{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:K63XRCUQQMPO6C4JPAHACXDONK","short_pith_number":"pith:K63XRCUQ","canonical_record":{"source":{"id":"1812.00693","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-12-03T12:07:01Z","cross_cats_sorted":["cs.CV","physics.med-ph"],"title_canon_sha256":"bb5ed21afdda86a6bf2f15007a370541c994ec32aedc8204838661b2dcac9f64","abstract_canon_sha256":"9a7f25d3fff1d66666218268683b0bfe378ffe7491cd46e6ef2a422055a1dcbe"},"schema_version":"1.0"},"canonical_sha256":"57b7788a90831eef0b89780e015c6e6aa9514435ab797ce12338aa58d31f7041","source":{"kind":"arxiv","id":"1812.00693","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.00693","created_at":"2026-05-17T23:53:57Z"},{"alias_kind":"arxiv_version","alias_value":"1812.00693v1","created_at":"2026-05-17T23:53:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.00693","created_at":"2026-05-17T23:53:57Z"},{"alias_kind":"pith_short_12","alias_value":"K63XRCUQQMPO","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"K63XRCUQQMPO6C4J","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"K63XRCUQ","created_at":"2026-05-18T12:32:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:K63XRCUQQMPO6C4JPAHACXDONK","target":"record","payload":{"canonical_record":{"source":{"id":"1812.00693","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-12-03T12:07:01Z","cross_cats_sorted":["cs.CV","physics.med-ph"],"title_canon_sha256":"bb5ed21afdda86a6bf2f15007a370541c994ec32aedc8204838661b2dcac9f64","abstract_canon_sha256":"9a7f25d3fff1d66666218268683b0bfe378ffe7491cd46e6ef2a422055a1dcbe"},"schema_version":"1.0"},"canonical_sha256":"57b7788a90831eef0b89780e015c6e6aa9514435ab797ce12338aa58d31f7041","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:53:57.257930Z","signature_b64":"o0AWQk0e7qXYzCLivqXBnYfRvctIAUZGuXsArpoC1v9iLlz8pJH3k4CUAGmiz5fgbz0i7eHK378p1t7GHsrSBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"57b7788a90831eef0b89780e015c6e6aa9514435ab797ce12338aa58d31f7041","last_reissued_at":"2026-05-17T23:53:57.257400Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:53:57.257400Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1812.00693","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":"2026-05-17T23:53:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gbYfg27e18kH10KJdLcWEVZISWMMZwEY+UM3AvmVnL7QvLz41zMh5pwnb1tRW2perPUMayHC61pyzsms6hOyDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:46:02.555674Z"},"content_sha256":"f3e32b99f03a9ee07dec768a1c0d7498e9636415e49524ab793212cd594470bc","schema_version":"1.0","event_id":"sha256:f3e32b99f03a9ee07dec768a1c0d7498e9636415e49524ab793212cd594470bc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:K63XRCUQQMPO6C4JPAHACXDONK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Analysis by Synthesis Approach for Automatic Vertebral Shape Identification in Clinical QCT","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CV","physics.med-ph"],"primary_cat":"eess.IV","authors_text":"Claus-C. Gl\\\"uer, Lukas Huber, Reimer Andresen, Reinhard Barkmann, Reinhard Koch, Stefan Reinhold. Timo Damm","submitted_at":"2018-12-03T12:07:01Z","abstract_excerpt":"Quantitative computed tomography (QCT) is a widely used tool for osteoporosis diagnosis and monitoring. The assessment of cortical markers like cortical bone mineral density (BMD) and thickness is a demanding task, mainly because of the limited spatial resolution of QCT. We propose a direct model based method to automatically identify the surface through the center of the cortex of human vertebra. We develop a statistical bone model and analyze its probability distribution after the imaging process. Using an as-rigid-as-possible deformation we find the cortical surface that maximizes the likel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.00693","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":"2026-05-17T23:53:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TIGpZX/h8p7t84/LFmdRt6hHDdD8nZDYu7CXncTunYpBK3xKt+iC+mN1FiR4TDsszQq+GUXK9EYX8qp7Nj/2Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:46:02.556029Z"},"content_sha256":"bc0fc3e23a1a9d3aa6e8ba6f678083e06697c6722c9ebf5cdae3638bdb708e91","schema_version":"1.0","event_id":"sha256:bc0fc3e23a1a9d3aa6e8ba6f678083e06697c6722c9ebf5cdae3638bdb708e91"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/K63XRCUQQMPO6C4JPAHACXDONK/bundle.json","state_url":"https://pith.science/pith/K63XRCUQQMPO6C4JPAHACXDONK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/K63XRCUQQMPO6C4JPAHACXDONK/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":"2026-05-30T08:46:02Z","links":{"resolver":"https://pith.science/pith/K63XRCUQQMPO6C4JPAHACXDONK","bundle":"https://pith.science/pith/K63XRCUQQMPO6C4JPAHACXDONK/bundle.json","state":"https://pith.science/pith/K63XRCUQQMPO6C4JPAHACXDONK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/K63XRCUQQMPO6C4JPAHACXDONK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:K63XRCUQQMPO6C4JPAHACXDONK","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":"9a7f25d3fff1d66666218268683b0bfe378ffe7491cd46e6ef2a422055a1dcbe","cross_cats_sorted":["cs.CV","physics.med-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-12-03T12:07:01Z","title_canon_sha256":"bb5ed21afdda86a6bf2f15007a370541c994ec32aedc8204838661b2dcac9f64"},"schema_version":"1.0","source":{"id":"1812.00693","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.00693","created_at":"2026-05-17T23:53:57Z"},{"alias_kind":"arxiv_version","alias_value":"1812.00693v1","created_at":"2026-05-17T23:53:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.00693","created_at":"2026-05-17T23:53:57Z"},{"alias_kind":"pith_short_12","alias_value":"K63XRCUQQMPO","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"K63XRCUQQMPO6C4J","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"K63XRCUQ","created_at":"2026-05-18T12:32:33Z"}],"graph_snapshots":[{"event_id":"sha256:bc0fc3e23a1a9d3aa6e8ba6f678083e06697c6722c9ebf5cdae3638bdb708e91","target":"graph","created_at":"2026-05-17T23:53:57Z","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":"Quantitative computed tomography (QCT) is a widely used tool for osteoporosis diagnosis and monitoring. The assessment of cortical markers like cortical bone mineral density (BMD) and thickness is a demanding task, mainly because of the limited spatial resolution of QCT. We propose a direct model based method to automatically identify the surface through the center of the cortex of human vertebra. We develop a statistical bone model and analyze its probability distribution after the imaging process. Using an as-rigid-as-possible deformation we find the cortical surface that maximizes the likel","authors_text":"Claus-C. Gl\\\"uer, Lukas Huber, Reimer Andresen, Reinhard Barkmann, Reinhard Koch, Stefan Reinhold. Timo Damm","cross_cats":["cs.CV","physics.med-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-12-03T12:07:01Z","title":"An Analysis by Synthesis Approach for Automatic Vertebral Shape Identification in Clinical QCT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.00693","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:f3e32b99f03a9ee07dec768a1c0d7498e9636415e49524ab793212cd594470bc","target":"record","created_at":"2026-05-17T23:53:57Z","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":"9a7f25d3fff1d66666218268683b0bfe378ffe7491cd46e6ef2a422055a1dcbe","cross_cats_sorted":["cs.CV","physics.med-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-12-03T12:07:01Z","title_canon_sha256":"bb5ed21afdda86a6bf2f15007a370541c994ec32aedc8204838661b2dcac9f64"},"schema_version":"1.0","source":{"id":"1812.00693","kind":"arxiv","version":1}},"canonical_sha256":"57b7788a90831eef0b89780e015c6e6aa9514435ab797ce12338aa58d31f7041","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"57b7788a90831eef0b89780e015c6e6aa9514435ab797ce12338aa58d31f7041","first_computed_at":"2026-05-17T23:53:57.257400Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:53:57.257400Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"o0AWQk0e7qXYzCLivqXBnYfRvctIAUZGuXsArpoC1v9iLlz8pJH3k4CUAGmiz5fgbz0i7eHK378p1t7GHsrSBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:53:57.257930Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.00693","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3e32b99f03a9ee07dec768a1c0d7498e9636415e49524ab793212cd594470bc","sha256:bc0fc3e23a1a9d3aa6e8ba6f678083e06697c6722c9ebf5cdae3638bdb708e91"],"state_sha256":"27d62c5870a3156015dbc3e4b124ba1b581f09300da9451540049c7ec511ff5c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G4H6l9Et70Nik5314UdQMAXq973rL5KU3v6whfM8nLfw3GF4B0p+qCJ/LkuV9UWLgSLKMBIbe4wb4qUPuR5CDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T08:46:02.558077Z","bundle_sha256":"904a470082dd99af2ab34a8f798f666dfbb9008cb8a700a57a3c617cbaf18564"}}