{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:55ZRKRBOLELBEH272KSG7PPW3R","short_pith_number":"pith:55ZRKRBO","canonical_record":{"source":{"id":"1907.01891","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-06-27T10:37:37Z","cross_cats_sorted":["cs.DC"],"title_canon_sha256":"7e95448b7002a6bbf2a676813a0cc9d499f8f1d9e92061c181d5f867c0964b3f","abstract_canon_sha256":"875bed093b8f874cbec63c8cb5c1dcea5737d2e26808a114b839feb08798d7cf"},"schema_version":"1.0"},"canonical_sha256":"ef7315442e5916121f5fd2a46fbdf6dc40d7eccdd8d0a093a6292af23157be8b","source":{"kind":"arxiv","id":"1907.01891","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.01891","created_at":"2026-05-17T23:41:34Z"},{"alias_kind":"arxiv_version","alias_value":"1907.01891v1","created_at":"2026-05-17T23:41:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.01891","created_at":"2026-05-17T23:41:34Z"},{"alias_kind":"pith_short_12","alias_value":"55ZRKRBOLELB","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_16","alias_value":"55ZRKRBOLELBEH27","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_8","alias_value":"55ZRKRBO","created_at":"2026-05-18T12:33:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:55ZRKRBOLELBEH272KSG7PPW3R","target":"record","payload":{"canonical_record":{"source":{"id":"1907.01891","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-06-27T10:37:37Z","cross_cats_sorted":["cs.DC"],"title_canon_sha256":"7e95448b7002a6bbf2a676813a0cc9d499f8f1d9e92061c181d5f867c0964b3f","abstract_canon_sha256":"875bed093b8f874cbec63c8cb5c1dcea5737d2e26808a114b839feb08798d7cf"},"schema_version":"1.0"},"canonical_sha256":"ef7315442e5916121f5fd2a46fbdf6dc40d7eccdd8d0a093a6292af23157be8b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:34.628140Z","signature_b64":"jX4vg2YzmbiSN9293d0Ap3uTMUtfYUq32vhdaX5XnbyZ4BIWbWUbl+E2XW4I/2lx0eD5us34dxQyZWn7KEZtAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef7315442e5916121f5fd2a46fbdf6dc40d7eccdd8d0a093a6292af23157be8b","last_reissued_at":"2026-05-17T23:41:34.627553Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:34.627553Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.01891","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":"2026-05-17T23:41:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d2oDpN/GSbO4BE3LYFgp+y1fZr2ayZsKFio9slweVS6C/ahKWWe7EDorZ9QF4q0XSvSI+Zc2RED8yl8wY1QACw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T13:44:13.407556Z"},"content_sha256":"3b1047e34548fec74182c779eba113dbc462f8702f26f4819e6ce64e3cc9b957","schema_version":"1.0","event_id":"sha256:3b1047e34548fec74182c779eba113dbc462f8702f26f4819e6ce64e3cc9b957"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:55ZRKRBOLELBEH272KSG7PPW3R","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Computed tomography medical image reconstruction on affordable equipment by using out-of-core techniques","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.DC"],"primary_cat":"eess.IV","authors_text":"Gregorio Quintana-Ort\\'i, Gumersindo Verd\\'u, M\\'onica Chillar\\'on, Vicente Vidal","submitted_at":"2019-06-27T10:37:37Z","abstract_excerpt":"As Computed Tomography (CT) scans are an essential medical test, many techniques have been proposed to reconstruct high-quality images using a smaller amount of radiation. One approach is to employ algebraic factorization methods to reconstruct the images, using fewer views than the traditional analytical methods. However, their main drawback is the high computational cost and hence the time needed to obtain the images, which is critical in the daily clinical practice. For this reason, faster methods for solving this problem are required. In this paper, we propose a new reconstruction method b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.01891","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":"2026-05-17T23:41:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E4i1QdzdzKvE6flIiVgLhigyNAbvPKS6anV5Dkn8otTErzJZlZMByCclr4qZtNaWu77WF6LhF2IRn9s6YjFaDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T13:44:13.407896Z"},"content_sha256":"2dd36ef676f16b71a8691909a1d2debdb7c37fb6b893332f9b60b896d832785c","schema_version":"1.0","event_id":"sha256:2dd36ef676f16b71a8691909a1d2debdb7c37fb6b893332f9b60b896d832785c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/55ZRKRBOLELBEH272KSG7PPW3R/bundle.json","state_url":"https://pith.science/pith/55ZRKRBOLELBEH272KSG7PPW3R/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/55ZRKRBOLELBEH272KSG7PPW3R/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":"2026-06-28T13:44:13Z","links":{"resolver":"https://pith.science/pith/55ZRKRBOLELBEH272KSG7PPW3R","bundle":"https://pith.science/pith/55ZRKRBOLELBEH272KSG7PPW3R/bundle.json","state":"https://pith.science/pith/55ZRKRBOLELBEH272KSG7PPW3R/state.json","well_known_bundle":"https://pith.science/.well-known/pith/55ZRKRBOLELBEH272KSG7PPW3R/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:55ZRKRBOLELBEH272KSG7PPW3R","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":"875bed093b8f874cbec63c8cb5c1dcea5737d2e26808a114b839feb08798d7cf","cross_cats_sorted":["cs.DC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-06-27T10:37:37Z","title_canon_sha256":"7e95448b7002a6bbf2a676813a0cc9d499f8f1d9e92061c181d5f867c0964b3f"},"schema_version":"1.0","source":{"id":"1907.01891","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.01891","created_at":"2026-05-17T23:41:34Z"},{"alias_kind":"arxiv_version","alias_value":"1907.01891v1","created_at":"2026-05-17T23:41:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.01891","created_at":"2026-05-17T23:41:34Z"},{"alias_kind":"pith_short_12","alias_value":"55ZRKRBOLELB","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_16","alias_value":"55ZRKRBOLELBEH27","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_8","alias_value":"55ZRKRBO","created_at":"2026-05-18T12:33:10Z"}],"graph_snapshots":[{"event_id":"sha256:2dd36ef676f16b71a8691909a1d2debdb7c37fb6b893332f9b60b896d832785c","target":"graph","created_at":"2026-05-17T23:41:34Z","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":"As Computed Tomography (CT) scans are an essential medical test, many techniques have been proposed to reconstruct high-quality images using a smaller amount of radiation. One approach is to employ algebraic factorization methods to reconstruct the images, using fewer views than the traditional analytical methods. However, their main drawback is the high computational cost and hence the time needed to obtain the images, which is critical in the daily clinical practice. For this reason, faster methods for solving this problem are required. In this paper, we propose a new reconstruction method b","authors_text":"Gregorio Quintana-Ort\\'i, Gumersindo Verd\\'u, M\\'onica Chillar\\'on, Vicente Vidal","cross_cats":["cs.DC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-06-27T10:37:37Z","title":"Computed tomography medical image reconstruction on affordable equipment by using out-of-core techniques"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.01891","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":"sha256:3b1047e34548fec74182c779eba113dbc462f8702f26f4819e6ce64e3cc9b957","target":"record","created_at":"2026-05-17T23:41:34Z","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":"875bed093b8f874cbec63c8cb5c1dcea5737d2e26808a114b839feb08798d7cf","cross_cats_sorted":["cs.DC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2019-06-27T10:37:37Z","title_canon_sha256":"7e95448b7002a6bbf2a676813a0cc9d499f8f1d9e92061c181d5f867c0964b3f"},"schema_version":"1.0","source":{"id":"1907.01891","kind":"arxiv","version":1}},"canonical_sha256":"ef7315442e5916121f5fd2a46fbdf6dc40d7eccdd8d0a093a6292af23157be8b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef7315442e5916121f5fd2a46fbdf6dc40d7eccdd8d0a093a6292af23157be8b","first_computed_at":"2026-05-17T23:41:34.627553Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:41:34.627553Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jX4vg2YzmbiSN9293d0Ap3uTMUtfYUq32vhdaX5XnbyZ4BIWbWUbl+E2XW4I/2lx0eD5us34dxQyZWn7KEZtAQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:41:34.628140Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.01891","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3b1047e34548fec74182c779eba113dbc462f8702f26f4819e6ce64e3cc9b957","sha256:2dd36ef676f16b71a8691909a1d2debdb7c37fb6b893332f9b60b896d832785c"],"state_sha256":"5fe33a21e8a6ccc20400dbe01ef6c806482a109dcee31bcfa0e75541ff80b7a0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0MVktpxHU6OG6veUXPHHtx5D1vP3hjeBTbNrslPLINuMIhbFjj51Va6uhuRv9Yeh696EnYFbQ65ZgD2+/KJECw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T13:44:13.409766Z","bundle_sha256":"660e88c0c6de5593115c0ca559e3caf22aef09cc6b364fb7520ed10dbf8b2e41"}}