{"artifact_id":"L1-029","layer":"L1","title":"Computed Tomography (CT) — fan/cone-beam X-ray reconstruction","domain":"Medical Imaging","sub_domain":"Multi-angle X-ray tomographic imaging","physics_fingerprint":{"L_DAG":3.8,"title":"Computed Tomography (CT) — fan/cone-beam X-ray reconstruction","domain":"Medical Imaging","carrier":"x_ray","primitives":["L.xray_source","S.scan.angular","L.beer_lambert","L.backproject","int.angular"],"sub_domain":"Multi-angle X-ray tomographic imaging","noise_model":"shot_poisson","problem_class":"linear_inverse","solution_space":"3D_attenuation","difficulty_delta":5,"integration_axis":"angular","sensing_mechanism":"xray_ct"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 3D attenuation 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 ~= 18); beam_hardening dominates the stability cliff; scatter and the remaining mismatch parameters contribute higher-order bias terms. Photon-shot-noise-limited (poisson counting) sets the irreducible data-fidelity floor, while TV / wavelet-sparsity / deep priors stabilise recovery at the ill-conditioned end of Omega.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"H":512,"W":512,"Z":256,"kVp":120,"mAs":200,"scatter":0.0,"pixel_mm":0.5,"N_projections":720,"beam_hardening":0.0,"patient_motion":0.0},"input_format":"measurement_only","problem_class":"ct","forward_operator":"ct_forward","epsilon_fn_center":"32.0"},"omega_bounds":{"H":[256,2048],"W":[256,2048],"Z":[32,4096],"kVp":[60,140],"mAs":[1,1000],"scatter":[0.0,0.3],"pixel_mm":[0.1,5.0],"truncation":[0.0,0.2],"N_projections":[60,2880],"beam_hardening":[0.0,0.3],"metal_artifact":[0.0,0.5],"patient_motion":[0.0,0.3]},"epsilon_bounds":{"psnr_db":[5.0,45.0]},"allowed_problem_classes":["ct"],"allowed_omega_dimensions":["H","W","Z","N_projections","kVp","mAs","pixel_mm","beam_hardening","scatter","patient_motion","beam_hardening","scatter","patient_motion","truncation","metal_artifact"],"allowed_forward_operators":["ct_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":360,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x2b6738af2abc49d87290e62682eb7c8eedddfd08d121b696601a4af8c13c5e0c","chain_tx_hash":"0x71f1b68c3ddd1a8995ffd8d557eb9f991cedefc97cade68b8d2261945b189473","chain_block":41552300}