{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:MO5MUQOTNSCR37IF5UZHUWNJQF","short_pith_number":"pith:MO5MUQOT","canonical_record":{"source":{"id":"1212.5223","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-12-20T20:20:16Z","cross_cats_sorted":["physics.atom-ph","physics.ins-det"],"title_canon_sha256":"5656647262cf74d65516bc6a895730db50ef8c209b6efa8d638c80d4eb3ef664","abstract_canon_sha256":"f25d768618492c735717d618b585cb5824056ca37918b9c8f0fd900f04ad9f8b"},"schema_version":"1.0"},"canonical_sha256":"63baca41d36c851dfd05ed327a59a9816bd7029c11d2047a02e9c3725fdabc3a","source":{"kind":"arxiv","id":"1212.5223","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.5223","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"arxiv_version","alias_value":"1212.5223v1","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.5223","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"pith_short_12","alias_value":"MO5MUQOTNSCR","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"MO5MUQOTNSCR37IF","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"MO5MUQOT","created_at":"2026-05-18T12:27:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:MO5MUQOTNSCR37IF5UZHUWNJQF","target":"record","payload":{"canonical_record":{"source":{"id":"1212.5223","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-12-20T20:20:16Z","cross_cats_sorted":["physics.atom-ph","physics.ins-det"],"title_canon_sha256":"5656647262cf74d65516bc6a895730db50ef8c209b6efa8d638c80d4eb3ef664","abstract_canon_sha256":"f25d768618492c735717d618b585cb5824056ca37918b9c8f0fd900f04ad9f8b"},"schema_version":"1.0"},"canonical_sha256":"63baca41d36c851dfd05ed327a59a9816bd7029c11d2047a02e9c3725fdabc3a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:52:29.592209Z","signature_b64":"sSnwM+Wz1PNAfBVVmUI+XpXM+ZrUjfzlSi69DcvNNuoz88C1BNjw8Q3IovBWfMnknWLAHRUqn200xGZTBalwBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"63baca41d36c851dfd05ed327a59a9816bd7029c11d2047a02e9c3725fdabc3a","last_reissued_at":"2026-05-18T01:52:29.591660Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:52:29.591660Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1212.5223","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":"2026-05-18T01:52:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9WhBKXAOMaXOVmfD3b2xOJVgbnDRVMN0EsPV0tomiutvlQDADhJkdpCdz4zJCIEWP3+nsX+zQV7EyuqzCE2fBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T16:50:05.428826Z"},"content_sha256":"e515697b02323097234c34aecbe1a8b54b90c4aa20c689798216a926e3c0e5f8","schema_version":"1.0","event_id":"sha256:e515697b02323097234c34aecbe1a8b54b90c4aa20c689798216a926e3c0e5f8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:MO5MUQOTNSCR37IF5UZHUWNJQF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Anatomical MRI with an atomic magnetometer","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph","physics.ins-det"],"primary_cat":"physics.med-ph","authors_text":"I. Savukov, T. Karaulanov","submitted_at":"2012-12-20T20:20:16Z","abstract_excerpt":"Ultra-low field (ULF) MRI is a promising method for inexpensive medical imaging with various additional advantages over conventional instruments such as low weight, low power, portability, absence of artifacts from metals, and high contrast. Anatomical ULF MRI has been successfully implemented with SQUIDs, but SQUIDs have the drawback of cryogen requirement. Atomic magnetometers have sensitivity comparable to SQUIDs and can be in principle used for ULF MRI to replace SQUIDs. Unfortunately some problems exist due to the sensitivity of atomic magnetometers to magnetic field and gradients. At low"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.5223","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":"2026-05-18T01:52:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZTfG417p3bzvm1kjxvSxazAk57cD2+DJW25WZE2Md2QcnsSrs/7KG3oZpppw4FAD6wstIyRnqVVrxhmlXJgfCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T16:50:05.429165Z"},"content_sha256":"084d282ed56eed1c62d343a25cb769abec3aa46a222a8fe2255b593980ce7315","schema_version":"1.0","event_id":"sha256:084d282ed56eed1c62d343a25cb769abec3aa46a222a8fe2255b593980ce7315"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MO5MUQOTNSCR37IF5UZHUWNJQF/bundle.json","state_url":"https://pith.science/pith/MO5MUQOTNSCR37IF5UZHUWNJQF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MO5MUQOTNSCR37IF5UZHUWNJQF/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":"2026-06-26T16:50:05Z","links":{"resolver":"https://pith.science/pith/MO5MUQOTNSCR37IF5UZHUWNJQF","bundle":"https://pith.science/pith/MO5MUQOTNSCR37IF5UZHUWNJQF/bundle.json","state":"https://pith.science/pith/MO5MUQOTNSCR37IF5UZHUWNJQF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MO5MUQOTNSCR37IF5UZHUWNJQF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:MO5MUQOTNSCR37IF5UZHUWNJQF","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":"f25d768618492c735717d618b585cb5824056ca37918b9c8f0fd900f04ad9f8b","cross_cats_sorted":["physics.atom-ph","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-12-20T20:20:16Z","title_canon_sha256":"5656647262cf74d65516bc6a895730db50ef8c209b6efa8d638c80d4eb3ef664"},"schema_version":"1.0","source":{"id":"1212.5223","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.5223","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"arxiv_version","alias_value":"1212.5223v1","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.5223","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"pith_short_12","alias_value":"MO5MUQOTNSCR","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"MO5MUQOTNSCR37IF","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"MO5MUQOT","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:084d282ed56eed1c62d343a25cb769abec3aa46a222a8fe2255b593980ce7315","target":"graph","created_at":"2026-05-18T01:52:29Z","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":"Ultra-low field (ULF) MRI is a promising method for inexpensive medical imaging with various additional advantages over conventional instruments such as low weight, low power, portability, absence of artifacts from metals, and high contrast. Anatomical ULF MRI has been successfully implemented with SQUIDs, but SQUIDs have the drawback of cryogen requirement. Atomic magnetometers have sensitivity comparable to SQUIDs and can be in principle used for ULF MRI to replace SQUIDs. Unfortunately some problems exist due to the sensitivity of atomic magnetometers to magnetic field and gradients. At low","authors_text":"I. Savukov, T. Karaulanov","cross_cats":["physics.atom-ph","physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-12-20T20:20:16Z","title":"Anatomical MRI with an atomic magnetometer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.5223","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:e515697b02323097234c34aecbe1a8b54b90c4aa20c689798216a926e3c0e5f8","target":"record","created_at":"2026-05-18T01:52:29Z","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":"f25d768618492c735717d618b585cb5824056ca37918b9c8f0fd900f04ad9f8b","cross_cats_sorted":["physics.atom-ph","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2012-12-20T20:20:16Z","title_canon_sha256":"5656647262cf74d65516bc6a895730db50ef8c209b6efa8d638c80d4eb3ef664"},"schema_version":"1.0","source":{"id":"1212.5223","kind":"arxiv","version":1}},"canonical_sha256":"63baca41d36c851dfd05ed327a59a9816bd7029c11d2047a02e9c3725fdabc3a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"63baca41d36c851dfd05ed327a59a9816bd7029c11d2047a02e9c3725fdabc3a","first_computed_at":"2026-05-18T01:52:29.591660Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:52:29.591660Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sSnwM+Wz1PNAfBVVmUI+XpXM+ZrUjfzlSi69DcvNNuoz88C1BNjw8Q3IovBWfMnknWLAHRUqn200xGZTBalwBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:52:29.592209Z","signed_message":"canonical_sha256_bytes"},"source_id":"1212.5223","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e515697b02323097234c34aecbe1a8b54b90c4aa20c689798216a926e3c0e5f8","sha256:084d282ed56eed1c62d343a25cb769abec3aa46a222a8fe2255b593980ce7315"],"state_sha256":"c0af18eafd985d4416016adb67e95a4883d74f89ef9f7294f7564dc733cbff1d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eLNmdYkYs4KPClt/YJNuqXCrKK575z+J6Lukbr8jESx+SPW1yfbwfYsK5GpxK1HG7t0GMhb1IKS/vlZE/fj9DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T16:50:05.431043Z","bundle_sha256":"d38d9eff8975fd105d56a37266664b423a188eab63024207bb4b31f6e8cbe4b8"}}