{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:FKZBLCXC6KRRZ57ON453MBCXSH","short_pith_number":"pith:FKZBLCXC","canonical_record":{"source":{"id":"1510.01458","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-10-06T07:27:45Z","cross_cats_sorted":[],"title_canon_sha256":"fb9a91f2d63749e48e0dbba380b38d8f7b116234ca54deaa61ad499083ff6f61","abstract_canon_sha256":"bf087913aaa86f841d2485ae01be274105ce8f8aca380adcb80b27b6ce57db85"},"schema_version":"1.0"},"canonical_sha256":"2ab2158ae2f2a31cf7ee6f3bb6045791d8655d17673d396e8e5692468c460c5b","source":{"kind":"arxiv","id":"1510.01458","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.01458","created_at":"2026-05-18T01:30:56Z"},{"alias_kind":"arxiv_version","alias_value":"1510.01458v1","created_at":"2026-05-18T01:30:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.01458","created_at":"2026-05-18T01:30:56Z"},{"alias_kind":"pith_short_12","alias_value":"FKZBLCXC6KRR","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"FKZBLCXC6KRRZ57O","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"FKZBLCXC","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:FKZBLCXC6KRRZ57ON453MBCXSH","target":"record","payload":{"canonical_record":{"source":{"id":"1510.01458","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-10-06T07:27:45Z","cross_cats_sorted":[],"title_canon_sha256":"fb9a91f2d63749e48e0dbba380b38d8f7b116234ca54deaa61ad499083ff6f61","abstract_canon_sha256":"bf087913aaa86f841d2485ae01be274105ce8f8aca380adcb80b27b6ce57db85"},"schema_version":"1.0"},"canonical_sha256":"2ab2158ae2f2a31cf7ee6f3bb6045791d8655d17673d396e8e5692468c460c5b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:30:56.869162Z","signature_b64":"DYaOIK1gZ1nQm0H8TiWOE2yDPjyDCaVeOWIKRga2/QBTYLal/TubD+SwpaAnqk8F/pW2Wm9IQx+FazihNELjAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2ab2158ae2f2a31cf7ee6f3bb6045791d8655d17673d396e8e5692468c460c5b","last_reissued_at":"2026-05-18T01:30:56.868708Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:30:56.868708Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.01458","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":"2026-05-18T01:30:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uBV4fxC4PzlEqLDQL4SelQUFaW9pS1uQ90IPbMqdBezpv2QsQyDX5hAB0ykwmAOAgZbmg/fLqTjcJfUYMHRCDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T14:58:04.628555Z"},"content_sha256":"62d86a63c28cc7dde1fee589f2ecd2fd65dc9c1199c2c9e33472a93433d07167","schema_version":"1.0","event_id":"sha256:62d86a63c28cc7dde1fee589f2ecd2fd65dc9c1199c2c9e33472a93433d07167"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:FKZBLCXC6KRRZ57ON453MBCXSH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Adaptive Adjustment of Relaxation Parameters for Algebraic Reconstruction Technique and its Possible Application to Sparsity Prior X-ray CT Reconstruction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Andrew Lambert, Mark Pickering, Murat Tahtali, Sajib Saha","submitted_at":"2015-10-06T07:27:45Z","abstract_excerpt":"In this paper, we systematically evaluate the performance of adaptive adjustment of the relaxation parameters of various iterative algorithms for X-ray CT reconstruction relying on sparsity priors. Sparsity prior has been found to be an efficient strategy in CT reconstruction where significantly fewer attenuation measurements are available. Sparsity prior CT reconstruction relies on iterative algorithms such as the algebraic reconstruction technique (ART) to produce a crude reconstruction based on which a sparse approximation is performed. Data driven adjustment of relaxation has been found to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.01458","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":"2026-05-18T01:30:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R4fljyJMeTuPUK6aK69yFhxG4N0xGIJKEZE+ClHdrr77HVVFUn9TQM6J2pF9rnzbcMSRkL+J+M+4+fKqIph4Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T14:58:04.629257Z"},"content_sha256":"a6c1b877e8ae4730c3797058b2b1748ea865ec5d0b1d7e0d23243f38d0ef35a5","schema_version":"1.0","event_id":"sha256:a6c1b877e8ae4730c3797058b2b1748ea865ec5d0b1d7e0d23243f38d0ef35a5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FKZBLCXC6KRRZ57ON453MBCXSH/bundle.json","state_url":"https://pith.science/pith/FKZBLCXC6KRRZ57ON453MBCXSH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FKZBLCXC6KRRZ57ON453MBCXSH/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":"2026-05-27T14:58:04Z","links":{"resolver":"https://pith.science/pith/FKZBLCXC6KRRZ57ON453MBCXSH","bundle":"https://pith.science/pith/FKZBLCXC6KRRZ57ON453MBCXSH/bundle.json","state":"https://pith.science/pith/FKZBLCXC6KRRZ57ON453MBCXSH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FKZBLCXC6KRRZ57ON453MBCXSH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:FKZBLCXC6KRRZ57ON453MBCXSH","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":"bf087913aaa86f841d2485ae01be274105ce8f8aca380adcb80b27b6ce57db85","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-10-06T07:27:45Z","title_canon_sha256":"fb9a91f2d63749e48e0dbba380b38d8f7b116234ca54deaa61ad499083ff6f61"},"schema_version":"1.0","source":{"id":"1510.01458","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.01458","created_at":"2026-05-18T01:30:56Z"},{"alias_kind":"arxiv_version","alias_value":"1510.01458v1","created_at":"2026-05-18T01:30:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.01458","created_at":"2026-05-18T01:30:56Z"},{"alias_kind":"pith_short_12","alias_value":"FKZBLCXC6KRR","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"FKZBLCXC6KRRZ57O","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"FKZBLCXC","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:a6c1b877e8ae4730c3797058b2b1748ea865ec5d0b1d7e0d23243f38d0ef35a5","target":"graph","created_at":"2026-05-18T01:30:56Z","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":"In this paper, we systematically evaluate the performance of adaptive adjustment of the relaxation parameters of various iterative algorithms for X-ray CT reconstruction relying on sparsity priors. Sparsity prior has been found to be an efficient strategy in CT reconstruction where significantly fewer attenuation measurements are available. Sparsity prior CT reconstruction relies on iterative algorithms such as the algebraic reconstruction technique (ART) to produce a crude reconstruction based on which a sparse approximation is performed. Data driven adjustment of relaxation has been found to","authors_text":"Andrew Lambert, Mark Pickering, Murat Tahtali, Sajib Saha","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-10-06T07:27:45Z","title":"Adaptive Adjustment of Relaxation Parameters for Algebraic Reconstruction Technique and its Possible Application to Sparsity Prior X-ray CT Reconstruction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.01458","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":"sha256:62d86a63c28cc7dde1fee589f2ecd2fd65dc9c1199c2c9e33472a93433d07167","target":"record","created_at":"2026-05-18T01:30:56Z","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":"bf087913aaa86f841d2485ae01be274105ce8f8aca380adcb80b27b6ce57db85","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-10-06T07:27:45Z","title_canon_sha256":"fb9a91f2d63749e48e0dbba380b38d8f7b116234ca54deaa61ad499083ff6f61"},"schema_version":"1.0","source":{"id":"1510.01458","kind":"arxiv","version":1}},"canonical_sha256":"2ab2158ae2f2a31cf7ee6f3bb6045791d8655d17673d396e8e5692468c460c5b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2ab2158ae2f2a31cf7ee6f3bb6045791d8655d17673d396e8e5692468c460c5b","first_computed_at":"2026-05-18T01:30:56.868708Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:30:56.868708Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DYaOIK1gZ1nQm0H8TiWOE2yDPjyDCaVeOWIKRga2/QBTYLal/TubD+SwpaAnqk8F/pW2Wm9IQx+FazihNELjAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:30:56.869162Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.01458","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:62d86a63c28cc7dde1fee589f2ecd2fd65dc9c1199c2c9e33472a93433d07167","sha256:a6c1b877e8ae4730c3797058b2b1748ea865ec5d0b1d7e0d23243f38d0ef35a5"],"state_sha256":"ca2190b74e8f0f30c08d724b27898d31aecb508ebbaedd4f65797f36adc1e5c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QLG6swHXoP9GbbNb8aPqCCHAiXazXGPKpZlgAk8sakl1v6tsJ995xfiVXxA98nuGGK6ASPv7GxMpBa0VrkDmCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T14:58:04.632556Z","bundle_sha256":"3298017d349dcb33c1dc50a126b075de416e490aa6807cbe61ce577fa4a3669f"}}