{"artifact_id":"L1-061","layer":"L1","title":"Intravascular Ultrasound (IVUS)","domain":"Medical Imaging","sub_domain":"Catheter-based high-frequency ultrasound of coronary arteries","physics_fingerprint":{"L_DAG":3.8,"title":"Intravascular Ultrasound (IVUS)","domain":"Medical Imaging","carrier":"acoustic","primitives":["L.emit.acoustic_pulse_40MHz","L.catheter_rotate","L.pulse_echo","int.temporal"],"sub_domain":"Catheter-based high-frequency ultrasound of coronary arteries","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"2D_vessel_cross_section","difficulty_delta":5,"integration_axis":"temporal","sensing_mechanism":"intravascular_ultrasound"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D vessel cross section 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 ~= 13); catheter_motion dominates the stability cliff; non_uniform_rotation 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":40,"SNR_dB":25,"N_lines":256,"depth_mm":8,"blood_speckle":0.1,"catheter_motion":0.0,"guidewire_artifact":0.0,"non_uniform_rotation":0.0},"input_format":"measurement_only","problem_class":"ivus","forward_operator":"ivus_forward","epsilon_fn_center":"24.0"},"omega_bounds":{"f_MHz":[20,60],"SNR_dB":[0.0,40.0],"N_lines":[64,1024],"depth_mm":[2,20],"blood_speckle":[0.0,0.3],"catheter_motion":[0.0,0.5],"guidewire_artifact":[0.0,0.3],"non_uniform_rotation":[0.0,0.3]},"epsilon_bounds":{"psnr_db":[5.0,45.0]},"allowed_problem_classes":["ivus"],"allowed_omega_dimensions":["N_lines","f_MHz","depth_mm","SNR_dB","catheter_motion","non_uniform_rotation","guidewire_artifact","blood_speckle","catheter_motion","non_uniform_rotation","guidewire_artifact","blood_speckle"],"allowed_forward_operators":["ivus_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":260,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xd77a0c70a7c0ddf54cffec7f004fea7d31c4f5e2b3fdddb734d84807e9e46cd3","chain_tx_hash":"0x79e52b1fb82037a8fbb2353bc90197a0dfec2717838a1e5d62275f0abeee8e2d","chain_block":41552303}