{"artifact_id":"L1-059","layer":"L1","title":"Susceptibility-Weighted Imaging (SWI)","domain":"Medical Imaging","sub_domain":"T2*/phase venous and microbleed imaging","physics_fingerprint":{"L_DAG":3.3,"title":"Susceptibility-Weighted Imaging (SWI)","domain":"Medical Imaging","carrier":"radio_wave","primitives":["L.rf_excitation","L.gradient_echo","L.phase_mask","int.spatial"],"sub_domain":"T2*/phase venous and microbleed imaging","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"3D_susceptibility","difficulty_delta":3,"integration_axis":"spatial","sensing_mechanism":"mri_fourier_encoding"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 3D susceptibility 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 ~= 12); B0_inhomogeneity dominates the stability cliff; air_tissue_boundaries 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":64,"TE_ms":25,"SNR_dB":22,"phase_wrap":0.0,"B0_inhomogeneity":0.0,"coil_phase_error":0.0,"air_tissue_boundaries":0.0},"input_format":"measurement_only","problem_class":"swi","forward_operator":"swi_forward","epsilon_fn_center":"24.0"},"omega_bounds":{"H":128,"W":128,"Z":[16,256],"TE_ms":[10,80],"SNR_dB":[0.0,35.0],"phase_wrap":[0.0,0.3],"B0_inhomogeneity":[0.0,0.3],"coil_phase_error":[0.0,0.3],"air_tissue_boundaries":[0.0,0.5]},"epsilon_bounds":{"psnr_db":[5.0,45.0]},"allowed_problem_classes":["swi"],"allowed_omega_dimensions":["H","W","Z","TE_ms","SNR_dB","B0_inhomogeneity","air_tissue_boundaries","phase_wrap","coil_phase_error","B0_inhomogeneity","air_tissue_boundaries","phase_wrap","coil_phase_error"],"allowed_forward_operators":["swi_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":240,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x7c31accd30f1408fb0e3db6db812a0527d69b7e44555a513bf46669fca678c29","chain_tx_hash":"0x5cf36f36e62eb7f46881513bd99a522650d79ec98123d10b9b4e49699b92a342","chain_block":41553372}