{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:FQDAS74OWI2UFYFD42VJ3B4DUZ","short_pith_number":"pith:FQDAS74O","canonical_record":{"source":{"id":"1903.09745","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-03-23T02:17:10Z","cross_cats_sorted":[],"title_canon_sha256":"bfbf87eb324c7be277d987c58f5337df7030015e19db005f881a3102c6e39681","abstract_canon_sha256":"f8785fa1dacdfccc7246007308e7b2b5729acb4854e86fd85e202cdd216241ba"},"schema_version":"1.0"},"canonical_sha256":"2c06097f8eb23542e0a3e6aa9d8783a678f42329f119e6bd61d96383d3afcb61","source":{"kind":"arxiv","id":"1903.09745","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.09745","created_at":"2026-05-17T23:50:35Z"},{"alias_kind":"arxiv_version","alias_value":"1903.09745v1","created_at":"2026-05-17T23:50:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.09745","created_at":"2026-05-17T23:50:35Z"},{"alias_kind":"pith_short_12","alias_value":"FQDAS74OWI2U","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"FQDAS74OWI2UFYFD","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"FQDAS74O","created_at":"2026-05-18T12:33:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:FQDAS74OWI2UFYFD42VJ3B4DUZ","target":"record","payload":{"canonical_record":{"source":{"id":"1903.09745","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-03-23T02:17:10Z","cross_cats_sorted":[],"title_canon_sha256":"bfbf87eb324c7be277d987c58f5337df7030015e19db005f881a3102c6e39681","abstract_canon_sha256":"f8785fa1dacdfccc7246007308e7b2b5729acb4854e86fd85e202cdd216241ba"},"schema_version":"1.0"},"canonical_sha256":"2c06097f8eb23542e0a3e6aa9d8783a678f42329f119e6bd61d96383d3afcb61","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:35.629661Z","signature_b64":"Xa1tHiwzCDABo4OObOTMFtQ2JXBl5mHR6j318m9ADO4KvN/MPMwKwJ/p6JdHQpSD5ZKP97RTaTl50+wJj0uyCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c06097f8eb23542e0a3e6aa9d8783a678f42329f119e6bd61d96383d3afcb61","last_reissued_at":"2026-05-17T23:50:35.628939Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:35.628939Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.09745","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":"2026-05-17T23:50:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e98QD92GBiBwxRBJPr5ynwWVMaIO4OLm6GrPs49XmX2zcACRhiN7uAWcEvWhhg9uRMD7TCOk2OzLuD5WpxkZBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T02:17:33.855565Z"},"content_sha256":"2a825399f33888f197b0e558ebfa2535755f3d8b3539ac0dba89598471b0154c","schema_version":"1.0","event_id":"sha256:2a825399f33888f197b0e558ebfa2535755f3d8b3539ac0dba89598471b0154c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:FQDAS74OWI2UFYFD42VJ3B4DUZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fast LLMMSE filter for low-dose CT imaging","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Bowen Lin, Fengling Wang, Shiling Xie, Shujun Fu, Yuliang Li, Zhigang Zhao","submitted_at":"2019-03-23T02:17:10Z","abstract_excerpt":"Low-dose X-ray CT technology is one of important directions of current research and development of medical imaging equipment. A fast algorithm of blockwise sinogram filtering is presented for realtime low-dose CT imaging. A nonstationary Gaussian noise model of low-dose sinogram data is proposed in the low-mA (tube current) CT protocol. Then, according to the linear minimum mean square error principle, an adaptive blockwise algorithm is built to filter contaminated sinogram data caused by photon starvation. A moving sum technique is used to speed the algorithm into a linear time one, regardles"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.09745","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":"2026-05-17T23:50:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9Tpbkr4U546AQV2SQxkmTposVblGnGg2f8pSlDhk75hOd6zwvYHLtqfkoxVG1u31Cg0hgWbUbUFVhAhHsIpcDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T02:17:33.855914Z"},"content_sha256":"9106d820e3f5d14bef3440908bbf06e3ff06100f0e2ecc9cb383c5b46a4a6582","schema_version":"1.0","event_id":"sha256:9106d820e3f5d14bef3440908bbf06e3ff06100f0e2ecc9cb383c5b46a4a6582"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FQDAS74OWI2UFYFD42VJ3B4DUZ/bundle.json","state_url":"https://pith.science/pith/FQDAS74OWI2UFYFD42VJ3B4DUZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FQDAS74OWI2UFYFD42VJ3B4DUZ/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":"2026-05-28T02:17:33Z","links":{"resolver":"https://pith.science/pith/FQDAS74OWI2UFYFD42VJ3B4DUZ","bundle":"https://pith.science/pith/FQDAS74OWI2UFYFD42VJ3B4DUZ/bundle.json","state":"https://pith.science/pith/FQDAS74OWI2UFYFD42VJ3B4DUZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FQDAS74OWI2UFYFD42VJ3B4DUZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:FQDAS74OWI2UFYFD42VJ3B4DUZ","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":"f8785fa1dacdfccc7246007308e7b2b5729acb4854e86fd85e202cdd216241ba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-03-23T02:17:10Z","title_canon_sha256":"bfbf87eb324c7be277d987c58f5337df7030015e19db005f881a3102c6e39681"},"schema_version":"1.0","source":{"id":"1903.09745","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.09745","created_at":"2026-05-17T23:50:35Z"},{"alias_kind":"arxiv_version","alias_value":"1903.09745v1","created_at":"2026-05-17T23:50:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.09745","created_at":"2026-05-17T23:50:35Z"},{"alias_kind":"pith_short_12","alias_value":"FQDAS74OWI2U","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"FQDAS74OWI2UFYFD","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"FQDAS74O","created_at":"2026-05-18T12:33:15Z"}],"graph_snapshots":[{"event_id":"sha256:9106d820e3f5d14bef3440908bbf06e3ff06100f0e2ecc9cb383c5b46a4a6582","target":"graph","created_at":"2026-05-17T23:50:35Z","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":"Low-dose X-ray CT technology is one of important directions of current research and development of medical imaging equipment. A fast algorithm of blockwise sinogram filtering is presented for realtime low-dose CT imaging. A nonstationary Gaussian noise model of low-dose sinogram data is proposed in the low-mA (tube current) CT protocol. Then, according to the linear minimum mean square error principle, an adaptive blockwise algorithm is built to filter contaminated sinogram data caused by photon starvation. A moving sum technique is used to speed the algorithm into a linear time one, regardles","authors_text":"Bowen Lin, Fengling Wang, Shiling Xie, Shujun Fu, Yuliang Li, Zhigang Zhao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-03-23T02:17:10Z","title":"Fast LLMMSE filter for low-dose CT imaging"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.09745","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":"sha256:2a825399f33888f197b0e558ebfa2535755f3d8b3539ac0dba89598471b0154c","target":"record","created_at":"2026-05-17T23:50:35Z","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":"f8785fa1dacdfccc7246007308e7b2b5729acb4854e86fd85e202cdd216241ba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-03-23T02:17:10Z","title_canon_sha256":"bfbf87eb324c7be277d987c58f5337df7030015e19db005f881a3102c6e39681"},"schema_version":"1.0","source":{"id":"1903.09745","kind":"arxiv","version":1}},"canonical_sha256":"2c06097f8eb23542e0a3e6aa9d8783a678f42329f119e6bd61d96383d3afcb61","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2c06097f8eb23542e0a3e6aa9d8783a678f42329f119e6bd61d96383d3afcb61","first_computed_at":"2026-05-17T23:50:35.628939Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:35.628939Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Xa1tHiwzCDABo4OObOTMFtQ2JXBl5mHR6j318m9ADO4KvN/MPMwKwJ/p6JdHQpSD5ZKP97RTaTl50+wJj0uyCw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:35.629661Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.09745","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2a825399f33888f197b0e558ebfa2535755f3d8b3539ac0dba89598471b0154c","sha256:9106d820e3f5d14bef3440908bbf06e3ff06100f0e2ecc9cb383c5b46a4a6582"],"state_sha256":"a2589eae038aea2c79f416380959177aee2da12aa1fed5db0d4fdbf7f84dbac3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9tweunpVT3Qmv3uXpuBMVAEydMZ43wGd59IrNyhUwyPKmrwwS3j5cPhoZlAg/c3/zWx5FL4A9Nj7KksAImBGCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T02:17:33.857878Z","bundle_sha256":"c53a6b0fa85ab81fb3b599fcc2c226e6c5e1c3f01022313f12bc38df9f135854"}}