{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:QUPYGXQKQE2PSSFERYTELSTBXT","short_pith_number":"pith:QUPYGXQK","canonical_record":{"source":{"id":"2606.20395","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2026-06-18T15:48:26Z","cross_cats_sorted":[],"title_canon_sha256":"08c518109e74bc461b6c01836df228175250e4e29c8c6df42c15288f5d04e930","abstract_canon_sha256":"087117ef03f4f33ac77e6f5f9cc26ca8bcc8584f34627f0087e8aea853390dbc"},"schema_version":"1.0"},"canonical_sha256":"851f835e0a8134f948a48e2645ca61bcf80b6a89df7b30733c28e713ab850a02","source":{"kind":"arxiv","id":"2606.20395","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.20395","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"arxiv_version","alias_value":"2606.20395v1","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.20395","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"pith_short_12","alias_value":"QUPYGXQKQE2P","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"pith_short_16","alias_value":"QUPYGXQKQE2PSSFE","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"pith_short_8","alias_value":"QUPYGXQK","created_at":"2026-06-19T16:13:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:QUPYGXQKQE2PSSFERYTELSTBXT","target":"record","payload":{"canonical_record":{"source":{"id":"2606.20395","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2026-06-18T15:48:26Z","cross_cats_sorted":[],"title_canon_sha256":"08c518109e74bc461b6c01836df228175250e4e29c8c6df42c15288f5d04e930","abstract_canon_sha256":"087117ef03f4f33ac77e6f5f9cc26ca8bcc8584f34627f0087e8aea853390dbc"},"schema_version":"1.0"},"canonical_sha256":"851f835e0a8134f948a48e2645ca61bcf80b6a89df7b30733c28e713ab850a02","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-19T16:13:11.473334Z","signature_b64":"F35jAY656/5OdXVY0UhGz3ljkQYUSOy9+gyiWUI0VF2QdMrMCU0H1cXMRRwzPpmUHfbXTjQoJCGv37M7LECZBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"851f835e0a8134f948a48e2645ca61bcf80b6a89df7b30733c28e713ab850a02","last_reissued_at":"2026-06-19T16:13:11.472966Z","signature_status":"signed_v1","first_computed_at":"2026-06-19T16:13:11.472966Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.20395","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":"2026-06-19T16:13:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BSWse/Am8SjFmyB5VWc840lxeogr680IPs8MhhANtBo+GHMj3ZRJIz4leydyWxj0bZvmVSNDLACGiu65cx+CBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-03T19:48:14.420812Z"},"content_sha256":"f1ce3f80f5cb3c456446eedff4cc86a7649982a3c79e3ec74dbb8565c83029e8","schema_version":"1.0","event_id":"sha256:f1ce3f80f5cb3c456446eedff4cc86a7649982a3c79e3ec74dbb8565c83029e8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:QUPYGXQKQE2PSSFERYTELSTBXT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Efficient and Accurate Image Reconstruction for Geometric-Inconsistent Multispectral CT with Ray-Dependent Energy Spectra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Chong Chen, Ziqiang Zhang","submitted_at":"2026-06-18T15:48:26Z","abstract_excerpt":"In practical multispectral computed tomography (MSCT), the scanning geometric parameters under different X-ray energy spectra are often inconsistent, and the distributions of the energy spectra are even ray-dependent. However, existing algorithms cannot effectively and accurately solve the associated image reconstruction problem. To address this limitation, using the proposed aggregated energy spectra, we approximate the Jacobian matrix of the nonlinear forward operator at certain special points (e.g., the zero point) as a block product of a diagonal matrix composed of projection matrices and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.20395","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.20395/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-06-19T16:13:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ID0dzHGelCcinquxueXwCyrgMF05XalKnRCHdu0P5F38fkgBORTLrTdXra9u6N8lhw56rMUGkUe+RZ/XcPpoAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-03T19:48:14.421171Z"},"content_sha256":"187fb59c79efc2b6fab223c6e7ee4c2bc1721e4c4e2264e1485bdacb713fd8e6","schema_version":"1.0","event_id":"sha256:187fb59c79efc2b6fab223c6e7ee4c2bc1721e4c4e2264e1485bdacb713fd8e6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QUPYGXQKQE2PSSFERYTELSTBXT/bundle.json","state_url":"https://pith.science/pith/QUPYGXQKQE2PSSFERYTELSTBXT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QUPYGXQKQE2PSSFERYTELSTBXT/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":"2026-07-03T19:48:14Z","links":{"resolver":"https://pith.science/pith/QUPYGXQKQE2PSSFERYTELSTBXT","bundle":"https://pith.science/pith/QUPYGXQKQE2PSSFERYTELSTBXT/bundle.json","state":"https://pith.science/pith/QUPYGXQKQE2PSSFERYTELSTBXT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QUPYGXQKQE2PSSFERYTELSTBXT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:QUPYGXQKQE2PSSFERYTELSTBXT","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":"087117ef03f4f33ac77e6f5f9cc26ca8bcc8584f34627f0087e8aea853390dbc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2026-06-18T15:48:26Z","title_canon_sha256":"08c518109e74bc461b6c01836df228175250e4e29c8c6df42c15288f5d04e930"},"schema_version":"1.0","source":{"id":"2606.20395","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.20395","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"arxiv_version","alias_value":"2606.20395v1","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.20395","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"pith_short_12","alias_value":"QUPYGXQKQE2P","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"pith_short_16","alias_value":"QUPYGXQKQE2PSSFE","created_at":"2026-06-19T16:13:11Z"},{"alias_kind":"pith_short_8","alias_value":"QUPYGXQK","created_at":"2026-06-19T16:13:11Z"}],"graph_snapshots":[{"event_id":"sha256:187fb59c79efc2b6fab223c6e7ee4c2bc1721e4c4e2264e1485bdacb713fd8e6","target":"graph","created_at":"2026-06-19T16:13:11Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2606.20395/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In practical multispectral computed tomography (MSCT), the scanning geometric parameters under different X-ray energy spectra are often inconsistent, and the distributions of the energy spectra are even ray-dependent. However, existing algorithms cannot effectively and accurately solve the associated image reconstruction problem. To address this limitation, using the proposed aggregated energy spectra, we approximate the Jacobian matrix of the nonlinear forward operator at certain special points (e.g., the zero point) as a block product of a diagonal matrix composed of projection matrices and ","authors_text":"Chong Chen, Ziqiang Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2026-06-18T15:48:26Z","title":"Efficient and Accurate Image Reconstruction for Geometric-Inconsistent Multispectral CT with Ray-Dependent Energy Spectra"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.20395","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:f1ce3f80f5cb3c456446eedff4cc86a7649982a3c79e3ec74dbb8565c83029e8","target":"record","created_at":"2026-06-19T16:13:11Z","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":"087117ef03f4f33ac77e6f5f9cc26ca8bcc8584f34627f0087e8aea853390dbc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2026-06-18T15:48:26Z","title_canon_sha256":"08c518109e74bc461b6c01836df228175250e4e29c8c6df42c15288f5d04e930"},"schema_version":"1.0","source":{"id":"2606.20395","kind":"arxiv","version":1}},"canonical_sha256":"851f835e0a8134f948a48e2645ca61bcf80b6a89df7b30733c28e713ab850a02","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"851f835e0a8134f948a48e2645ca61bcf80b6a89df7b30733c28e713ab850a02","first_computed_at":"2026-06-19T16:13:11.472966Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-19T16:13:11.472966Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"F35jAY656/5OdXVY0UhGz3ljkQYUSOy9+gyiWUI0VF2QdMrMCU0H1cXMRRwzPpmUHfbXTjQoJCGv37M7LECZBA==","signature_status":"signed_v1","signed_at":"2026-06-19T16:13:11.473334Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.20395","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f1ce3f80f5cb3c456446eedff4cc86a7649982a3c79e3ec74dbb8565c83029e8","sha256:187fb59c79efc2b6fab223c6e7ee4c2bc1721e4c4e2264e1485bdacb713fd8e6"],"state_sha256":"9c679e40a07db1b305d29e987a5c28cb983335554369a17844aca0eb4bf3d1c5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X94npKLfIfqaPTPVO34bbFNGPnpMF5+TU03lcRGq2SRL7jJwaR+FtCN20b2F9K2M2t+Mh2S+q3rpOnBe5p/gCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-03T19:48:14.423083Z","bundle_sha256":"968ad7871101e250359ab7c9e1b9037a13c5d1ff7d737bd7e0ae8d527918379e"}}