{"artifact_id":"L1-032","layer":"L1","title":"Clinical B-mode Ultrasound","domain":"Medical Imaging","sub_domain":"Pulse-echo diagnostic ultrasound","physics_fingerprint":{"L_DAG":3.5,"title":"Clinical B-mode Ultrasound","domain":"Medical Imaging","carrier":"acoustic","primitives":["L.emit.acoustic_pulse","S.scan.beam","L.beamform","L.envelope_detect","int.temporal"],"sub_domain":"Pulse-echo diagnostic ultrasound","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"2D_acoustic_reflectivity","difficulty_delta":3,"integration_axis":"temporal","sensing_mechanism":"pulse_echo_ultrasound"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D acoustic reflectivity 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); acoustic_attenuation dominates the stability cliff; speed_of_sound_error 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":{"f_MHz":5,"SNR_dB":25,"N_lines":256,"depth_cm":15,"shadowing":0.0,"N_elements":128,"acoustic_attenuation":0.5,"speed_of_sound_error":0.0},"input_format":"measurement_only","problem_class":"clinical_ultrasound","forward_operator":"clinical_ultrasound_forward","epsilon_fn_center":"28.0"},"omega_bounds":{"f_MHz":[1,30],"SNR_dB":[0.0,40.0],"N_lines":[64,1024],"depth_cm":[1,30],"shadowing":[0.0,0.5],"N_elements":[32,512],"reverberation":[0.0,0.3],"probe_pressure":[0.0,0.3],"acoustic_attenuation":[0.1,1.5],"speed_of_sound_error":[0.0,0.05]},"epsilon_bounds":{"psnr_db":[5.0,45.0]},"allowed_problem_classes":["clinical_ultrasound"],"allowed_omega_dimensions":["N_elements","N_lines","f_MHz","depth_cm","SNR_dB","acoustic_attenuation","speed_of_sound_error","shadowing","acoustic_attenuation","speed_of_sound_error","shadowing","reverberation","probe_pressure"],"allowed_forward_operators":["clinical_ultrasound_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":"0xd9bf19b3fdc56a80e3b82a2ccb83b4a5b3824ea54bd6ad3322cec67b532a57cb","chain_tx_hash":"0x10936c80aee816a718793d0a1ebd44d1badaa3f7be594cf2774b8d5d81d21a6f","chain_block":41553385}