{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:JOGB6U5ZJBUCQ3TJIMGNBLLQ2R","short_pith_number":"pith:JOGB6U5Z","canonical_record":{"source":{"id":"2003.06934","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2020-03-15T21:56:34Z","cross_cats_sorted":[],"title_canon_sha256":"318c37891973a23c472fa52e67c02de6286892186f76f3badf577230ec90a3f6","abstract_canon_sha256":"154ba13e724a46d3f739aa0eb06591fa2ad97d8e3a7ea52692f48c3c82c3183d"},"schema_version":"1.0"},"canonical_sha256":"4b8c1f53b94868286e69430cd0ad70d44194e0b819a65355a269ac781ab2ad02","source":{"kind":"arxiv","id":"2003.06934","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.06934","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"arxiv_version","alias_value":"2003.06934v1","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.06934","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"pith_short_12","alias_value":"JOGB6U5ZJBUC","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"pith_short_16","alias_value":"JOGB6U5ZJBUCQ3TJ","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"pith_short_8","alias_value":"JOGB6U5Z","created_at":"2026-07-05T00:48:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:JOGB6U5ZJBUCQ3TJIMGNBLLQ2R","target":"record","payload":{"canonical_record":{"source":{"id":"2003.06934","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2020-03-15T21:56:34Z","cross_cats_sorted":[],"title_canon_sha256":"318c37891973a23c472fa52e67c02de6286892186f76f3badf577230ec90a3f6","abstract_canon_sha256":"154ba13e724a46d3f739aa0eb06591fa2ad97d8e3a7ea52692f48c3c82c3183d"},"schema_version":"1.0"},"canonical_sha256":"4b8c1f53b94868286e69430cd0ad70d44194e0b819a65355a269ac781ab2ad02","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:48:07.839216Z","signature_b64":"jX+2HaK5kzwFelALQWVeAWXLBZcBBaJ12pAwXJBIbHSbZMgpF/gL/XqW8AaO/gIRX+7/PfB11W/ZBwemv6CTAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4b8c1f53b94868286e69430cd0ad70d44194e0b819a65355a269ac781ab2ad02","last_reissued_at":"2026-07-05T00:48:07.838775Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:48:07.838775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2003.06934","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":"2026-07-05T00:48:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"woutKREGlAeC+O4GYwIzLreiU6xHFcDEPa4SbS9Cdc8QXSsiojN+qDwxGIvrPtp+yledIjPr7UrAohXZzU3UBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T21:26:19.046885Z"},"content_sha256":"09622d9dbe727211458b539c721a55568f94f82e15a4d1c418dd3fef98b8e313","schema_version":"1.0","event_id":"sha256:09622d9dbe727211458b539c721a55568f94f82e15a4d1c418dd3fef98b8e313"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:JOGB6U5ZJBUCQ3TJIMGNBLLQ2R","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultrasound imaging of the human body with three dimensional full-wave nonlinear acoustics. Part 1: simulations methods","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Gianmarco Pinton","submitted_at":"2020-03-15T21:56:34Z","abstract_excerpt":"Simulations of three dimensional ultrasound propagation in heterogeneous media are computationally intensive due to the constraints arising from the large size of the domain, which is on the order of hundreds of wavelengths, and the small size of scatterers, which are much smaller than a wavelength. Consequently, three dimensional ultrasound imaging simulations are currently based on models that simplify the propagation physics. Here the full three dimensional wave physics is simulated with finite differences to generate ultrasound images of the human body based directly on the first principle"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.06934","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/2003.06934/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":"2026-07-05T00:48:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zXB98nrBH9js6JsH+VfSaAvLRsJO3cXhwsOnP/MYUBpIhpyY8KrTtQ2GqyDWdxrFi7vRF6/4fQ1J2/Xz5t5NAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T21:26:19.047959Z"},"content_sha256":"16cab47860e3917fc4a02d56adbce84475b66655f7201da111c6c4d44a1e1974","schema_version":"1.0","event_id":"sha256:16cab47860e3917fc4a02d56adbce84475b66655f7201da111c6c4d44a1e1974"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JOGB6U5ZJBUCQ3TJIMGNBLLQ2R/bundle.json","state_url":"https://pith.science/pith/JOGB6U5ZJBUCQ3TJIMGNBLLQ2R/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JOGB6U5ZJBUCQ3TJIMGNBLLQ2R/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":"2026-08-14T21:26:19Z","links":{"resolver":"https://pith.science/pith/JOGB6U5ZJBUCQ3TJIMGNBLLQ2R","bundle":"https://pith.science/pith/JOGB6U5ZJBUCQ3TJIMGNBLLQ2R/bundle.json","state":"https://pith.science/pith/JOGB6U5ZJBUCQ3TJIMGNBLLQ2R/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JOGB6U5ZJBUCQ3TJIMGNBLLQ2R/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:JOGB6U5ZJBUCQ3TJIMGNBLLQ2R","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":"154ba13e724a46d3f739aa0eb06591fa2ad97d8e3a7ea52692f48c3c82c3183d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2020-03-15T21:56:34Z","title_canon_sha256":"318c37891973a23c472fa52e67c02de6286892186f76f3badf577230ec90a3f6"},"schema_version":"1.0","source":{"id":"2003.06934","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.06934","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"arxiv_version","alias_value":"2003.06934v1","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.06934","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"pith_short_12","alias_value":"JOGB6U5ZJBUC","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"pith_short_16","alias_value":"JOGB6U5ZJBUCQ3TJ","created_at":"2026-07-05T00:48:07Z"},{"alias_kind":"pith_short_8","alias_value":"JOGB6U5Z","created_at":"2026-07-05T00:48:07Z"}],"graph_snapshots":[{"event_id":"sha256:16cab47860e3917fc4a02d56adbce84475b66655f7201da111c6c4d44a1e1974","target":"graph","created_at":"2026-07-05T00:48:07Z","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/2003.06934/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Simulations of three dimensional ultrasound propagation in heterogeneous media are computationally intensive due to the constraints arising from the large size of the domain, which is on the order of hundreds of wavelengths, and the small size of scatterers, which are much smaller than a wavelength. Consequently, three dimensional ultrasound imaging simulations are currently based on models that simplify the propagation physics. Here the full three dimensional wave physics is simulated with finite differences to generate ultrasound images of the human body based directly on the first principle","authors_text":"Gianmarco Pinton","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2020-03-15T21:56:34Z","title":"Ultrasound imaging of the human body with three dimensional full-wave nonlinear acoustics. Part 1: simulations methods"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.06934","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":"sha256:09622d9dbe727211458b539c721a55568f94f82e15a4d1c418dd3fef98b8e313","target":"record","created_at":"2026-07-05T00:48:07Z","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":"154ba13e724a46d3f739aa0eb06591fa2ad97d8e3a7ea52692f48c3c82c3183d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2020-03-15T21:56:34Z","title_canon_sha256":"318c37891973a23c472fa52e67c02de6286892186f76f3badf577230ec90a3f6"},"schema_version":"1.0","source":{"id":"2003.06934","kind":"arxiv","version":1}},"canonical_sha256":"4b8c1f53b94868286e69430cd0ad70d44194e0b819a65355a269ac781ab2ad02","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4b8c1f53b94868286e69430cd0ad70d44194e0b819a65355a269ac781ab2ad02","first_computed_at":"2026-07-05T00:48:07.838775Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:48:07.838775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jX+2HaK5kzwFelALQWVeAWXLBZcBBaJ12pAwXJBIbHSbZMgpF/gL/XqW8AaO/gIRX+7/PfB11W/ZBwemv6CTAA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:48:07.839216Z","signed_message":"canonical_sha256_bytes"},"source_id":"2003.06934","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:09622d9dbe727211458b539c721a55568f94f82e15a4d1c418dd3fef98b8e313","sha256:16cab47860e3917fc4a02d56adbce84475b66655f7201da111c6c4d44a1e1974"],"state_sha256":"e1a140de3365070a245dddf3d2c77ae7b073cab2ca28e849f552d2333a82a031"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1cRaxsmoCUSeraVni4KqEs/6+HZAN0/CvJEiURFASQVuVKOs6uVvSKBzvosf4PU1VBG6Xjfsj9kLWNH84h9bDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T21:26:19.054489Z","bundle_sha256":"46a4aa917e9ba4c2207dff495d5ec62d2fb344e603f2aa6cc9e735c30fa2b9f2"}}