); compression-mode and surface-wave OCE are conditionally unique requiring boundary-condition specification and density assumption. Stability is moderately conditioned (kappa_eff ~ 35 after physics-informed wave-equation regularization) — oct_phase_noise dominates displacement-tracking precision; tissue_anisotropy contributes off-diagonal Lame-tensor bias; density_uncertainty contributes a scaling factor of order rho^(-1/2). Joint Hadamard well-posedness for the coupled OCT-elasticity forward is established by Schmitt 1998 (foundational), Wang-Kirkpatrick-Hinds 2007 (phase-sensitive OCE), Kennedy-Wijesinghe-Sampson 2014 (compression OCE), Larin-Sampson 2017 (review), Kirby et al. 2017 (shear-wave OCE methods), and Wijesinghe et al. 2019 (computational OCE).","secondary":"RMSE_log_modulus"},"size_tiers":{"center_spec":{"omega":{"H":512,"W":512,"Z":256,"SNR_dB":25,"N_frames":100,"loading_mode":"shear_wave","wavelength_nm":1300,"oct_phase_noise":0.0,"loading_amplitude":1e-07,"tissue_anisotropy":0.0,"axial_resolution_um":10,"density_uncertainty":0.0,"loading_frequency_Hz":1000,"lateral_resolution_um":15,"scatter_decorrelation":0.0,"loading_calibration_error":0.0,"boundary_condition_uncertainty":0.0},"input_format":"phase_resolved_oct_under_loading","problem_class":"oce_shear_wave","forward_operator":"oce_joint_forward","epsilon_fn_center":"24.0"},"omega_bounds":{"H":[128,2048],"W":[128,2048],"Z":[64,1024],"SNR_dB":[5.0,40.0],"N_frames":[10,1000],"wavelength_nm":[800,1700],"oct_phase_noise":[0.0,0.3],"loading_amplitude":[1e-09,0.0001],"tissue_anisotropy":[0.0,0.4],"axial_resolution_um":[1,50],"density_uncertainty":[0.0,0.2],"loading_frequency_Hz":[10,20000],"lateral_resolution_um":[2,50],"scatter_decorrelation":[0.0,0.4],"loading_calibration_error":[0.0,0.3],"boundary_condition_uncertainty":[0.0,0.3]},"epsilon_bounds":{"psnr_db":[8.0,42.0]},"allowed_problem_classes":["oce_shear_wave","oce_compression","oce_acoustic_radiation_force","oce_surface_wave","oce_natural_frequency"],"allowed_omega_dimensions":["H","W","Z","N_frames","axial_resolution_um","lateral_resolution_um","loading_mode","loading_amplitude","loading_frequency_Hz","wavelength_nm","SNR_dB","oct_phase_noise","scatter_decorrelation","loading_calibration_error","tissue_anisotropy","density_uncertainty","boundary_condition_uncertainty"],"allowed_forward_operators":["oce_joint_forward","oce_compression_forward","oce_shear_wave_forward","oce_arf_forward","oce_surface_wave_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":250,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x1eb90e1a535c5f6a2303cfe383613dd03b4fcefd22920aa0128c23ba2fc2207e","chain_tx_hash":"0x6ed0c8272521e923e97f12b2a4fcc23a6b91eced8fa9a77aa67a0071fe517008","chain_block":41553373}