{"artifact_id":"L1-065","layer":"L1","title":"Functional Near-Infrared Spectroscopy (fNIRS)","domain":"Medical Imaging","sub_domain":"Wearable NIR hemodynamic brain monitoring","physics_fingerprint":{"L_DAG":3.5,"title":"Functional Near-Infrared Spectroscopy (fNIRS)","domain":"Medical Imaging","carrier":"photon","primitives":["L.nir_source","L.diffusion_propagation","D.nir_detector","int.temporal"],"sub_domain":"Wearable NIR hemodynamic brain monitoring","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"2D_brain_hbt_dynamics","difficulty_delta":5,"integration_axis":"temporal","sensing_mechanism":"near_infrared_diffusion"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D brain hbt dynamics is guaranteed within the declared Omega bounds. Uniqueness holds on the measurement-supported subspace; out-of-support modes are controlled by the declared priors. Stability is moderately conditioned (kappa_eff ~= 14); scalp_blood_flow_contamination dominates the stability cliff; motion and the remaining mismatch parameters contribute higher-order bias terms. Additive gaussian thermal/electronic noise sets the irreducible data-fidelity floor, while mild Tikhonov or analytic inversion is sufficient at the nominal Omega point.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"SNR_dB":20,"motion":0.0,"N_sources":16,"lambda_nm":[760,850],"N_detectors":16,"sampling_Hz":10,"ambient_light":0.0,"optode_coupling":1.0,"scalp_blood_flow_contamination":0.0},"input_format":"measurement_only","problem_class":"fnirs","forward_operator":"fnirs_forward","epsilon_fn_center":"18.0"},"omega_bounds":{"SNR_dB":[0.0,35.0],"motion":[0.0,0.5],"N_sources":[4,128],"N_detectors":[4,128],"sampling_Hz":[1,100],"ambient_light":[0.0,0.3],"optode_coupling":[0.3,1.0],"scalp_blood_flow_contamination":[0.0,0.5]},"epsilon_bounds":{"psnr_db":[5.0,45.0]},"allowed_problem_classes":["fnirs"],"allowed_omega_dimensions":["N_sources","N_detectors","lambda_nm","sampling_Hz","SNR_dB","scalp_blood_flow_contamination","motion","optode_coupling","ambient_light","scalp_blood_flow_contamination","motion","optode_coupling","ambient_light"],"allowed_forward_operators":["fnirs_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":280,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xc4a6b1fbbbcd64467eb4307fba13ce02574d34192ce2a2e8d911a768e7dccce2","chain_tx_hash":"0x5ce8c4393b083051f2123d64bb6899c0e9c1aac48912f60c1383f319dc66f4e3","chain_block":41552303}