{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:2RP7GAD3ZUDO7SRXZB6W4G7E6M","short_pith_number":"pith:2RP7GAD3","canonical_record":{"source":{"id":"2501.05828","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CV","submitted_at":"2025-01-10T10:07:41Z","cross_cats_sorted":["cs.GR"],"title_canon_sha256":"100498161c380585ecaa5aae0f3bafbe0594b5a2aed1001dadd51def353fbcd7","abstract_canon_sha256":"d380aca16ab9d51878f4575a8a88dade5068d3aa8807855e9a438ae2ea84d3d5"},"schema_version":"1.0"},"canonical_sha256":"d45ff3007bcd06efca37c87d6e1be4f31145e62fca09cbe95280d0709bb0ebbe","source":{"kind":"arxiv","id":"2501.05828","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.05828","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"arxiv_version","alias_value":"2501.05828v3","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.05828","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_12","alias_value":"2RP7GAD3ZUDO","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_16","alias_value":"2RP7GAD3ZUDO7SRX","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_8","alias_value":"2RP7GAD3","created_at":"2026-07-05T11:59:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:2RP7GAD3ZUDO7SRXZB6W4G7E6M","target":"record","payload":{"canonical_record":{"source":{"id":"2501.05828","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CV","submitted_at":"2025-01-10T10:07:41Z","cross_cats_sorted":["cs.GR"],"title_canon_sha256":"100498161c380585ecaa5aae0f3bafbe0594b5a2aed1001dadd51def353fbcd7","abstract_canon_sha256":"d380aca16ab9d51878f4575a8a88dade5068d3aa8807855e9a438ae2ea84d3d5"},"schema_version":"1.0"},"canonical_sha256":"d45ff3007bcd06efca37c87d6e1be4f31145e62fca09cbe95280d0709bb0ebbe","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:59:56.702851Z","signature_b64":"sOB47hQ0pUvkw0uyTTJKzN/hTDhYu/co8qROXLYsoGRMeN4n4oKaLyg2+WetTnad5izInZrCs90AJGn2yL2hCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d45ff3007bcd06efca37c87d6e1be4f31145e62fca09cbe95280d0709bb0ebbe","last_reissued_at":"2026-07-05T11:59:56.702369Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:59:56.702369Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2501.05828","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:59:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Nxpw6HANWp2peZwmDxh7ob7oI0/PpVxmC0QPCaz4jTeMvOr4cCqb/8vzpSLKzBvmxfFvidVFC3KsWy5hs+1hCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T19:50:02.294739Z"},"content_sha256":"e124c20dd980cfc1579f9138104f22f1645bd28adf36961ec5ab724970e7d67a","schema_version":"1.0","event_id":"sha256:e124c20dd980cfc1579f9138104f22f1645bd28adf36961ec5ab724970e7d67a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:2RP7GAD3ZUDO7SRXZB6W4G7E6M","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"UltraRay: Introducing Full-Path Ray Tracing in Physics-Based Ultrasound Simulation","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["cs.GR"],"primary_cat":"cs.CV","authors_text":"Felix Duelmer, Magdalena Wysocki, Mohammad Farid Azampour, Nassir Navab","submitted_at":"2025-01-10T10:07:41Z","abstract_excerpt":"Traditional ultrasound simulators solve the wave equation to model pressure distribution fields, achieving high accuracy but requiring significant computational time and resources. To address this, ray tracing approaches have been introduced, modeling wave propagation as rays interacting with boundaries and scatterers. However, existing models simplify ray propagation, generating echoes at interaction points without considering return paths to the sensor. This can result in unrealistic artifacts and necessitates careful scene tuning for plausible results. We propose a novel ultrasound simulati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.05828","kind":"arxiv","version":3},"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/2501.05828/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":"2026-07-05T11:59:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lS3MdvTF25Yf6gjiLl9uOXIMa1iQjJZlvG/hG0Oj+5u0DnyDCcObVWKGj1S8E1AVPAFNRSa21tZ/eP9/c+0OBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T19:50:02.295761Z"},"content_sha256":"24405804ea34e9b962c43e844da4664da6d0fd9052f23170669e26d362505f58","schema_version":"1.0","event_id":"sha256:24405804ea34e9b962c43e844da4664da6d0fd9052f23170669e26d362505f58"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2RP7GAD3ZUDO7SRXZB6W4G7E6M/bundle.json","state_url":"https://pith.science/pith/2RP7GAD3ZUDO7SRXZB6W4G7E6M/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2RP7GAD3ZUDO7SRXZB6W4G7E6M/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":"2026-08-13T19:50:02Z","links":{"resolver":"https://pith.science/pith/2RP7GAD3ZUDO7SRXZB6W4G7E6M","bundle":"https://pith.science/pith/2RP7GAD3ZUDO7SRXZB6W4G7E6M/bundle.json","state":"https://pith.science/pith/2RP7GAD3ZUDO7SRXZB6W4G7E6M/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2RP7GAD3ZUDO7SRXZB6W4G7E6M/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:2RP7GAD3ZUDO7SRXZB6W4G7E6M","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":"d380aca16ab9d51878f4575a8a88dade5068d3aa8807855e9a438ae2ea84d3d5","cross_cats_sorted":["cs.GR"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CV","submitted_at":"2025-01-10T10:07:41Z","title_canon_sha256":"100498161c380585ecaa5aae0f3bafbe0594b5a2aed1001dadd51def353fbcd7"},"schema_version":"1.0","source":{"id":"2501.05828","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.05828","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"arxiv_version","alias_value":"2501.05828v3","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.05828","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_12","alias_value":"2RP7GAD3ZUDO","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_16","alias_value":"2RP7GAD3ZUDO7SRX","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_8","alias_value":"2RP7GAD3","created_at":"2026-07-05T11:59:56Z"}],"graph_snapshots":[{"event_id":"sha256:24405804ea34e9b962c43e844da4664da6d0fd9052f23170669e26d362505f58","target":"graph","created_at":"2026-07-05T11:59:56Z","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/2501.05828/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Traditional ultrasound simulators solve the wave equation to model pressure distribution fields, achieving high accuracy but requiring significant computational time and resources. To address this, ray tracing approaches have been introduced, modeling wave propagation as rays interacting with boundaries and scatterers. However, existing models simplify ray propagation, generating echoes at interaction points without considering return paths to the sensor. This can result in unrealistic artifacts and necessitates careful scene tuning for plausible results. We propose a novel ultrasound simulati","authors_text":"Felix Duelmer, Magdalena Wysocki, Mohammad Farid Azampour, Nassir Navab","cross_cats":["cs.GR"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CV","submitted_at":"2025-01-10T10:07:41Z","title":"UltraRay: Introducing Full-Path Ray Tracing in Physics-Based Ultrasound Simulation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.05828","kind":"arxiv","version":3},"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:e124c20dd980cfc1579f9138104f22f1645bd28adf36961ec5ab724970e7d67a","target":"record","created_at":"2026-07-05T11:59:56Z","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":"d380aca16ab9d51878f4575a8a88dade5068d3aa8807855e9a438ae2ea84d3d5","cross_cats_sorted":["cs.GR"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.CV","submitted_at":"2025-01-10T10:07:41Z","title_canon_sha256":"100498161c380585ecaa5aae0f3bafbe0594b5a2aed1001dadd51def353fbcd7"},"schema_version":"1.0","source":{"id":"2501.05828","kind":"arxiv","version":3}},"canonical_sha256":"d45ff3007bcd06efca37c87d6e1be4f31145e62fca09cbe95280d0709bb0ebbe","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d45ff3007bcd06efca37c87d6e1be4f31145e62fca09cbe95280d0709bb0ebbe","first_computed_at":"2026-07-05T11:59:56.702369Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:59:56.702369Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sOB47hQ0pUvkw0uyTTJKzN/hTDhYu/co8qROXLYsoGRMeN4n4oKaLyg2+WetTnad5izInZrCs90AJGn2yL2hCw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:59:56.702851Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.05828","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e124c20dd980cfc1579f9138104f22f1645bd28adf36961ec5ab724970e7d67a","sha256:24405804ea34e9b962c43e844da4664da6d0fd9052f23170669e26d362505f58"],"state_sha256":"baf94b1e0e73eeb61a70e05f3fb2f5a3544e6531d58aeefcaf223c07ae33c055"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XaACJq63XustUHXpj6d1MY3Sum3sZRtD3spiLbU2SQ+3kJbsZ3yNfUKYojq0fDsm4fzQIc6FTfWw6y/PQ7pFAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T19:50:02.332729Z","bundle_sha256":"f7df07d7949dcb65627150687d567f34d1bdc2c0e275eddbfd94b7f2dd7f0b12"}}