{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:YQRGGGI2KCIEPFU46XWAB5T5IQ","short_pith_number":"pith:YQRGGGI2","canonical_record":{"source":{"id":"2103.13964","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2021-03-25T16:45:26Z","cross_cats_sorted":[],"title_canon_sha256":"09aa99a0278fe89f8e3d9c227131c3448687d19b2c857fe74b5d01ad2574402b","abstract_canon_sha256":"df53cc5f2e75581ac269b29f916f231a9e8f4166511e474a28a35748adf6e7b7"},"schema_version":"1.0"},"canonical_sha256":"c42263191a509047969cf5ec00f67d441d6e08e9a1fa5efced4e6c86355f9d96","source":{"kind":"arxiv","id":"2103.13964","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.13964","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"arxiv_version","alias_value":"2103.13964v3","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.13964","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"pith_short_12","alias_value":"YQRGGGI2KCIE","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"pith_short_16","alias_value":"YQRGGGI2KCIEPFU4","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"pith_short_8","alias_value":"YQRGGGI2","created_at":"2026-07-05T04:48:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:YQRGGGI2KCIEPFU46XWAB5T5IQ","target":"record","payload":{"canonical_record":{"source":{"id":"2103.13964","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2021-03-25T16:45:26Z","cross_cats_sorted":[],"title_canon_sha256":"09aa99a0278fe89f8e3d9c227131c3448687d19b2c857fe74b5d01ad2574402b","abstract_canon_sha256":"df53cc5f2e75581ac269b29f916f231a9e8f4166511e474a28a35748adf6e7b7"},"schema_version":"1.0"},"canonical_sha256":"c42263191a509047969cf5ec00f67d441d6e08e9a1fa5efced4e6c86355f9d96","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:48:06.886022Z","signature_b64":"jktmFW6SECZFQHOlfqfSsuWuyvJBJ+UvABwN3zR15FyM/TxntkWrJPQpIfWsmWqXkQ/CZ/BVOr0t6l4uwv5TBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c42263191a509047969cf5ec00f67d441d6e08e9a1fa5efced4e6c86355f9d96","last_reissued_at":"2026-07-05T04:48:06.885521Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:48:06.885521Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2103.13964","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:48:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9R2XFOKewOJeTl8DOFSGMyl1IzFhr+yY6ovKBp2TjmqrWjWK7QjI4QyK8G73IBhnkgPZTXyPA7TDUj/khpyrDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-20T15:14:08.186956Z"},"content_sha256":"aa781779d2cb1dd7ebee96706473037c57f362bc5f4a731da399baab026bf049","schema_version":"1.0","event_id":"sha256:aa781779d2cb1dd7ebee96706473037c57f362bc5f4a731da399baab026bf049"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:YQRGGGI2KCIEPFU46XWAB5T5IQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Deep learning-based photoacoustic imaging of vascular network through thick porous media","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Qian Cheng, Weiya Xie, Wenyi Xu, Ya Gao, Yiming Chen","submitted_at":"2021-03-25T16:45:26Z","abstract_excerpt":"Photoacoustic imaging (PAI) is a promising approach to realize in vivo transcranial cerebral vascular imaging. However, the strong attenuation and distortion of the photoacoustic wave caused by the thick porous skull greatly affect the imaging quality. In this study, we designed a convolutional neural network (CNN) with a U-Net architecture to extract the effective photoacoustic information hidden in the speckle patterns; obtained vascular network images datasets under porous media through simulation and experiment, and trained the network weights respectively. The results show that the propos"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.13964","kind":"arxiv","version":3},"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/2103.13964/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":"2026-07-05T04:48:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O7KuYbOVttN4tr0GBbMoPLDlI3uEj2rB1qbOZuiEk/+4he+cDiKLahxBOKxURkI9PMqYDE/vcYoS1BySVYGABA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-20T15:14:08.187338Z"},"content_sha256":"8b43e96421edf8ccd9b1de0320f6698abde4f8588eebe4d7f4a61f7da1240b62","schema_version":"1.0","event_id":"sha256:8b43e96421edf8ccd9b1de0320f6698abde4f8588eebe4d7f4a61f7da1240b62"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YQRGGGI2KCIEPFU46XWAB5T5IQ/bundle.json","state_url":"https://pith.science/pith/YQRGGGI2KCIEPFU46XWAB5T5IQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YQRGGGI2KCIEPFU46XWAB5T5IQ/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":"2026-07-20T15:14:08Z","links":{"resolver":"https://pith.science/pith/YQRGGGI2KCIEPFU46XWAB5T5IQ","bundle":"https://pith.science/pith/YQRGGGI2KCIEPFU46XWAB5T5IQ/bundle.json","state":"https://pith.science/pith/YQRGGGI2KCIEPFU46XWAB5T5IQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YQRGGGI2KCIEPFU46XWAB5T5IQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:YQRGGGI2KCIEPFU46XWAB5T5IQ","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":"df53cc5f2e75581ac269b29f916f231a9e8f4166511e474a28a35748adf6e7b7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2021-03-25T16:45:26Z","title_canon_sha256":"09aa99a0278fe89f8e3d9c227131c3448687d19b2c857fe74b5d01ad2574402b"},"schema_version":"1.0","source":{"id":"2103.13964","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.13964","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"arxiv_version","alias_value":"2103.13964v3","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.13964","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"pith_short_12","alias_value":"YQRGGGI2KCIE","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"pith_short_16","alias_value":"YQRGGGI2KCIEPFU4","created_at":"2026-07-05T04:48:06Z"},{"alias_kind":"pith_short_8","alias_value":"YQRGGGI2","created_at":"2026-07-05T04:48:06Z"}],"graph_snapshots":[{"event_id":"sha256:8b43e96421edf8ccd9b1de0320f6698abde4f8588eebe4d7f4a61f7da1240b62","target":"graph","created_at":"2026-07-05T04:48:06Z","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/2103.13964/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Photoacoustic imaging (PAI) is a promising approach to realize in vivo transcranial cerebral vascular imaging. However, the strong attenuation and distortion of the photoacoustic wave caused by the thick porous skull greatly affect the imaging quality. In this study, we designed a convolutional neural network (CNN) with a U-Net architecture to extract the effective photoacoustic information hidden in the speckle patterns; obtained vascular network images datasets under porous media through simulation and experiment, and trained the network weights respectively. The results show that the propos","authors_text":"Qian Cheng, Weiya Xie, Wenyi Xu, Ya Gao, Yiming Chen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2021-03-25T16:45:26Z","title":"Deep learning-based photoacoustic imaging of vascular network through thick porous media"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.13964","kind":"arxiv","version":3},"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:aa781779d2cb1dd7ebee96706473037c57f362bc5f4a731da399baab026bf049","target":"record","created_at":"2026-07-05T04:48:06Z","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":"df53cc5f2e75581ac269b29f916f231a9e8f4166511e474a28a35748adf6e7b7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2021-03-25T16:45:26Z","title_canon_sha256":"09aa99a0278fe89f8e3d9c227131c3448687d19b2c857fe74b5d01ad2574402b"},"schema_version":"1.0","source":{"id":"2103.13964","kind":"arxiv","version":3}},"canonical_sha256":"c42263191a509047969cf5ec00f67d441d6e08e9a1fa5efced4e6c86355f9d96","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c42263191a509047969cf5ec00f67d441d6e08e9a1fa5efced4e6c86355f9d96","first_computed_at":"2026-07-05T04:48:06.885521Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:48:06.885521Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jktmFW6SECZFQHOlfqfSsuWuyvJBJ+UvABwN3zR15FyM/TxntkWrJPQpIfWsmWqXkQ/CZ/BVOr0t6l4uwv5TBA==","signature_status":"signed_v1","signed_at":"2026-07-05T04:48:06.886022Z","signed_message":"canonical_sha256_bytes"},"source_id":"2103.13964","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aa781779d2cb1dd7ebee96706473037c57f362bc5f4a731da399baab026bf049","sha256:8b43e96421edf8ccd9b1de0320f6698abde4f8588eebe4d7f4a61f7da1240b62"],"state_sha256":"d6477c9f976d09398bc911c05e4ee7c165abb988c3157f0d8169b703ec6b966d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8gj9+/EkM0A748a8vz86T4ZkI6iSQXSIjx5DGJSFuzrION1jSmy9o0oitSjZlTOF/biPrg9Rl+gdneBHxAgcBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-20T15:14:08.189829Z","bundle_sha256":"c3b53687e5f834069565beb1f579fe70b8c61ed2d24bca4ad99b54b498b517f1"}}