{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:UBZ3W3B5MRX7VBICLUJAKJY4Q2","short_pith_number":"pith:UBZ3W3B5","canonical_record":{"source":{"id":"1809.08308","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-09-21T21:01:13Z","cross_cats_sorted":[],"title_canon_sha256":"f7e4ceea81330260d005464c710cc65b44799c95bbcb401aee9ca117e11932d6","abstract_canon_sha256":"d5ead8a508ffd9f3fc2f678ae8c7ea6f295016e80b378efd754806dbd81e72af"},"schema_version":"1.0"},"canonical_sha256":"a073bb6c3d646ffa85025d1205271c86a29e0ec4a583988e6510042501583235","source":{"kind":"arxiv","id":"1809.08308","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.08308","created_at":"2026-05-18T00:05:08Z"},{"alias_kind":"arxiv_version","alias_value":"1809.08308v1","created_at":"2026-05-18T00:05:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.08308","created_at":"2026-05-18T00:05:08Z"},{"alias_kind":"pith_short_12","alias_value":"UBZ3W3B5MRX7","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"UBZ3W3B5MRX7VBIC","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"UBZ3W3B5","created_at":"2026-05-18T12:32:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:UBZ3W3B5MRX7VBICLUJAKJY4Q2","target":"record","payload":{"canonical_record":{"source":{"id":"1809.08308","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-09-21T21:01:13Z","cross_cats_sorted":[],"title_canon_sha256":"f7e4ceea81330260d005464c710cc65b44799c95bbcb401aee9ca117e11932d6","abstract_canon_sha256":"d5ead8a508ffd9f3fc2f678ae8c7ea6f295016e80b378efd754806dbd81e72af"},"schema_version":"1.0"},"canonical_sha256":"a073bb6c3d646ffa85025d1205271c86a29e0ec4a583988e6510042501583235","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:05:08.870182Z","signature_b64":"BeCQA1yO3KwREbI4aiKTYJZlTvdITmPyXh5TYuVoZnhDxXHiZ1IwqWsg9Lx3HnR6YqkhGmPghu8PNExfJIUDBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a073bb6c3d646ffa85025d1205271c86a29e0ec4a583988e6510042501583235","last_reissued_at":"2026-05-18T00:05:08.869500Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:05:08.869500Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.08308","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":"2026-05-18T00:05:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5C88Fr5Se5xAxzegYYgSUe/EXA1JqJAVirNnPdrF/hCmfWTGtP6vlWH9fKNgv4CM2i8KUih9AcrEMzAZDSqeCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T07:10:29.552630Z"},"content_sha256":"a7e50f7250e0a0d2528afe7863f30163f5b5bb965df7928906d9899305c8efc8","schema_version":"1.0","event_id":"sha256:a7e50f7250e0a0d2528afe7863f30163f5b5bb965df7928906d9899305c8efc8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:UBZ3W3B5MRX7VBICLUJAKJY4Q2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comparison of Sinogram-based Iterative Reconstruction with Compressed Sensing Techniques in X-ray CT","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Dragos Trinca, Eduard Libin","submitted_at":"2018-09-21T21:01:13Z","abstract_excerpt":"Performing X-ray computed tomography (CT) examinations with less radiation has recently received increasing interest: in medical imaging this means less (potentially harmful) radiation for the patient; in non-destructive testing of materials/objects such as testing jet engines, the redution of the number of projection angles (which for large objects is in general high) leads to a substantial decreasing of the experiment time. In the experiment, less radiation is usually achieved by either (1) reducing the radiation dose used at each projection angle or (2) using sparse view X-ray CT, which mea"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.08308","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":"2026-05-18T00:05:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6/LtVpKeRePf69CbCfIi22QFn3pLh4JJczNfB11V4SyoESXuyLxfksMkOjy8rAhwVoWOvwLsTiUwDdWwmzIcAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T07:10:29.553138Z"},"content_sha256":"6026e74421e143570c4c91ad2e34edaae2967f45b720ea690bc434614407ab32","schema_version":"1.0","event_id":"sha256:6026e74421e143570c4c91ad2e34edaae2967f45b720ea690bc434614407ab32"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UBZ3W3B5MRX7VBICLUJAKJY4Q2/bundle.json","state_url":"https://pith.science/pith/UBZ3W3B5MRX7VBICLUJAKJY4Q2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UBZ3W3B5MRX7VBICLUJAKJY4Q2/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":"2026-05-27T07:10:29Z","links":{"resolver":"https://pith.science/pith/UBZ3W3B5MRX7VBICLUJAKJY4Q2","bundle":"https://pith.science/pith/UBZ3W3B5MRX7VBICLUJAKJY4Q2/bundle.json","state":"https://pith.science/pith/UBZ3W3B5MRX7VBICLUJAKJY4Q2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UBZ3W3B5MRX7VBICLUJAKJY4Q2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:UBZ3W3B5MRX7VBICLUJAKJY4Q2","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":"d5ead8a508ffd9f3fc2f678ae8c7ea6f295016e80b378efd754806dbd81e72af","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-09-21T21:01:13Z","title_canon_sha256":"f7e4ceea81330260d005464c710cc65b44799c95bbcb401aee9ca117e11932d6"},"schema_version":"1.0","source":{"id":"1809.08308","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.08308","created_at":"2026-05-18T00:05:08Z"},{"alias_kind":"arxiv_version","alias_value":"1809.08308v1","created_at":"2026-05-18T00:05:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.08308","created_at":"2026-05-18T00:05:08Z"},{"alias_kind":"pith_short_12","alias_value":"UBZ3W3B5MRX7","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"UBZ3W3B5MRX7VBIC","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"UBZ3W3B5","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:6026e74421e143570c4c91ad2e34edaae2967f45b720ea690bc434614407ab32","target":"graph","created_at":"2026-05-18T00:05:08Z","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":"Performing X-ray computed tomography (CT) examinations with less radiation has recently received increasing interest: in medical imaging this means less (potentially harmful) radiation for the patient; in non-destructive testing of materials/objects such as testing jet engines, the redution of the number of projection angles (which for large objects is in general high) leads to a substantial decreasing of the experiment time. In the experiment, less radiation is usually achieved by either (1) reducing the radiation dose used at each projection angle or (2) using sparse view X-ray CT, which mea","authors_text":"Dragos Trinca, Eduard Libin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-09-21T21:01:13Z","title":"Comparison of Sinogram-based Iterative Reconstruction with Compressed Sensing Techniques in X-ray CT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.08308","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:a7e50f7250e0a0d2528afe7863f30163f5b5bb965df7928906d9899305c8efc8","target":"record","created_at":"2026-05-18T00:05:08Z","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":"d5ead8a508ffd9f3fc2f678ae8c7ea6f295016e80b378efd754806dbd81e72af","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-09-21T21:01:13Z","title_canon_sha256":"f7e4ceea81330260d005464c710cc65b44799c95bbcb401aee9ca117e11932d6"},"schema_version":"1.0","source":{"id":"1809.08308","kind":"arxiv","version":1}},"canonical_sha256":"a073bb6c3d646ffa85025d1205271c86a29e0ec4a583988e6510042501583235","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a073bb6c3d646ffa85025d1205271c86a29e0ec4a583988e6510042501583235","first_computed_at":"2026-05-18T00:05:08.869500Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:05:08.869500Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BeCQA1yO3KwREbI4aiKTYJZlTvdITmPyXh5TYuVoZnhDxXHiZ1IwqWsg9Lx3HnR6YqkhGmPghu8PNExfJIUDBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:05:08.870182Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.08308","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a7e50f7250e0a0d2528afe7863f30163f5b5bb965df7928906d9899305c8efc8","sha256:6026e74421e143570c4c91ad2e34edaae2967f45b720ea690bc434614407ab32"],"state_sha256":"44a6790fa082c288e3bed1c1fb61b7adfbaffe1d5b3765eacf8af103eead74f9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vjalDl8I5aL6DjnGPL0qURgyYPIQVOjvfdLPpG/NNnY23qB8oqCcGe13N2wDf2mUdNDejh7IVflOVq6OXVERCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T07:10:29.556855Z","bundle_sha256":"eb459307581e06ebfc6d35c3457f5547f98eb0c9503a31b0957db118af093d00"}}