{"artifact_id":"L1-156","layer":"L1","title":"PET-CT Fusion (metabolism + anatomy)","domain":"Multimodal Fusion","sub_domain":"Hybrid anatomical/functional diagnostic imaging","physics_fingerprint":{"L_DAG":3.5,"title":"PET-CT Fusion (metabolism + anatomy)","domain":"Multimodal Fusion","carrier":"photon","primitives":["L.ct_attenuation_map","L.pet_activity_map","L.registration","int.spatial"],"sub_domain":"Hybrid anatomical/functional diagnostic imaging","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"3D_fused_anatomical_functional","difficulty_delta":3,"integration_axis":"spatial","sensing_mechanism":"pet_ct_fusion"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 3D fused anatomical functional 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); registration_error dominates the stability cliff; breathing_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":{"H":256,"W":256,"Z":200,"SNR_dB":25,"breathing_motion":0.0,"temporal_mismatch":0.0,"registration_error":0.0,"attenuation_correction_bias":0.0},"input_format":"measurement_only","problem_class":"pet_ct_fusion","forward_operator":"pet_ct_fusion_forward","epsilon_fn_center":"26.0"},"omega_bounds":{"H":128,"W":128,"Z":[32,512],"SNR_dB":[0.0,35.0],"breathing_motion":[0.0,10.0],"temporal_mismatch":[0.0,3600],"registration_error":[0.0,5.0],"attenuation_correction_bias":[0.0,0.2]},"epsilon_bounds":{"psnr_db":[5.0,40.0]},"allowed_problem_classes":["pet_ct_fusion"],"allowed_omega_dimensions":["H","W","Z","registration_error","breathing_motion","attenuation_correction_bias","temporal_mismatch","SNR_dB","registration_error","breathing_motion","attenuation_correction_bias","temporal_mismatch"],"allowed_forward_operators":["pet_ct_fusion_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"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":"0xc97553b1b9c382ebc6df6d0f6bc01ed133d728e5604658a5a1d2f5e031680183","chain_tx_hash":"0xb9fff2a4049f0f8f82a35127f94d8dc02f0a6a8d1152a01e9a075574f2b6971b","chain_block":41554241}