{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:X4RVO43NYLR2URBHQ7433EDFDP","short_pith_number":"pith:X4RVO43N","schema_version":"1.0","canonical_sha256":"bf2357736dc2e3aa442787f9bd90651bf1596a9d97fc3ec544a838cab71f7479","source":{"kind":"arxiv","id":"0904.1016","version":1},"attestation_state":"computed","paper":{"title":"Enhanced imaging of microcalcifications in digital breast tomosynthesis through improved image-reconstruction algorithms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Daniel B. Kopans, Emil Y. Sidky, Ingrid S. Reiser, Richard H. Moore, Robert M. Nishikawa, Xiaochuan Pan","submitted_at":"2009-04-07T15:27:08Z","abstract_excerpt":"PURPOSE: We develop a practical, iterative algorithm for image-reconstruction in under-sampled tomographic systems, such as digital breast tomosynthesis (DBT).\n  METHOD: The algorithm controls image regularity by minimizing the image total $p$-variation (TpV), a function that reduces to the total variation when $p=1.0$ or the image roughness when $p=2.0$. Constraints on the image, such as image positivity and estimated projection-data tolerance, are enforced by projection onto convex sets (POCS). The fact that the tomographic system is under-sampled translates to the mathematical property that"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"0904.1016","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2009-04-07T15:27:08Z","cross_cats_sorted":[],"title_canon_sha256":"c0370d8613922b9ac4972d6899b79a19232aeeb164cef58dc4c7e2ebc6d50362","abstract_canon_sha256":"4107527e4127f7735fa362549a692f769a951746df3201c546f7a69c8e771932"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:07.146403Z","signature_b64":"yuLa+ThrZ5unBdqwzAxKhurxoicqKbdYPuhT3/RFyujwtBkN46fxtMG2kDM1pnRSGNgX3/V1vvuw0AmBXldkAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bf2357736dc2e3aa442787f9bd90651bf1596a9d97fc3ec544a838cab71f7479","last_reissued_at":"2026-05-18T02:14:07.145772Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:07.145772Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Enhanced imaging of microcalcifications in digital breast tomosynthesis through improved image-reconstruction algorithms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Daniel B. Kopans, Emil Y. Sidky, Ingrid S. Reiser, Richard H. Moore, Robert M. Nishikawa, Xiaochuan Pan","submitted_at":"2009-04-07T15:27:08Z","abstract_excerpt":"PURPOSE: We develop a practical, iterative algorithm for image-reconstruction in under-sampled tomographic systems, such as digital breast tomosynthesis (DBT).\n  METHOD: The algorithm controls image regularity by minimizing the image total $p$-variation (TpV), a function that reduces to the total variation when $p=1.0$ or the image roughness when $p=2.0$. Constraints on the image, such as image positivity and estimated projection-data tolerance, are enforced by projection onto convex sets (POCS). The fact that the tomographic system is under-sampled translates to the mathematical property that"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.1016","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"0904.1016","created_at":"2026-05-18T02:14:07.145861+00:00"},{"alias_kind":"arxiv_version","alias_value":"0904.1016v1","created_at":"2026-05-18T02:14:07.145861+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.1016","created_at":"2026-05-18T02:14:07.145861+00:00"},{"alias_kind":"pith_short_12","alias_value":"X4RVO43NYLR2","created_at":"2026-05-18T12:26:02.257875+00:00"},{"alias_kind":"pith_short_16","alias_value":"X4RVO43NYLR2URBH","created_at":"2026-05-18T12:26:02.257875+00:00"},{"alias_kind":"pith_short_8","alias_value":"X4RVO43N","created_at":"2026-05-18T12:26:02.257875+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP","json":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP.json","graph_json":"https://pith.science/api/pith-number/X4RVO43NYLR2URBHQ7433EDFDP/graph.json","events_json":"https://pith.science/api/pith-number/X4RVO43NYLR2URBHQ7433EDFDP/events.json","paper":"https://pith.science/paper/X4RVO43N"},"agent_actions":{"view_html":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP","download_json":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP.json","view_paper":"https://pith.science/paper/X4RVO43N","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0904.1016&json=true","fetch_graph":"https://pith.science/api/pith-number/X4RVO43NYLR2URBHQ7433EDFDP/graph.json","fetch_events":"https://pith.science/api/pith-number/X4RVO43NYLR2URBHQ7433EDFDP/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP/action/timestamp_anchor","attest_storage":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP/action/storage_attestation","attest_author":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP/action/author_attestation","sign_citation":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP/action/citation_signature","submit_replication":"https://pith.science/pith/X4RVO43NYLR2URBHQ7433EDFDP/action/replication_record"}},"created_at":"2026-05-18T02:14:07.145861+00:00","updated_at":"2026-05-18T02:14:07.145861+00:00"}