{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:PUBDAQ4UY7Y3GCQWLSZL5WL5UD","short_pith_number":"pith:PUBDAQ4U","canonical_record":{"source":{"id":"1201.2450","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-01-12T00:25:00Z","cross_cats_sorted":[],"title_canon_sha256":"bd728557655537847b6beafbb7ef7741e7d299b236383171eaa961808bf57228","abstract_canon_sha256":"662bbad8c151ab31e99427016b7d4cf92452924c2d026be037eb03b9be7bb802"},"schema_version":"1.0"},"canonical_sha256":"7d02304394c7f1b30a165cb2bed97da0d93cd20a4482c7c2af26fd5c9563b477","source":{"kind":"arxiv","id":"1201.2450","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.2450","created_at":"2026-05-18T01:58:52Z"},{"alias_kind":"arxiv_version","alias_value":"1201.2450v1","created_at":"2026-05-18T01:58:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.2450","created_at":"2026-05-18T01:58:52Z"},{"alias_kind":"pith_short_12","alias_value":"PUBDAQ4UY7Y3","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"PUBDAQ4UY7Y3GCQW","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"PUBDAQ4U","created_at":"2026-05-18T12:27:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:PUBDAQ4UY7Y3GCQWLSZL5WL5UD","target":"record","payload":{"canonical_record":{"source":{"id":"1201.2450","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-01-12T00:25:00Z","cross_cats_sorted":[],"title_canon_sha256":"bd728557655537847b6beafbb7ef7741e7d299b236383171eaa961808bf57228","abstract_canon_sha256":"662bbad8c151ab31e99427016b7d4cf92452924c2d026be037eb03b9be7bb802"},"schema_version":"1.0"},"canonical_sha256":"7d02304394c7f1b30a165cb2bed97da0d93cd20a4482c7c2af26fd5c9563b477","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:52.430027Z","signature_b64":"nUSkALfBHBtAKGiisbEmIMsnXwzytjJqghtAvt/jUTUJqe3cecnPlxFqd0W972cgty+54DF0gQt9iCHDF8F1AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7d02304394c7f1b30a165cb2bed97da0d93cd20a4482c7c2af26fd5c9563b477","last_reissued_at":"2026-05-18T01:58:52.429336Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:52.429336Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1201.2450","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":"2026-05-18T01:58:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XlZzgoirbQC01P2AyEP2Y77LLXTZtmJQ+fdTz1O5m8hijTJNaZUJT1hVl+1P1nxev7/SLMy99Us/2/6xxV/aBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T02:47:14.439851Z"},"content_sha256":"927d02b57bf02cd0b4aa2eeb7beb555037b80df490c301320d7e460ca2e6aeae","schema_version":"1.0","event_id":"sha256:927d02b57bf02cd0b4aa2eeb7beb555037b80df490c301320d7e460ca2e6aeae"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:PUBDAQ4UY7Y3GCQWLSZL5WL5UD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Four-dimensional Cone Beam CT Reconstruction and Enhancement using a Temporal Non-Local Means Method","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Jan-Jakob Sonke, Steve B. Jiang, Xun Jia, Yifei Lou, Zhen Tian","submitted_at":"2012-01-12T00:25:00Z","abstract_excerpt":"Four-dimensional Cone Beam Computed Tomography (4D-CBCT) has been developed to provide respiratory phase resolved volumetric imaging in image guided radiation therapy (IGRT). Inadequate number of projections in each phase bin results in low quality 4D-CBCT images with obvious streaking artifacts. In this work, we propose two novel 4D-CBCT algorithms: an iterative reconstruction algorithm and an enhancement algorithm, utilizing a temporal nonlocal means (TNLM) method. We define a TNLM energy term for a given set of 4D-CBCT images. Minimization of this term favors those 4D-CBCT images such that "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.2450","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":""},"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":"2026-05-18T01:58:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bhiV5pXDNYpH6R5GNy/M6SCBsyy2EAANn7hlpx7dBeCAQEZoAEZPw3mhOPg4F4Bls+vqhS7DlYz67iCV1MIjAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T02:47:14.440522Z"},"content_sha256":"72a0ac27928fd7490bf65fcbd1585619a082e89dfe9ba2b22fbc57a065069f8a","schema_version":"1.0","event_id":"sha256:72a0ac27928fd7490bf65fcbd1585619a082e89dfe9ba2b22fbc57a065069f8a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PUBDAQ4UY7Y3GCQWLSZL5WL5UD/bundle.json","state_url":"https://pith.science/pith/PUBDAQ4UY7Y3GCQWLSZL5WL5UD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PUBDAQ4UY7Y3GCQWLSZL5WL5UD/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":"2026-05-26T02:47:14Z","links":{"resolver":"https://pith.science/pith/PUBDAQ4UY7Y3GCQWLSZL5WL5UD","bundle":"https://pith.science/pith/PUBDAQ4UY7Y3GCQWLSZL5WL5UD/bundle.json","state":"https://pith.science/pith/PUBDAQ4UY7Y3GCQWLSZL5WL5UD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PUBDAQ4UY7Y3GCQWLSZL5WL5UD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:PUBDAQ4UY7Y3GCQWLSZL5WL5UD","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":"662bbad8c151ab31e99427016b7d4cf92452924c2d026be037eb03b9be7bb802","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-01-12T00:25:00Z","title_canon_sha256":"bd728557655537847b6beafbb7ef7741e7d299b236383171eaa961808bf57228"},"schema_version":"1.0","source":{"id":"1201.2450","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.2450","created_at":"2026-05-18T01:58:52Z"},{"alias_kind":"arxiv_version","alias_value":"1201.2450v1","created_at":"2026-05-18T01:58:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.2450","created_at":"2026-05-18T01:58:52Z"},{"alias_kind":"pith_short_12","alias_value":"PUBDAQ4UY7Y3","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"PUBDAQ4UY7Y3GCQW","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"PUBDAQ4U","created_at":"2026-05-18T12:27:18Z"}],"graph_snapshots":[{"event_id":"sha256:72a0ac27928fd7490bf65fcbd1585619a082e89dfe9ba2b22fbc57a065069f8a","target":"graph","created_at":"2026-05-18T01:58:52Z","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"},"paper":{"abstract_excerpt":"Four-dimensional Cone Beam Computed Tomography (4D-CBCT) has been developed to provide respiratory phase resolved volumetric imaging in image guided radiation therapy (IGRT). Inadequate number of projections in each phase bin results in low quality 4D-CBCT images with obvious streaking artifacts. In this work, we propose two novel 4D-CBCT algorithms: an iterative reconstruction algorithm and an enhancement algorithm, utilizing a temporal nonlocal means (TNLM) method. We define a TNLM energy term for a given set of 4D-CBCT images. Minimization of this term favors those 4D-CBCT images such that ","authors_text":"Jan-Jakob Sonke, Steve B. Jiang, Xun Jia, Yifei Lou, Zhen Tian","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-01-12T00:25:00Z","title":"Four-dimensional Cone Beam CT Reconstruction and Enhancement using a Temporal Non-Local Means Method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.2450","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":"sha256:927d02b57bf02cd0b4aa2eeb7beb555037b80df490c301320d7e460ca2e6aeae","target":"record","created_at":"2026-05-18T01:58:52Z","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":"662bbad8c151ab31e99427016b7d4cf92452924c2d026be037eb03b9be7bb802","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-01-12T00:25:00Z","title_canon_sha256":"bd728557655537847b6beafbb7ef7741e7d299b236383171eaa961808bf57228"},"schema_version":"1.0","source":{"id":"1201.2450","kind":"arxiv","version":1}},"canonical_sha256":"7d02304394c7f1b30a165cb2bed97da0d93cd20a4482c7c2af26fd5c9563b477","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7d02304394c7f1b30a165cb2bed97da0d93cd20a4482c7c2af26fd5c9563b477","first_computed_at":"2026-05-18T01:58:52.429336Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:52.429336Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nUSkALfBHBtAKGiisbEmIMsnXwzytjJqghtAvt/jUTUJqe3cecnPlxFqd0W972cgty+54DF0gQt9iCHDF8F1AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:52.430027Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.2450","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:927d02b57bf02cd0b4aa2eeb7beb555037b80df490c301320d7e460ca2e6aeae","sha256:72a0ac27928fd7490bf65fcbd1585619a082e89dfe9ba2b22fbc57a065069f8a"],"state_sha256":"e51b738cfa07aaa376199f14309364dc316c728bb5909c68b8b402472f016809"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bxRwdsBvo6Y5dRlyj30TiP2QfVvHiL1zQCYRpVpqZWRIC3Uzlby9DcUY1LEcEKWsoqCh1POW5qKRzb6mSpZGDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T02:47:14.443989Z","bundle_sha256":"18aff7ceef657b45091419ffe39a848323c30aa08c2214895628849b5f88d1ae"}}