{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:53LA5WKMEA4FNPV2S3O25WFE3D","short_pith_number":"pith:53LA5WKM","canonical_record":{"source":{"id":"2307.11258","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-07-20T22:32:09Z","cross_cats_sorted":[],"title_canon_sha256":"7eeee04196ae302f69a22bd46ffb9159ce74367b4498319efd0cd3e957a4d95a","abstract_canon_sha256":"b259828562f4595e347c395db376c961046dff8c6a032e9123a6a76653f38d6f"},"schema_version":"1.0"},"canonical_sha256":"eed60ed94c203856beba96ddaed8a4d8d6098c69059b6d53e60e9d503addbf58","source":{"kind":"arxiv","id":"2307.11258","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.11258","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"arxiv_version","alias_value":"2307.11258v1","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.11258","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"pith_short_12","alias_value":"53LA5WKMEA4F","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"pith_short_16","alias_value":"53LA5WKMEA4FNPV2","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"pith_short_8","alias_value":"53LA5WKM","created_at":"2026-07-05T06:33:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:53LA5WKMEA4FNPV2S3O25WFE3D","target":"record","payload":{"canonical_record":{"source":{"id":"2307.11258","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-07-20T22:32:09Z","cross_cats_sorted":[],"title_canon_sha256":"7eeee04196ae302f69a22bd46ffb9159ce74367b4498319efd0cd3e957a4d95a","abstract_canon_sha256":"b259828562f4595e347c395db376c961046dff8c6a032e9123a6a76653f38d6f"},"schema_version":"1.0"},"canonical_sha256":"eed60ed94c203856beba96ddaed8a4d8d6098c69059b6d53e60e9d503addbf58","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:33:25.140985Z","signature_b64":"C8A4PbwPQruUvfQIYIm8XNpKzYMSu01YDQKTsDEUWCz297q0Oga1BklpKeQ4iDKxHJdzjktnSZqtEjYT1lQpBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eed60ed94c203856beba96ddaed8a4d8d6098c69059b6d53e60e9d503addbf58","last_reissued_at":"2026-07-05T06:33:25.140641Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:33:25.140641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2307.11258","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":"2026-07-05T06:33:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yKjsD/iddfUCNB9znP8FlGg2PcAQKjT94J96Xnu20xXiOvtmQBGV6LaS7S6pLBwwMviYRDrGJ2ayApV8bNLhAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T17:24:29.802100Z"},"content_sha256":"9c9c8ed61394e37183cdf96160ed8c999d457d39c44c29e5bec1a4d5aa2d4712","schema_version":"1.0","event_id":"sha256:9c9c8ed61394e37183cdf96160ed8c999d457d39c44c29e5bec1a4d5aa2d4712"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:53LA5WKMEA4FNPV2S3O25WFE3D","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On Optimality in ROVir","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Justin P. Haldar","submitted_at":"2023-07-20T22:32:09Z","abstract_excerpt":"We recently published an approach named ROVir (Region-Optimized Virtual coils) that uses the beamforming capabilities of a multichannel magnetic resonance imaging (MRI) receiver array to achieve coil compression (reducing an original set of receiver channels into a much smaller number of virtual channels for the purposes of dimensionality reduction), while simultaneously preserving the MRI signal from desired spatial regions and suppressing the MRI signal arising from unwanted spatial regions. The original ROVir procedure is computationally-simple to implement (involving just a single small ge"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.11258","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/2307.11258/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":"2026-07-05T06:33:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"605ppPhQfxA5GZYHK1y24HA62jeOTkfEMqKMpXpR6F9s2EmBlP9IJ4yBMjCFf2Vv8Sa3rYVteTLaBXLWC3SEAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T17:24:29.802773Z"},"content_sha256":"6664ce0bfa3b0c11490aa56d358e645b3fd7a3450719ed5b14be1b119bdcfc29","schema_version":"1.0","event_id":"sha256:6664ce0bfa3b0c11490aa56d358e645b3fd7a3450719ed5b14be1b119bdcfc29"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/53LA5WKMEA4FNPV2S3O25WFE3D/bundle.json","state_url":"https://pith.science/pith/53LA5WKMEA4FNPV2S3O25WFE3D/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/53LA5WKMEA4FNPV2S3O25WFE3D/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":"2026-08-04T17:24:29Z","links":{"resolver":"https://pith.science/pith/53LA5WKMEA4FNPV2S3O25WFE3D","bundle":"https://pith.science/pith/53LA5WKMEA4FNPV2S3O25WFE3D/bundle.json","state":"https://pith.science/pith/53LA5WKMEA4FNPV2S3O25WFE3D/state.json","well_known_bundle":"https://pith.science/.well-known/pith/53LA5WKMEA4FNPV2S3O25WFE3D/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:53LA5WKMEA4FNPV2S3O25WFE3D","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":"b259828562f4595e347c395db376c961046dff8c6a032e9123a6a76653f38d6f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-07-20T22:32:09Z","title_canon_sha256":"7eeee04196ae302f69a22bd46ffb9159ce74367b4498319efd0cd3e957a4d95a"},"schema_version":"1.0","source":{"id":"2307.11258","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.11258","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"arxiv_version","alias_value":"2307.11258v1","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.11258","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"pith_short_12","alias_value":"53LA5WKMEA4F","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"pith_short_16","alias_value":"53LA5WKMEA4FNPV2","created_at":"2026-07-05T06:33:25Z"},{"alias_kind":"pith_short_8","alias_value":"53LA5WKM","created_at":"2026-07-05T06:33:25Z"}],"graph_snapshots":[{"event_id":"sha256:6664ce0bfa3b0c11490aa56d358e645b3fd7a3450719ed5b14be1b119bdcfc29","target":"graph","created_at":"2026-07-05T06:33:25Z","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/2307.11258/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We recently published an approach named ROVir (Region-Optimized Virtual coils) that uses the beamforming capabilities of a multichannel magnetic resonance imaging (MRI) receiver array to achieve coil compression (reducing an original set of receiver channels into a much smaller number of virtual channels for the purposes of dimensionality reduction), while simultaneously preserving the MRI signal from desired spatial regions and suppressing the MRI signal arising from unwanted spatial regions. The original ROVir procedure is computationally-simple to implement (involving just a single small ge","authors_text":"Justin P. Haldar","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-07-20T22:32:09Z","title":"On Optimality in ROVir"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.11258","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":"sha256:9c9c8ed61394e37183cdf96160ed8c999d457d39c44c29e5bec1a4d5aa2d4712","target":"record","created_at":"2026-07-05T06:33:25Z","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":"b259828562f4595e347c395db376c961046dff8c6a032e9123a6a76653f38d6f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-07-20T22:32:09Z","title_canon_sha256":"7eeee04196ae302f69a22bd46ffb9159ce74367b4498319efd0cd3e957a4d95a"},"schema_version":"1.0","source":{"id":"2307.11258","kind":"arxiv","version":1}},"canonical_sha256":"eed60ed94c203856beba96ddaed8a4d8d6098c69059b6d53e60e9d503addbf58","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eed60ed94c203856beba96ddaed8a4d8d6098c69059b6d53e60e9d503addbf58","first_computed_at":"2026-07-05T06:33:25.140641Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:33:25.140641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C8A4PbwPQruUvfQIYIm8XNpKzYMSu01YDQKTsDEUWCz297q0Oga1BklpKeQ4iDKxHJdzjktnSZqtEjYT1lQpBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T06:33:25.140985Z","signed_message":"canonical_sha256_bytes"},"source_id":"2307.11258","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9c9c8ed61394e37183cdf96160ed8c999d457d39c44c29e5bec1a4d5aa2d4712","sha256:6664ce0bfa3b0c11490aa56d358e645b3fd7a3450719ed5b14be1b119bdcfc29"],"state_sha256":"988af390edbef858d035b7db3aa2e014091f1194185c5323e45306e880860d12"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LeYUR28Rk6DOUF3O2w02e7SywS1M6ClkWu0eXDI89vIpHW0iS72vICGrKiEsJYyjzltfVDxWj8JdaA1Dch3qBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T17:24:29.808139Z","bundle_sha256":"be1aa551424587656e5d57c0ea4dce6514858d9f1b31f142c1962a0000614c66"}}