{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:FXDAINDTHSA5CIW256PRLMKHEF","short_pith_number":"pith:FXDAINDT","canonical_record":{"source":{"id":"1908.07516","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-08-19T19:03:13Z","cross_cats_sorted":["cs.CV","physics.med-ph"],"title_canon_sha256":"279d5d8e7f7d12df5176ecd4b0a96dbcd5088aac33ca83e5c60d1a101915a717","abstract_canon_sha256":"83ff3ca57b26c7c37fc6e701fdf12f69fd50efe59aaa2d85679b939ed5657d0d"},"schema_version":"1.0"},"canonical_sha256":"2dc60434733c81d122daef9f15b1472144659cb907826e87e0016586f13b8394","source":{"kind":"arxiv","id":"1908.07516","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07516","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07516v4","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07516","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"pith_short_12","alias_value":"FXDAINDTHSA5","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"pith_short_16","alias_value":"FXDAINDTHSA5CIW2","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"pith_short_8","alias_value":"FXDAINDT","created_at":"2026-07-05T00:40:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:FXDAINDTHSA5CIW256PRLMKHEF","target":"record","payload":{"canonical_record":{"source":{"id":"1908.07516","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-08-19T19:03:13Z","cross_cats_sorted":["cs.CV","physics.med-ph"],"title_canon_sha256":"279d5d8e7f7d12df5176ecd4b0a96dbcd5088aac33ca83e5c60d1a101915a717","abstract_canon_sha256":"83ff3ca57b26c7c37fc6e701fdf12f69fd50efe59aaa2d85679b939ed5657d0d"},"schema_version":"1.0"},"canonical_sha256":"2dc60434733c81d122daef9f15b1472144659cb907826e87e0016586f13b8394","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:40:14.153157Z","signature_b64":"WctH5T9O/64TkpWweh8B9/Ojfb/BDiR+arNioFK7zmapV+GNcgUMYnq7KKxpcAS43jlbHk8gfmdg3mkDuVBCAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2dc60434733c81d122daef9f15b1472144659cb907826e87e0016586f13b8394","last_reissued_at":"2026-07-05T00:40:14.152768Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:40:14.152768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.07516","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:40:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jRPvckL1WMgF6cL1zomit0b/pp5PUWv7XDzPVvN+i8PeNCbcnlgckN9v9JtKo2eJDfkG/BArGMayWb+ex0YrBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T20:41:53.118937Z"},"content_sha256":"fd751a62403ed058a6bf7fb3cc2cce740c649d5ef62aa09035a2fc1f675ba4e8","schema_version":"1.0","event_id":"sha256:fd751a62403ed058a6bf7fb3cc2cce740c649d5ef62aa09035a2fc1f675ba4e8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:FXDAINDTHSA5CIW256PRLMKHEF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"DirectPET: Full Size Neural Network PET Reconstruction from Sinogram Data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CV","physics.med-ph"],"primary_cat":"eess.IV","authors_text":"Jens Gregor, William Whiteley, Wing K. Luk","submitted_at":"2019-08-19T19:03:13Z","abstract_excerpt":"Purpose: Neural network image reconstruction directly from measurement data is a relatively new field of research, that until now has been limited to producing small single-slice images (e.g., 1x128x128). This paper proposes a novel and more efficient network design for Positron Emission Tomography called DirectPET which is capable of reconstructing multi-slice image volumes (i.e., 16x400x400) from sinograms.\n  Approach: Large-scale direct neural network reconstruction is accomplished by addressing the associated memory space challenge through the introduction of a specially designed Radon inv"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07516","kind":"arxiv","version":4},"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/1908.07516/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":"2026-07-05T00:40:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"y11vkkHgEXqktUsFlYA/gdHqQEooaJGV73gVmj18H/KblOJRpnTAYNNSX7rWuI2WQ+ll1vacoaiLedLwcbXDBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T20:41:53.119442Z"},"content_sha256":"4c98498b34fb21d69e1166165b9b449144598f3a631cd0dfaae08ac77e0304b7","schema_version":"1.0","event_id":"sha256:4c98498b34fb21d69e1166165b9b449144598f3a631cd0dfaae08ac77e0304b7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FXDAINDTHSA5CIW256PRLMKHEF/bundle.json","state_url":"https://pith.science/pith/FXDAINDTHSA5CIW256PRLMKHEF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FXDAINDTHSA5CIW256PRLMKHEF/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":"2026-08-16T20:41:53Z","links":{"resolver":"https://pith.science/pith/FXDAINDTHSA5CIW256PRLMKHEF","bundle":"https://pith.science/pith/FXDAINDTHSA5CIW256PRLMKHEF/bundle.json","state":"https://pith.science/pith/FXDAINDTHSA5CIW256PRLMKHEF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FXDAINDTHSA5CIW256PRLMKHEF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:FXDAINDTHSA5CIW256PRLMKHEF","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":"83ff3ca57b26c7c37fc6e701fdf12f69fd50efe59aaa2d85679b939ed5657d0d","cross_cats_sorted":["cs.CV","physics.med-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-08-19T19:03:13Z","title_canon_sha256":"279d5d8e7f7d12df5176ecd4b0a96dbcd5088aac33ca83e5c60d1a101915a717"},"schema_version":"1.0","source":{"id":"1908.07516","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07516","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07516v4","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07516","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"pith_short_12","alias_value":"FXDAINDTHSA5","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"pith_short_16","alias_value":"FXDAINDTHSA5CIW2","created_at":"2026-07-05T00:40:14Z"},{"alias_kind":"pith_short_8","alias_value":"FXDAINDT","created_at":"2026-07-05T00:40:14Z"}],"graph_snapshots":[{"event_id":"sha256:4c98498b34fb21d69e1166165b9b449144598f3a631cd0dfaae08ac77e0304b7","target":"graph","created_at":"2026-07-05T00:40:14Z","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/1908.07516/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Purpose: Neural network image reconstruction directly from measurement data is a relatively new field of research, that until now has been limited to producing small single-slice images (e.g., 1x128x128). This paper proposes a novel and more efficient network design for Positron Emission Tomography called DirectPET which is capable of reconstructing multi-slice image volumes (i.e., 16x400x400) from sinograms.\n  Approach: Large-scale direct neural network reconstruction is accomplished by addressing the associated memory space challenge through the introduction of a specially designed Radon inv","authors_text":"Jens Gregor, William Whiteley, Wing K. Luk","cross_cats":["cs.CV","physics.med-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-08-19T19:03:13Z","title":"DirectPET: Full Size Neural Network PET Reconstruction from Sinogram Data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07516","kind":"arxiv","version":4},"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:fd751a62403ed058a6bf7fb3cc2cce740c649d5ef62aa09035a2fc1f675ba4e8","target":"record","created_at":"2026-07-05T00:40:14Z","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":"83ff3ca57b26c7c37fc6e701fdf12f69fd50efe59aaa2d85679b939ed5657d0d","cross_cats_sorted":["cs.CV","physics.med-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-08-19T19:03:13Z","title_canon_sha256":"279d5d8e7f7d12df5176ecd4b0a96dbcd5088aac33ca83e5c60d1a101915a717"},"schema_version":"1.0","source":{"id":"1908.07516","kind":"arxiv","version":4}},"canonical_sha256":"2dc60434733c81d122daef9f15b1472144659cb907826e87e0016586f13b8394","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2dc60434733c81d122daef9f15b1472144659cb907826e87e0016586f13b8394","first_computed_at":"2026-07-05T00:40:14.152768Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:40:14.152768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WctH5T9O/64TkpWweh8B9/Ojfb/BDiR+arNioFK7zmapV+GNcgUMYnq7KKxpcAS43jlbHk8gfmdg3mkDuVBCAA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:40:14.153157Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.07516","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fd751a62403ed058a6bf7fb3cc2cce740c649d5ef62aa09035a2fc1f675ba4e8","sha256:4c98498b34fb21d69e1166165b9b449144598f3a631cd0dfaae08ac77e0304b7"],"state_sha256":"7c7a5c95e5f744797ef455fc7b8bdf724e7cef144a82b99b542babf74b92122f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CeqOyz+j4ZGdA13FQtXBNHYqr3r3wMP8Bhek44HcnBd/BGfmnt8MGgtc+Dh63/Dpcu0dpVMYrxPv1nJYnMdAAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T20:41:53.124552Z","bundle_sha256":"07c104ff8e816df2777734076929df849edec521d6056d5fdc045eae4a7b90ca"}}