{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:IVMFMDHXIW2G4SWA5JGDW7UL25","short_pith_number":"pith:IVMFMDHX","canonical_record":{"source":{"id":"1909.10254","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-09-23T09:56:06Z","cross_cats_sorted":["eess.SP","physics.med-ph"],"title_canon_sha256":"d574549c8e82fe6c9b1bab005347bf05ed2cc285d738980e6405ef21e2500986","abstract_canon_sha256":"0aaa00e14f1422576190522bb7b2d608dd75a132aada07eaf4581c203914d363"},"schema_version":"1.0"},"canonical_sha256":"4558560cf745b46e4ac0ea4c3b7e8bd769e7a54cfabc0ccffae519c5f5b37579","source":{"kind":"arxiv","id":"1909.10254","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.10254","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"arxiv_version","alias_value":"1909.10254v1","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.10254","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_12","alias_value":"IVMFMDHXIW2G","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_16","alias_value":"IVMFMDHXIW2G4SWA","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_8","alias_value":"IVMFMDHX","created_at":"2026-07-05T00:25:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:IVMFMDHXIW2G4SWA5JGDW7UL25","target":"record","payload":{"canonical_record":{"source":{"id":"1909.10254","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-09-23T09:56:06Z","cross_cats_sorted":["eess.SP","physics.med-ph"],"title_canon_sha256":"d574549c8e82fe6c9b1bab005347bf05ed2cc285d738980e6405ef21e2500986","abstract_canon_sha256":"0aaa00e14f1422576190522bb7b2d608dd75a132aada07eaf4581c203914d363"},"schema_version":"1.0"},"canonical_sha256":"4558560cf745b46e4ac0ea4c3b7e8bd769e7a54cfabc0ccffae519c5f5b37579","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:25:28.569328Z","signature_b64":"iX9qF0SoXpyupE4o/uPXWxwIoNpIrQZmYAFAvNpFuI16sq9zXQneCJxEv6MUz6soQxqM/6EeMd/raW7fcTYoDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4558560cf745b46e4ac0ea4c3b7e8bd769e7a54cfabc0ccffae519c5f5b37579","last_reissued_at":"2026-07-05T00:25:28.568859Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:25:28.568859Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.10254","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":"2026-07-05T00:25:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j9MR9p5qR59kI1eXokhrm2DYbvEyz7yc+k1PNgtLS+ad6X/ntkfzM3rgHS7o4LIOFKm0EfGA/ta2eKG6NFn2Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T19:46:33.207236Z"},"content_sha256":"cac35c860ec0d4c875cb7ba8f37bad0c4821c8a5c4991a974f67279abd62ebe2","schema_version":"1.0","event_id":"sha256:cac35c860ec0d4c875cb7ba8f37bad0c4821c8a5c4991a974f67279abd62ebe2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:IVMFMDHXIW2G4SWA5JGDW7UL25","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultrasound Aberration Correction based on Local Speed-of-Sound Map Estimation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP","physics.med-ph"],"primary_cat":"eess.IV","authors_text":"Dieter Schweizer, Orcun Goksel, Richard Rau, Valery Vishnevskiy","submitted_at":"2019-09-23T09:56:06Z","abstract_excerpt":"For beamforming ultrasound (US) signals, typically a spatially constant speed-of-sound (SoS) is assumed to calculate delays. As SoS in tissue may vary relatively largely, this approximation may cause wavefront aberrations, thus degrading effective imaging resolution. In the literature, corrections have been proposed based on unidirectional SoS estimation or computationally-expensive a posteriori phase rectification. In this paper we demonstrate a direct delay correction approach for US beamforming, by leveraging 2D spatial SoS distribution estimates from plane-wave imaging. We show both in sim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.10254","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/1909.10254/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":"2026-07-05T00:25:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fW4hqbVB4Hbrlxe16O2QMgo6oivaDbhe1RZ4q6DhaEZ/rA/9Fg8/NOY7qoatoF04GLzFLRtOBkQMiuQjAJg/Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T19:46:33.208182Z"},"content_sha256":"c08dd6b07e40e19239e54cd4c04546f8f76374096da4fee82fd7dea340fded97","schema_version":"1.0","event_id":"sha256:c08dd6b07e40e19239e54cd4c04546f8f76374096da4fee82fd7dea340fded97"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IVMFMDHXIW2G4SWA5JGDW7UL25/bundle.json","state_url":"https://pith.science/pith/IVMFMDHXIW2G4SWA5JGDW7UL25/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IVMFMDHXIW2G4SWA5JGDW7UL25/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":"2026-08-03T19:46:33Z","links":{"resolver":"https://pith.science/pith/IVMFMDHXIW2G4SWA5JGDW7UL25","bundle":"https://pith.science/pith/IVMFMDHXIW2G4SWA5JGDW7UL25/bundle.json","state":"https://pith.science/pith/IVMFMDHXIW2G4SWA5JGDW7UL25/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IVMFMDHXIW2G4SWA5JGDW7UL25/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:IVMFMDHXIW2G4SWA5JGDW7UL25","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":"0aaa00e14f1422576190522bb7b2d608dd75a132aada07eaf4581c203914d363","cross_cats_sorted":["eess.SP","physics.med-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-09-23T09:56:06Z","title_canon_sha256":"d574549c8e82fe6c9b1bab005347bf05ed2cc285d738980e6405ef21e2500986"},"schema_version":"1.0","source":{"id":"1909.10254","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.10254","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"arxiv_version","alias_value":"1909.10254v1","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.10254","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_12","alias_value":"IVMFMDHXIW2G","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_16","alias_value":"IVMFMDHXIW2G4SWA","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_8","alias_value":"IVMFMDHX","created_at":"2026-07-05T00:25:28Z"}],"graph_snapshots":[{"event_id":"sha256:c08dd6b07e40e19239e54cd4c04546f8f76374096da4fee82fd7dea340fded97","target":"graph","created_at":"2026-07-05T00:25:28Z","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/1909.10254/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"For beamforming ultrasound (US) signals, typically a spatially constant speed-of-sound (SoS) is assumed to calculate delays. As SoS in tissue may vary relatively largely, this approximation may cause wavefront aberrations, thus degrading effective imaging resolution. In the literature, corrections have been proposed based on unidirectional SoS estimation or computationally-expensive a posteriori phase rectification. In this paper we demonstrate a direct delay correction approach for US beamforming, by leveraging 2D spatial SoS distribution estimates from plane-wave imaging. We show both in sim","authors_text":"Dieter Schweizer, Orcun Goksel, Richard Rau, Valery Vishnevskiy","cross_cats":["eess.SP","physics.med-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-09-23T09:56:06Z","title":"Ultrasound Aberration Correction based on Local Speed-of-Sound Map Estimation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.10254","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:cac35c860ec0d4c875cb7ba8f37bad0c4821c8a5c4991a974f67279abd62ebe2","target":"record","created_at":"2026-07-05T00:25:28Z","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":"0aaa00e14f1422576190522bb7b2d608dd75a132aada07eaf4581c203914d363","cross_cats_sorted":["eess.SP","physics.med-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-09-23T09:56:06Z","title_canon_sha256":"d574549c8e82fe6c9b1bab005347bf05ed2cc285d738980e6405ef21e2500986"},"schema_version":"1.0","source":{"id":"1909.10254","kind":"arxiv","version":1}},"canonical_sha256":"4558560cf745b46e4ac0ea4c3b7e8bd769e7a54cfabc0ccffae519c5f5b37579","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4558560cf745b46e4ac0ea4c3b7e8bd769e7a54cfabc0ccffae519c5f5b37579","first_computed_at":"2026-07-05T00:25:28.568859Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:25:28.568859Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iX9qF0SoXpyupE4o/uPXWxwIoNpIrQZmYAFAvNpFuI16sq9zXQneCJxEv6MUz6soQxqM/6EeMd/raW7fcTYoDw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:25:28.569328Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.10254","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cac35c860ec0d4c875cb7ba8f37bad0c4821c8a5c4991a974f67279abd62ebe2","sha256:c08dd6b07e40e19239e54cd4c04546f8f76374096da4fee82fd7dea340fded97"],"state_sha256":"b16e4c2688b770481f9316937f2641ed152f6a330e5b6097f9043a31e4e30111"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"711cycIjk8JNlNdBn1QJahYWoTbBVeDeXN2KJJ7shSSH6uK+f0+r0o4GCScSeiRNWklhqmUmP59Gpyvd2y3cDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T19:46:33.216329Z","bundle_sha256":"68af51da7b12f479a66fc3e9903d0f85501d81ee1b8b8b28d5e2badb7f05180a"}}