{"artifact_id":"L1-052","layer":"L1","title":"Brachytherapy Dose Imaging","domain":"Medical Imaging","sub_domain":"Sealed-source close-range radiotherapy dose","physics_fingerprint":{"L_DAG":3.2,"title":"Brachytherapy Dose Imaging","domain":"Medical Imaging","carrier":"photon","primitives":["L.sealed_gamma_source","L.inverse_square_decay","int.spatial"],"sub_domain":"Sealed-source close-range radiotherapy dose","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"3D_dose_distribution","difficulty_delta":3,"integration_axis":"spatial","sensing_mechanism":"brachytherapy_dose"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 3D dose distribution 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 ~= 10); source_position_error dominates the stability cliff; tissue_heterogeneity 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":128,"SNR_dB":30,"N_sources":20,"applicator_motion":0.0,"tissue_heterogeneity":0.05,"source_position_error":0.0,"inter_source_shielding":0.0},"input_format":"measurement_only","problem_class":"brachytherapy","forward_operator":"brachytherapy_forward","epsilon_fn_center":"26.0"},"omega_bounds":{"H":128,"W":128,"Z":[32,512],"SNR_dB":[15.0,40.0],"N_sources":[1,100],"applicator_motion":[0.0,3.0],"tissue_heterogeneity":[0.0,0.3],"source_position_error":[0.0,3.0],"inter_source_shielding":[0.0,0.3]},"epsilon_bounds":{"psnr_db":[5.0,45.0]},"allowed_problem_classes":["brachytherapy"],"allowed_omega_dimensions":["H","W","Z","N_sources","SNR_dB","source_position_error","tissue_heterogeneity","inter_source_shielding","applicator_motion","source_position_error","tissue_heterogeneity","inter_source_shielding","applicator_motion"],"allowed_forward_operators":["brachytherapy_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":200,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x2cd9e3e7a6e5c0552a4dff75b2e087f4c04267894a9e40b85c5a655c075f2695","chain_tx_hash":"0xcb383f9ba0b815746310aeba284073d60ee5f5a8d89ee7d7dc601b8442600839","chain_block":41553386}