{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:7EIFLHHL3HNK3ETAQXWM7RGDQX","short_pith_number":"pith:7EIFLHHL","canonical_record":{"source":{"id":"1810.07930","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-10-18T07:25:58Z","cross_cats_sorted":[],"title_canon_sha256":"cb8677ed4c7f0bb7ba905ef6ab3dd2420088dca20a838698f0fc2a11422f1134","abstract_canon_sha256":"96ef4d44667aeeee6ce00304aa5e3bb57df1ccd4f27aa237cdfaf7dd04145c18"},"schema_version":"1.0"},"canonical_sha256":"f910559cebd9daad926085eccfc4c385fc744e804acbe7638a66ce4949a4280a","source":{"kind":"arxiv","id":"1810.07930","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.07930","created_at":"2026-05-18T00:02:53Z"},{"alias_kind":"arxiv_version","alias_value":"1810.07930v1","created_at":"2026-05-18T00:02:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.07930","created_at":"2026-05-18T00:02:53Z"},{"alias_kind":"pith_short_12","alias_value":"7EIFLHHL3HNK","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7EIFLHHL3HNK3ETA","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7EIFLHHL","created_at":"2026-05-18T12:32:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:7EIFLHHL3HNK3ETAQXWM7RGDQX","target":"record","payload":{"canonical_record":{"source":{"id":"1810.07930","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-10-18T07:25:58Z","cross_cats_sorted":[],"title_canon_sha256":"cb8677ed4c7f0bb7ba905ef6ab3dd2420088dca20a838698f0fc2a11422f1134","abstract_canon_sha256":"96ef4d44667aeeee6ce00304aa5e3bb57df1ccd4f27aa237cdfaf7dd04145c18"},"schema_version":"1.0"},"canonical_sha256":"f910559cebd9daad926085eccfc4c385fc744e804acbe7638a66ce4949a4280a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:53.726380Z","signature_b64":"CAwTi6gVe7eFwuehV7ChkTF9+m+kmM6MC0CGahNMjEN0vyseOtXgpzX0zXNgu7J7dMcAWtyaXEgqqor2EkzwBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f910559cebd9daad926085eccfc4c385fc744e804acbe7638a66ce4949a4280a","last_reissued_at":"2026-05-18T00:02:53.725638Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:53.725638Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.07930","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":"2026-05-18T00:02:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hy2JotfXEmbjha+SVcrlNh1GdfS5aio/viAN/2iZCU8vn/qPm6I5ZjMk+QuVPqbkELWKesScTDgA3i4kyYGbCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T18:22:33.582426Z"},"content_sha256":"45643c1a43014b255d265b93cf814eb727073ea450d723d80417deac307559c7","schema_version":"1.0","event_id":"sha256:45643c1a43014b255d265b93cf814eb727073ea450d723d80417deac307559c7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:7EIFLHHL3HNK3ETAQXWM7RGDQX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"R1 dispersion contrast at high field with fast field-cycling MRI","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Andreas Petrovic, Christian G\\\"osweiner, DanutaKruk, Evrim Umut, Hermann Scharfetter, Maria Francesca Casula, Markus B\\\"odenler, Martina Basini","submitted_at":"2018-10-18T07:25:58Z","abstract_excerpt":"Contrast agents with a strong $R_1$ dispersion have been shown to be effective in generating target-specific contrast in MRI. The utilization of this $R_1$ field dependence requires the adaptation of a MRI scanner for fast field-cycling (FFC). Here, we present the first implementation and validation of FFC-MRI at a clinical field strength of 3 T. A field-cycling range of $\\pm$100 mT around the nominal $B_0$ field was realized by inserting an additional insert coil into an otherwise conventional MRI system. System validation was successfully performed with selected iron oxide magnetic nanoparti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.07930","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":"2026-05-18T00:02:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wxjJZDfSOZ9eoNuGg1juMPUE35WHk60b46OmG6tm686fAy+OxWyaX/37HANTtthgext7wPtrnxkmPqir1+1WCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T18:22:33.583174Z"},"content_sha256":"91486933f90bac2b15bb37aca8a9b1926c27a8369eaa464f637d689b713d1dde","schema_version":"1.0","event_id":"sha256:91486933f90bac2b15bb37aca8a9b1926c27a8369eaa464f637d689b713d1dde"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7EIFLHHL3HNK3ETAQXWM7RGDQX/bundle.json","state_url":"https://pith.science/pith/7EIFLHHL3HNK3ETAQXWM7RGDQX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7EIFLHHL3HNK3ETAQXWM7RGDQX/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":"2026-05-29T18:22:33Z","links":{"resolver":"https://pith.science/pith/7EIFLHHL3HNK3ETAQXWM7RGDQX","bundle":"https://pith.science/pith/7EIFLHHL3HNK3ETAQXWM7RGDQX/bundle.json","state":"https://pith.science/pith/7EIFLHHL3HNK3ETAQXWM7RGDQX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7EIFLHHL3HNK3ETAQXWM7RGDQX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:7EIFLHHL3HNK3ETAQXWM7RGDQX","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":"96ef4d44667aeeee6ce00304aa5e3bb57df1ccd4f27aa237cdfaf7dd04145c18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-10-18T07:25:58Z","title_canon_sha256":"cb8677ed4c7f0bb7ba905ef6ab3dd2420088dca20a838698f0fc2a11422f1134"},"schema_version":"1.0","source":{"id":"1810.07930","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.07930","created_at":"2026-05-18T00:02:53Z"},{"alias_kind":"arxiv_version","alias_value":"1810.07930v1","created_at":"2026-05-18T00:02:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.07930","created_at":"2026-05-18T00:02:53Z"},{"alias_kind":"pith_short_12","alias_value":"7EIFLHHL3HNK","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7EIFLHHL3HNK3ETA","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7EIFLHHL","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:91486933f90bac2b15bb37aca8a9b1926c27a8369eaa464f637d689b713d1dde","target":"graph","created_at":"2026-05-18T00:02:53Z","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":"Contrast agents with a strong $R_1$ dispersion have been shown to be effective in generating target-specific contrast in MRI. The utilization of this $R_1$ field dependence requires the adaptation of a MRI scanner for fast field-cycling (FFC). Here, we present the first implementation and validation of FFC-MRI at a clinical field strength of 3 T. A field-cycling range of $\\pm$100 mT around the nominal $B_0$ field was realized by inserting an additional insert coil into an otherwise conventional MRI system. System validation was successfully performed with selected iron oxide magnetic nanoparti","authors_text":"Andreas Petrovic, Christian G\\\"osweiner, DanutaKruk, Evrim Umut, Hermann Scharfetter, Maria Francesca Casula, Markus B\\\"odenler, Martina Basini","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-10-18T07:25:58Z","title":"R1 dispersion contrast at high field with fast field-cycling MRI"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.07930","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":"sha256:45643c1a43014b255d265b93cf814eb727073ea450d723d80417deac307559c7","target":"record","created_at":"2026-05-18T00:02:53Z","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":"96ef4d44667aeeee6ce00304aa5e3bb57df1ccd4f27aa237cdfaf7dd04145c18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2018-10-18T07:25:58Z","title_canon_sha256":"cb8677ed4c7f0bb7ba905ef6ab3dd2420088dca20a838698f0fc2a11422f1134"},"schema_version":"1.0","source":{"id":"1810.07930","kind":"arxiv","version":1}},"canonical_sha256":"f910559cebd9daad926085eccfc4c385fc744e804acbe7638a66ce4949a4280a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f910559cebd9daad926085eccfc4c385fc744e804acbe7638a66ce4949a4280a","first_computed_at":"2026-05-18T00:02:53.725638Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:53.725638Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CAwTi6gVe7eFwuehV7ChkTF9+m+kmM6MC0CGahNMjEN0vyseOtXgpzX0zXNgu7J7dMcAWtyaXEgqqor2EkzwBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:53.726380Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.07930","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:45643c1a43014b255d265b93cf814eb727073ea450d723d80417deac307559c7","sha256:91486933f90bac2b15bb37aca8a9b1926c27a8369eaa464f637d689b713d1dde"],"state_sha256":"9f898d1bcb3847c4de826689bb1306656c8eb4a12fb2c26dca924f344219529b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SrErv7qUQlr8PIKnVDy+XRWUGbt2Q1/f1WCTF6FZUsW5lCG4HYuSyV8TS+6ujxTujaWXYiW6V2wqa4vJ6gBzBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T18:22:33.587423Z","bundle_sha256":"4dd43a42345f8fdd43594d44b930b2b928ddca0f3d7436150e5259e48ec6777b"}}