{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:EL2B6DAYZKR2WQ7U4S6FH5SNN6","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":"f333492d05b68177f63eee2c7e5feee1b891b5d42ceddc2cdb4670bf56980024","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2023-10-30T21:14:13Z","title_canon_sha256":"b01b327de7b31c2f6cf0d1cda45dee9604a06d926adf54c41f60f0bd70fc244d"},"schema_version":"1.0","source":{"id":"2310.20019","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2310.20019","created_at":"2026-07-05T07:54:52Z"},{"alias_kind":"arxiv_version","alias_value":"2310.20019v1","created_at":"2026-07-05T07:54:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.20019","created_at":"2026-07-05T07:54:52Z"},{"alias_kind":"pith_short_12","alias_value":"EL2B6DAYZKR2","created_at":"2026-07-05T07:54:52Z"},{"alias_kind":"pith_short_16","alias_value":"EL2B6DAYZKR2WQ7U","created_at":"2026-07-05T07:54:52Z"},{"alias_kind":"pith_short_8","alias_value":"EL2B6DAY","created_at":"2026-07-05T07:54:52Z"}],"graph_snapshots":[{"event_id":"sha256:db5888d5dba5ef9ac43d2b8ecb85ab8aa82cb2c4ba09154571135fd53adbe26f","target":"graph","created_at":"2026-07-05T07:54:52Z","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/2310.20019/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Ultra-high field MRI offers unprecedented detail for non-invasive visualization of the human brain. However, brain imaging is challenging at 7T due to the B$_1^+$ field inhomogeneity, which results in signal intensity drops in temporal lobes and a bright region in the brain center. This study aims to evaluate using a metasurface to improve brain imaging at 7T and simplify the investigative workflow. Two flexible metasurfaces, each comprising a periodic structure of copper strips and parallel-plate capacitive elements printed on an ultra-thin substrate, were optimized for brain imaging and impl","authors_text":"Alena Shchelokova, Andrew Webb, Vladislav Koloskov, Wyger Brink","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2023-10-30T21:14:13Z","title":"Flexible metasurface for improving brain imaging at 7T"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.20019","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:f3221e244a6628bdc631577a148eb979cf8106646894f5f3d918c55826cb29b8","target":"record","created_at":"2026-07-05T07:54:52Z","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":"f333492d05b68177f63eee2c7e5feee1b891b5d42ceddc2cdb4670bf56980024","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2023-10-30T21:14:13Z","title_canon_sha256":"b01b327de7b31c2f6cf0d1cda45dee9604a06d926adf54c41f60f0bd70fc244d"},"schema_version":"1.0","source":{"id":"2310.20019","kind":"arxiv","version":1}},"canonical_sha256":"22f41f0c18caa3ab43f4e4bc53f64d6fa561758cf88523d720c23d644ffef39f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"22f41f0c18caa3ab43f4e4bc53f64d6fa561758cf88523d720c23d644ffef39f","first_computed_at":"2026-07-05T07:54:52.624457Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:54:52.624457Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bwE+E2msSWFEewPZauS0xZONowqc+cgRRl2tcAz5ZPdxh7Ih5yLpEBZJer1J2sJ76qkkzbBw73KfbXHQv8rcCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:54:52.624990Z","signed_message":"canonical_sha256_bytes"},"source_id":"2310.20019","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3221e244a6628bdc631577a148eb979cf8106646894f5f3d918c55826cb29b8","sha256:db5888d5dba5ef9ac43d2b8ecb85ab8aa82cb2c4ba09154571135fd53adbe26f"],"state_sha256":"99caa6b96e041a697784154b5226195a23cc55d9e2cb24cba01d70ef747f98cc"}