{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:MEZGNZHXBHQOUCTBZYPVSPIG77","short_pith_number":"pith:MEZGNZHX","canonical_record":{"source":{"id":"2304.07588","kind":"arxiv","version":10},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2023-04-15T16:07:31Z","cross_cats_sorted":["eess.IV"],"title_canon_sha256":"3575b23ccbf8b99352ff17232c53c1f583263c6aeb5817c0e77012f4d84d2b30","abstract_canon_sha256":"75f48391fbaa97d4fc7a97e227eb71bd86d4c72e6526bbafbe674cf4f4d01071"},"schema_version":"1.0"},"canonical_sha256":"613266e4f709e0ea0a61ce1f593d06ffe89cf0602086a5d8941e02d30957e438","source":{"kind":"arxiv","id":"2304.07588","version":10},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.07588","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"arxiv_version","alias_value":"2304.07588v10","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.07588","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"pith_short_12","alias_value":"MEZGNZHXBHQO","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"pith_short_16","alias_value":"MEZGNZHXBHQOUCTB","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"pith_short_8","alias_value":"MEZGNZHX","created_at":"2026-07-05T10:32:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:MEZGNZHXBHQOUCTBZYPVSPIG77","target":"record","payload":{"canonical_record":{"source":{"id":"2304.07588","kind":"arxiv","version":10},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2023-04-15T16:07:31Z","cross_cats_sorted":["eess.IV"],"title_canon_sha256":"3575b23ccbf8b99352ff17232c53c1f583263c6aeb5817c0e77012f4d84d2b30","abstract_canon_sha256":"75f48391fbaa97d4fc7a97e227eb71bd86d4c72e6526bbafbe674cf4f4d01071"},"schema_version":"1.0"},"canonical_sha256":"613266e4f709e0ea0a61ce1f593d06ffe89cf0602086a5d8941e02d30957e438","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:32:23.072463Z","signature_b64":"gE/7Z8LQ+pZT6CeGGXsOI17ltaxRnomUaAQjEgsgClPGfO/oZWCmBfSE/MUVXXFltAjKxqGSrvekXHcVSHEIDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"613266e4f709e0ea0a61ce1f593d06ffe89cf0602086a5d8941e02d30957e438","last_reissued_at":"2026-07-05T10:32:23.071876Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:32:23.071876Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2304.07588","source_version":10,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:32:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8ZyeoWpCzTFR1gS4D7XGzPSE7q0iHChjtTWjPJXMQIA5q76kmiXTi4chYQe/x1anwmD1qHnnPrXtxejHlg+vAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T07:14:17.741808Z"},"content_sha256":"38c72b4441a2e3df44cb02bb40b877e3b90875d85714a3bbe52122af06d1fcc8","schema_version":"1.0","event_id":"sha256:38c72b4441a2e3df44cb02bb40b877e3b90875d85714a3bbe52122af06d1fcc8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:MEZGNZHXBHQOUCTBZYPVSPIG77","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Systematic Review on Learning-based Spectral CT","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["eess.IV"],"primary_cat":"physics.med-ph","authors_text":"Alessandro Perelli, Alexandre Bousse, Ge Wang, Guobao Wang, Jian Zhou, Mengzhou Li, Simon Rit, Venkata Sai Sundar Kandarpa","submitted_at":"2023-04-15T16:07:31Z","abstract_excerpt":"Spectral computed tomography (CT) has recently emerged as an advanced version of medical CT and significantly improves conventional (single-energy) CT. Spectral CT has two main forms: dual-energy computed tomography (DECT) and photon-counting computed tomography (PCCT), which offer image improvement, material decomposition, and feature quantification relative to conventional CT. However, the inherent challenges of spectral CT, evidenced by data and image artifacts, remain a bottleneck for clinical applications. To address these problems, machine learning techniques have been widely applied to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.07588","kind":"arxiv","version":10},"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/2304.07588/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":"2026-07-05T10:32:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"12upvU07Y8aMqRJMOg7pbrb+nZQcyMzKyxyI5hZLEQ8ITsmqgvS8m0vvvvbsA7DBJ7GzpJnD+eQhm7J7WMjaCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T07:14:17.742790Z"},"content_sha256":"434cafd1ba332613da83d4db6da483a6fbce9582bdbcd42674bf0023ab5a90d0","schema_version":"1.0","event_id":"sha256:434cafd1ba332613da83d4db6da483a6fbce9582bdbcd42674bf0023ab5a90d0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MEZGNZHXBHQOUCTBZYPVSPIG77/bundle.json","state_url":"https://pith.science/pith/MEZGNZHXBHQOUCTBZYPVSPIG77/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MEZGNZHXBHQOUCTBZYPVSPIG77/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":"2026-08-05T07:14:17Z","links":{"resolver":"https://pith.science/pith/MEZGNZHXBHQOUCTBZYPVSPIG77","bundle":"https://pith.science/pith/MEZGNZHXBHQOUCTBZYPVSPIG77/bundle.json","state":"https://pith.science/pith/MEZGNZHXBHQOUCTBZYPVSPIG77/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MEZGNZHXBHQOUCTBZYPVSPIG77/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:MEZGNZHXBHQOUCTBZYPVSPIG77","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":"75f48391fbaa97d4fc7a97e227eb71bd86d4c72e6526bbafbe674cf4f4d01071","cross_cats_sorted":["eess.IV"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2023-04-15T16:07:31Z","title_canon_sha256":"3575b23ccbf8b99352ff17232c53c1f583263c6aeb5817c0e77012f4d84d2b30"},"schema_version":"1.0","source":{"id":"2304.07588","kind":"arxiv","version":10}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.07588","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"arxiv_version","alias_value":"2304.07588v10","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.07588","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"pith_short_12","alias_value":"MEZGNZHXBHQO","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"pith_short_16","alias_value":"MEZGNZHXBHQOUCTB","created_at":"2026-07-05T10:32:23Z"},{"alias_kind":"pith_short_8","alias_value":"MEZGNZHX","created_at":"2026-07-05T10:32:23Z"}],"graph_snapshots":[{"event_id":"sha256:434cafd1ba332613da83d4db6da483a6fbce9582bdbcd42674bf0023ab5a90d0","target":"graph","created_at":"2026-07-05T10:32:23Z","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/2304.07588/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Spectral computed tomography (CT) has recently emerged as an advanced version of medical CT and significantly improves conventional (single-energy) CT. Spectral CT has two main forms: dual-energy computed tomography (DECT) and photon-counting computed tomography (PCCT), which offer image improvement, material decomposition, and feature quantification relative to conventional CT. However, the inherent challenges of spectral CT, evidenced by data and image artifacts, remain a bottleneck for clinical applications. To address these problems, machine learning techniques have been widely applied to ","authors_text":"Alessandro Perelli, Alexandre Bousse, Ge Wang, Guobao Wang, Jian Zhou, Mengzhou Li, Simon Rit, Venkata Sai Sundar Kandarpa","cross_cats":["eess.IV"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2023-04-15T16:07:31Z","title":"Systematic Review on Learning-based Spectral CT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.07588","kind":"arxiv","version":10},"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":"sha256:38c72b4441a2e3df44cb02bb40b877e3b90875d85714a3bbe52122af06d1fcc8","target":"record","created_at":"2026-07-05T10:32:23Z","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":"75f48391fbaa97d4fc7a97e227eb71bd86d4c72e6526bbafbe674cf4f4d01071","cross_cats_sorted":["eess.IV"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2023-04-15T16:07:31Z","title_canon_sha256":"3575b23ccbf8b99352ff17232c53c1f583263c6aeb5817c0e77012f4d84d2b30"},"schema_version":"1.0","source":{"id":"2304.07588","kind":"arxiv","version":10}},"canonical_sha256":"613266e4f709e0ea0a61ce1f593d06ffe89cf0602086a5d8941e02d30957e438","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"613266e4f709e0ea0a61ce1f593d06ffe89cf0602086a5d8941e02d30957e438","first_computed_at":"2026-07-05T10:32:23.071876Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:32:23.071876Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gE/7Z8LQ+pZT6CeGGXsOI17ltaxRnomUaAQjEgsgClPGfO/oZWCmBfSE/MUVXXFltAjKxqGSrvekXHcVSHEIDw==","signature_status":"signed_v1","signed_at":"2026-07-05T10:32:23.072463Z","signed_message":"canonical_sha256_bytes"},"source_id":"2304.07588","source_kind":"arxiv","source_version":10}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:38c72b4441a2e3df44cb02bb40b877e3b90875d85714a3bbe52122af06d1fcc8","sha256:434cafd1ba332613da83d4db6da483a6fbce9582bdbcd42674bf0023ab5a90d0"],"state_sha256":"ba34d2aa81a883f1c880d52c61e19b7146557b6f6d5a717c4b5780ecf19424d0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3zwfpWn4GQrnTxzFLQu8irN/KV7V8Ya+pc9MTj49djz8B+EgndkEX9AG/R7zcEOPjlA7L+owbVuRj5iM8DBOCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T07:14:17.747939Z","bundle_sha256":"334b4ae7193c5dcb24e4da518e7dd100f6d732718ffc2f21765e48db9ad71631"}}