{"artifact_id":"L1-031","layer":"L1","title":"Planar X-ray Radiography","domain":"Medical Imaging","sub_domain":"Projection X-ray diagnostic imaging","physics_fingerprint":{"L_DAG":2.5,"title":"Planar X-ray Radiography","domain":"Medical Imaging","carrier":"x_ray","primitives":["L.xray_source","L.beer_lambert","int.spatial"],"sub_domain":"Projection X-ray diagnostic imaging","noise_model":"shot_poisson","problem_class":"linear_inverse","solution_space":"2D_attenuation_projection","difficulty_delta":3,"integration_axis":"spatial","sensing_mechanism":"xray_projection"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D attenuation projection 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 well-conditioned (kappa_eff ~= 8); scatter dominates the stability cliff; patient_motion and the remaining mismatch parameters contribute higher-order bias terms. Photon-shot-noise-limited (poisson counting) 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":3072,"W":3072,"kVp":80,"mAs":20,"scatter":0.0,"pixel_um":140,"patient_motion":0.0},"input_format":"measurement_only","problem_class":"xray_radiography","forward_operator":"xray_radiography_forward","epsilon_fn_center":"34.0"},"omega_bounds":{"H":[1024,4096],"W":[1024,4096],"kVp":[30,150],"mAs":[0.1,200],"scatter":[0.0,0.4],"pixel_um":[50,500],"tube_drift":[0.0,0.1],"patient_motion":[0.0,0.3],"anti_scatter_grid":[0.0,0.5]},"epsilon_bounds":{"psnr_db":[5.0,45.0]},"allowed_problem_classes":["xray_radiography"],"allowed_omega_dimensions":["H","W","kVp","mAs","pixel_um","scatter","patient_motion","scatter","patient_motion","anti_scatter_grid","tube_drift"],"allowed_forward_operators":["xray_radiography_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":160,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x53084c6e36f8b81280fe6f2ff4f6ec5554a9c02df044095bd7bf68cb077c9f1f","chain_tx_hash":"0xd414f0e303b7d08d47d0df33829ab71a29600c8ec547246d6647618d4e9dcd41","chain_block":41553371}