{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:5FMZCRAZKCBNRSIJR3A3C73NZH","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":"3611c51f45e94ab4c336ab43b9d169c387ede4147fded93a59f591b9cbcf24c5","cross_cats_sorted":["cs.CV","stat.ML"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2017-12-17T23:07:35Z","title_canon_sha256":"0f4863f8fb654d705a483cfd91a9b835d835c010b4ac933b745c02aa348fbf29"},"schema_version":"1.0","source":{"id":"1712.06203","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1712.06203","created_at":"2026-05-18T00:09:27Z"},{"alias_kind":"arxiv_version","alias_value":"1712.06203v2","created_at":"2026-05-18T00:09:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1712.06203","created_at":"2026-05-18T00:09:27Z"},{"alias_kind":"pith_short_12","alias_value":"5FMZCRAZKCBN","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"5FMZCRAZKCBNRSIJ","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"5FMZCRAZ","created_at":"2026-05-18T12:31:00Z"}],"graph_snapshots":[{"event_id":"sha256:b5a6d9ae919aacfbe24573cc383479addd97537011fdcc2020f1db118afe19c3","target":"graph","created_at":"2026-05-18T00:09:27Z","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":"Positron Emission Tomography (PET) is a functional imaging modality widely used in neuroscience studies. To obtain meaningful quantitative results from PET images, attenuation correction is necessary during image reconstruction. For PET/MR hybrid systems, PET attenuation is challenging as Magnetic Resonance (MR) images do not reflect attenuation coefficients directly. To address this issue, we present deep neural network methods to derive the continuous attenuation coefficients for brain PET imaging from MR images. With only Dixon MR images as the network input, the existing U-net structure wa","authors_text":"Georges El Fakhri, Jaewon Yang, Kuang Gong, Kyungsang Kim, Quanzheng Li, Youngho Seo","cross_cats":["cs.CV","stat.ML"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2017-12-17T23:07:35Z","title":"Attenuation correction for brain PET imaging using deep neural network based on dixon and ZTE MR images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.06203","kind":"arxiv","version":2},"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":"sha256:4da557a84165dd938455007dbdae365375b997321f11e5ae581f49c1f1241934","target":"record","created_at":"2026-05-18T00:09:27Z","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":"3611c51f45e94ab4c336ab43b9d169c387ede4147fded93a59f591b9cbcf24c5","cross_cats_sorted":["cs.CV","stat.ML"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2017-12-17T23:07:35Z","title_canon_sha256":"0f4863f8fb654d705a483cfd91a9b835d835c010b4ac933b745c02aa348fbf29"},"schema_version":"1.0","source":{"id":"1712.06203","kind":"arxiv","version":2}},"canonical_sha256":"e9599144195082d8c9098ec1b17f6dc9cb502200cecf327907cd6204fc55c6a9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e9599144195082d8c9098ec1b17f6dc9cb502200cecf327907cd6204fc55c6a9","first_computed_at":"2026-05-18T00:09:27.726206Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:09:27.726206Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hFoTBB9TFANOhB9s4tw00+R364IJVZ5K8ePFB808xwUvPUVvBeT5Rk1civPmc1E4gaSeEBW5tJFQJTExuYb4Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:09:27.726760Z","signed_message":"canonical_sha256_bytes"},"source_id":"1712.06203","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4da557a84165dd938455007dbdae365375b997321f11e5ae581f49c1f1241934","sha256:b5a6d9ae919aacfbe24573cc383479addd97537011fdcc2020f1db118afe19c3"],"state_sha256":"a6ef9b6d8bb27f2126ace866d9ed3dabe9bd706aae10d289dc361b64db77e738"}