{"artifact_id":"L1-063","layer":"L1","title":"Digital Breast Tomosynthesis (DBT)","domain":"Medical Imaging","sub_domain":"Limited-angle tomography of the breast","physics_fingerprint":{"L_DAG":3.8,"title":"Digital Breast Tomosynthesis (DBT)","domain":"Medical Imaging","carrier":"x_ray","primitives":["L.xray_source","S.scan.limited_angle","L.sart_reconstruct","int.angular"],"sub_domain":"Limited-angle tomography of the breast","noise_model":"shot_poisson","problem_class":"linear_inverse","solution_space":"3D_attenuation_limited_angle","difficulty_delta":5,"integration_axis":"angular","sensing_mechanism":"xray_ct"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 3D attenuation limited angle 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); limited_angle_artifacts 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":3328,"W":2560,"Z":60,"kVp":28,"mAs":60,"scatter":0.15,"pixel_um":85,"N_projections":15,"patient_motion":0.0,"tilt_range_deg":15,"compression_variation":0.0,"limited_angle_artifacts":0.3},"input_format":"measurement_only","problem_class":"dbt","forward_operator":"dbt_forward","epsilon_fn_center":"27.0"},"omega_bounds":{"H":1664,"W":1280,"Z":[16,200],"kVp":[22,34],"mAs":[10,400],"scatter":[0.0,0.3],"pixel_um":[50,200],"N_projections":[9,25],"patient_motion":[0.0,0.3],"tilt_range_deg":[7.5,30],"compression_variation":[0.0,0.2],"limited_angle_artifacts":[0.1,0.7]},"epsilon_bounds":{"psnr_db":[5.0,45.0]},"allowed_problem_classes":["dbt"],"allowed_omega_dimensions":["H","W","Z","N_projections","tilt_range_deg","kVp","mAs","pixel_um","limited_angle_artifacts","scatter","compression_variation","patient_motion","limited_angle_artifacts","scatter","compression_variation","patient_motion"],"allowed_forward_operators":["dbt_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":"0x474b716b33bc75c4888fb038fc166b96487641a2f5f5f5ac9c4e33187eb94927","chain_tx_hash":"0xa0078995185ac02bd42d72717bde04a4112362140797523c8aa33acca2287903","chain_block":41553372}