{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:WM63EAXK4X77PRIR7Y6OZAAFKQ","short_pith_number":"pith:WM63EAXK","canonical_record":{"source":{"id":"2509.07128","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-09-08T18:29:15Z","cross_cats_sorted":["eess.IV","eess.SP"],"title_canon_sha256":"315f830838cff7b16fd4f3310de9d44a6de346e287c8ee1b8e499dca7dae77dd","abstract_canon_sha256":"271ff2aa4342027938a4efebd0ae1b17aded0e892f2987a1794530457f90a7f5"},"schema_version":"1.0"},"canonical_sha256":"b33db202eae5fff7c511fe3cec80055425b6872d8756380c89b68504cb08fa92","source":{"kind":"arxiv","id":"2509.07128","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.07128","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"arxiv_version","alias_value":"2509.07128v1","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.07128","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"pith_short_12","alias_value":"WM63EAXK4X77","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"pith_short_16","alias_value":"WM63EAXK4X77PRIR","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"pith_short_8","alias_value":"WM63EAXK","created_at":"2026-07-05T12:07:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:WM63EAXK4X77PRIR7Y6OZAAFKQ","target":"record","payload":{"canonical_record":{"source":{"id":"2509.07128","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-09-08T18:29:15Z","cross_cats_sorted":["eess.IV","eess.SP"],"title_canon_sha256":"315f830838cff7b16fd4f3310de9d44a6de346e287c8ee1b8e499dca7dae77dd","abstract_canon_sha256":"271ff2aa4342027938a4efebd0ae1b17aded0e892f2987a1794530457f90a7f5"},"schema_version":"1.0"},"canonical_sha256":"b33db202eae5fff7c511fe3cec80055425b6872d8756380c89b68504cb08fa92","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:07:16.031007Z","signature_b64":"aTNQUVHwmKUANxrf64zmoJbY0Vh321NNSCT8Y65kTFdW0MJO9+LOV5hCO6pcTQlqRT47pGFLKfy795nCpZRSCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b33db202eae5fff7c511fe3cec80055425b6872d8756380c89b68504cb08fa92","last_reissued_at":"2026-07-05T12:07:16.030441Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:07:16.030441Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2509.07128","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T12:07:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8De2uYL3UqoA5f0JMTHdNNbJcy4s4fc730ulk+Q7fHRccep4TxZR57Y74hqtHCrJQ4ei00Q84vX5xRONC68fDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T15:15:58.249934Z"},"content_sha256":"5cbf4560121f1507f910eceaa3555349012aae7a79eaedfbf329febda0b6d221","schema_version":"1.0","event_id":"sha256:5cbf4560121f1507f910eceaa3555349012aae7a79eaedfbf329febda0b6d221"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:WM63EAXK4X77PRIR7Y6OZAAFKQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Contrast-Free Ultrasound Microvascular Imaging via Radiality and Similarity Weighting","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.IV","eess.SP"],"primary_cat":"physics.med-ph","authors_text":"Andrew J. Bentall, Chengwu Huang, James D Krier, Jingke Zhang, Jingyi Yin, Kaipeng Ji, Kate M. Knoll, Kathryn A. Robinson, Kendra E. Petersen, Lijie Huang, Lilach O Lerman, Ryan M DeRuiter, Shigao Chen, Tao Wu, U-Wai Lok, Xiang-yang Zhu, Yanzhe Zhao","submitted_at":"2025-09-08T18:29:15Z","abstract_excerpt":"Microvascular imaging has advanced significantly with ultrafast data acquisition and improved clutter filtering, enhancing the sensitivity of power Doppler imaging to small vessels. However, the image quality remains limited by spatial resolution and elevated background noise, both of which impede visualization and accurate quantification. To address these limitations, this study proposes a high-resolution cross-correlation Power Doppler (HR-XPD) method that integrates spatial radiality weighting with Doppler signal coherence analysis, thereby enhancing spatial resolution while suppressing art"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.07128","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2509.07128/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T12:07:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rssLOpePjOp6qmhiDle9lizAxhhNxFV70rpNo1j+4R1Z9F+xpnTBY2sTu6sGpA98PAbq7WY2PjIaCPbqyOipDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T15:15:58.250240Z"},"content_sha256":"d981265b5490bb1d250d6fb40035977343a51d3e54b911fcfb9fdee7934064ea","schema_version":"1.0","event_id":"sha256:d981265b5490bb1d250d6fb40035977343a51d3e54b911fcfb9fdee7934064ea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WM63EAXK4X77PRIR7Y6OZAAFKQ/bundle.json","state_url":"https://pith.science/pith/WM63EAXK4X77PRIR7Y6OZAAFKQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WM63EAXK4X77PRIR7Y6OZAAFKQ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-31T15:15:58Z","links":{"resolver":"https://pith.science/pith/WM63EAXK4X77PRIR7Y6OZAAFKQ","bundle":"https://pith.science/pith/WM63EAXK4X77PRIR7Y6OZAAFKQ/bundle.json","state":"https://pith.science/pith/WM63EAXK4X77PRIR7Y6OZAAFKQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WM63EAXK4X77PRIR7Y6OZAAFKQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:WM63EAXK4X77PRIR7Y6OZAAFKQ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"271ff2aa4342027938a4efebd0ae1b17aded0e892f2987a1794530457f90a7f5","cross_cats_sorted":["eess.IV","eess.SP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-09-08T18:29:15Z","title_canon_sha256":"315f830838cff7b16fd4f3310de9d44a6de346e287c8ee1b8e499dca7dae77dd"},"schema_version":"1.0","source":{"id":"2509.07128","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.07128","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"arxiv_version","alias_value":"2509.07128v1","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.07128","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"pith_short_12","alias_value":"WM63EAXK4X77","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"pith_short_16","alias_value":"WM63EAXK4X77PRIR","created_at":"2026-07-05T12:07:16Z"},{"alias_kind":"pith_short_8","alias_value":"WM63EAXK","created_at":"2026-07-05T12:07:16Z"}],"graph_snapshots":[{"event_id":"sha256:d981265b5490bb1d250d6fb40035977343a51d3e54b911fcfb9fdee7934064ea","target":"graph","created_at":"2026-07-05T12:07:16Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2509.07128/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Microvascular imaging has advanced significantly with ultrafast data acquisition and improved clutter filtering, enhancing the sensitivity of power Doppler imaging to small vessels. However, the image quality remains limited by spatial resolution and elevated background noise, both of which impede visualization and accurate quantification. To address these limitations, this study proposes a high-resolution cross-correlation Power Doppler (HR-XPD) method that integrates spatial radiality weighting with Doppler signal coherence analysis, thereby enhancing spatial resolution while suppressing art","authors_text":"Andrew J. Bentall, Chengwu Huang, James D Krier, Jingke Zhang, Jingyi Yin, Kaipeng Ji, Kate M. Knoll, Kathryn A. Robinson, Kendra E. Petersen, Lijie Huang, Lilach O Lerman, Ryan M DeRuiter, Shigao Chen, Tao Wu, U-Wai Lok, Xiang-yang Zhu, Yanzhe Zhao","cross_cats":["eess.IV","eess.SP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-09-08T18:29:15Z","title":"Contrast-Free Ultrasound Microvascular Imaging via Radiality and Similarity Weighting"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.07128","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:5cbf4560121f1507f910eceaa3555349012aae7a79eaedfbf329febda0b6d221","target":"record","created_at":"2026-07-05T12:07:16Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"271ff2aa4342027938a4efebd0ae1b17aded0e892f2987a1794530457f90a7f5","cross_cats_sorted":["eess.IV","eess.SP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-09-08T18:29:15Z","title_canon_sha256":"315f830838cff7b16fd4f3310de9d44a6de346e287c8ee1b8e499dca7dae77dd"},"schema_version":"1.0","source":{"id":"2509.07128","kind":"arxiv","version":1}},"canonical_sha256":"b33db202eae5fff7c511fe3cec80055425b6872d8756380c89b68504cb08fa92","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b33db202eae5fff7c511fe3cec80055425b6872d8756380c89b68504cb08fa92","first_computed_at":"2026-07-05T12:07:16.030441Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T12:07:16.030441Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aTNQUVHwmKUANxrf64zmoJbY0Vh321NNSCT8Y65kTFdW0MJO9+LOV5hCO6pcTQlqRT47pGFLKfy795nCpZRSCA==","signature_status":"signed_v1","signed_at":"2026-07-05T12:07:16.031007Z","signed_message":"canonical_sha256_bytes"},"source_id":"2509.07128","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5cbf4560121f1507f910eceaa3555349012aae7a79eaedfbf329febda0b6d221","sha256:d981265b5490bb1d250d6fb40035977343a51d3e54b911fcfb9fdee7934064ea"],"state_sha256":"9a7ea5d54046e5a4d36fe4af20ed84d6174c1c6c8208a29f0026b7262c67cfaa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o89+zpeYfHCxFCl6sVScjkjrdscvtJAHiqsWklrhSNRhUJE7YK6cuk1oGaQxnq8lyyyMtwCZXzcB0uOOKbouDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T15:15:58.253031Z","bundle_sha256":"4ec42884507a2a411653b8f221bf82e8789be98a5dae6a9cd39e436c40e394d8"}}