{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:DF66UF7CW2H5YAIWK2EGM7RYBM","short_pith_number":"pith:DF66UF7C","canonical_record":{"source":{"id":"2110.04143","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-10-07T09:46:36Z","cross_cats_sorted":[],"title_canon_sha256":"1d5e5e557b4766f255a007e82d48991af7f97bb8dae2f289baebd392afa96d66","abstract_canon_sha256":"dfb74769b65a38b6aa91571258716f53bfcf6bbc432623d6edf4c9d7399a513d"},"schema_version":"1.0"},"canonical_sha256":"197dea17e2b68fdc01165688667e380b3c625a802e1e98d5e0b0eccd1f8abf4b","source":{"kind":"arxiv","id":"2110.04143","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.04143","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"arxiv_version","alias_value":"2110.04143v1","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.04143","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"pith_short_12","alias_value":"DF66UF7CW2H5","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"pith_short_16","alias_value":"DF66UF7CW2H5YAIW","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"pith_short_8","alias_value":"DF66UF7C","created_at":"2026-07-05T03:21:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:DF66UF7CW2H5YAIWK2EGM7RYBM","target":"record","payload":{"canonical_record":{"source":{"id":"2110.04143","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-10-07T09:46:36Z","cross_cats_sorted":[],"title_canon_sha256":"1d5e5e557b4766f255a007e82d48991af7f97bb8dae2f289baebd392afa96d66","abstract_canon_sha256":"dfb74769b65a38b6aa91571258716f53bfcf6bbc432623d6edf4c9d7399a513d"},"schema_version":"1.0"},"canonical_sha256":"197dea17e2b68fdc01165688667e380b3c625a802e1e98d5e0b0eccd1f8abf4b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:21:01.526384Z","signature_b64":"54ITOYw976+gcbRbk2TSBZzgKOLBZqkjOfAaepsR/1V+xSKbdIPP0EfX+bWR054IOVf2RzkMGHRQXmJYlOQJDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"197dea17e2b68fdc01165688667e380b3c625a802e1e98d5e0b0eccd1f8abf4b","last_reissued_at":"2026-07-05T03:21:01.525952Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:21:01.525952Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2110.04143","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":"2026-07-05T03:21:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8ZA60K8W2YSN2QFJh8y5/e9s12vacOay0IuR3qQ05gMUeSgwfbr4uDEFxaqkk+OeJyr9qycJz1AGHL4WKC7EDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-18T13:08:55.352942Z"},"content_sha256":"79f56d4fcb1fe78e190e88f75bd26ede47ab93c125f3a85ea5fd1e8e556d833d","schema_version":"1.0","event_id":"sha256:79f56d4fcb1fe78e190e88f75bd26ede47ab93c125f3a85ea5fd1e8e556d833d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:DF66UF7CW2H5YAIWK2EGM7RYBM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Proceedings of the 16th Virtual International Meeting on Fully 3D Image Reconstruction in Radiology and Nuclear Medicine","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Ahmadreza Rezaei, Georg Schramm, Johan Nuyts, Kris Thielemans","submitted_at":"2021-10-07T09:46:36Z","abstract_excerpt":"These proceedings contain the presented papers at the 16th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine 2021, which was to be held in Leuven, Belgium, but had to be transformed in a virtual meeting because of the covid-19 pandemic. Fully3D is one of the major forums for presentation of new results in the field of 3D image reconstruction, primarily with applications in x-ray computer tomography, PET and SPECT. Over the life-time of the meeting the focus has shifted to reflect recent developments in the field. Many of the major developme"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.04143","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/2110.04143/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":"2026-07-05T03:21:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MzDNgd/BXAzxiAw4xN1nSvRlythVzxHZ3lNtx93r6Xm+O2rv4PqhErm2ehlgu1emfnBV2rUmkHW3v6kNcp1LCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-18T13:08:55.353303Z"},"content_sha256":"a8773b8afa6040ede370c082466fda965dbaea9fc714a7bf40f4b8c0629def90","schema_version":"1.0","event_id":"sha256:a8773b8afa6040ede370c082466fda965dbaea9fc714a7bf40f4b8c0629def90"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DF66UF7CW2H5YAIWK2EGM7RYBM/bundle.json","state_url":"https://pith.science/pith/DF66UF7CW2H5YAIWK2EGM7RYBM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DF66UF7CW2H5YAIWK2EGM7RYBM/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":"2026-07-18T13:08:55Z","links":{"resolver":"https://pith.science/pith/DF66UF7CW2H5YAIWK2EGM7RYBM","bundle":"https://pith.science/pith/DF66UF7CW2H5YAIWK2EGM7RYBM/bundle.json","state":"https://pith.science/pith/DF66UF7CW2H5YAIWK2EGM7RYBM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DF66UF7CW2H5YAIWK2EGM7RYBM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:DF66UF7CW2H5YAIWK2EGM7RYBM","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":"dfb74769b65a38b6aa91571258716f53bfcf6bbc432623d6edf4c9d7399a513d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-10-07T09:46:36Z","title_canon_sha256":"1d5e5e557b4766f255a007e82d48991af7f97bb8dae2f289baebd392afa96d66"},"schema_version":"1.0","source":{"id":"2110.04143","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.04143","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"arxiv_version","alias_value":"2110.04143v1","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.04143","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"pith_short_12","alias_value":"DF66UF7CW2H5","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"pith_short_16","alias_value":"DF66UF7CW2H5YAIW","created_at":"2026-07-05T03:21:01Z"},{"alias_kind":"pith_short_8","alias_value":"DF66UF7C","created_at":"2026-07-05T03:21:01Z"}],"graph_snapshots":[{"event_id":"sha256:a8773b8afa6040ede370c082466fda965dbaea9fc714a7bf40f4b8c0629def90","target":"graph","created_at":"2026-07-05T03:21:01Z","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/2110.04143/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"These proceedings contain the presented papers at the 16th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine 2021, which was to be held in Leuven, Belgium, but had to be transformed in a virtual meeting because of the covid-19 pandemic. Fully3D is one of the major forums for presentation of new results in the field of 3D image reconstruction, primarily with applications in x-ray computer tomography, PET and SPECT. Over the life-time of the meeting the focus has shifted to reflect recent developments in the field. Many of the major developme","authors_text":"Ahmadreza Rezaei, Georg Schramm, Johan Nuyts, Kris Thielemans","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-10-07T09:46:36Z","title":"Proceedings of the 16th Virtual International Meeting on Fully 3D Image Reconstruction in Radiology and Nuclear Medicine"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.04143","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":"sha256:79f56d4fcb1fe78e190e88f75bd26ede47ab93c125f3a85ea5fd1e8e556d833d","target":"record","created_at":"2026-07-05T03:21:01Z","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":"dfb74769b65a38b6aa91571258716f53bfcf6bbc432623d6edf4c9d7399a513d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-10-07T09:46:36Z","title_canon_sha256":"1d5e5e557b4766f255a007e82d48991af7f97bb8dae2f289baebd392afa96d66"},"schema_version":"1.0","source":{"id":"2110.04143","kind":"arxiv","version":1}},"canonical_sha256":"197dea17e2b68fdc01165688667e380b3c625a802e1e98d5e0b0eccd1f8abf4b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"197dea17e2b68fdc01165688667e380b3c625a802e1e98d5e0b0eccd1f8abf4b","first_computed_at":"2026-07-05T03:21:01.525952Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:21:01.525952Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"54ITOYw976+gcbRbk2TSBZzgKOLBZqkjOfAaepsR/1V+xSKbdIPP0EfX+bWR054IOVf2RzkMGHRQXmJYlOQJDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:21:01.526384Z","signed_message":"canonical_sha256_bytes"},"source_id":"2110.04143","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:79f56d4fcb1fe78e190e88f75bd26ede47ab93c125f3a85ea5fd1e8e556d833d","sha256:a8773b8afa6040ede370c082466fda965dbaea9fc714a7bf40f4b8c0629def90"],"state_sha256":"1a11ac2888d8e3c5bc1cfe801bdeaf456863e3e7519c39031e1a122ef623ebbf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cVeQZMkzQDYF7BO1GEVxFbXgwHgSbml3EFuaR3eTy4bS3jHIPsj8rP0z2wGDbQx+qq67bQkTwluLcHN6jsSdCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-18T13:08:55.355800Z","bundle_sha256":"4942da88956bce292d3eef8cc911753d8e9647d77d08637020581ee247743270"}}