{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:USHA6MWUL3QCZHCYOQEW4PV7EV","short_pith_number":"pith:USHA6MWU","canonical_record":{"source":{"id":"1802.09313","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-02-26T14:22:19Z","cross_cats_sorted":[],"title_canon_sha256":"05867f84fcd72772ee3fcd078b730d8b4aa2dc649ca5590a1cf741726cac5f16","abstract_canon_sha256":"971002c79d0623d7a80c6c4ebeff22b7b29c13b2d91ae09230d7f46d1e4a1bf5"},"schema_version":"1.0"},"canonical_sha256":"a48e0f32d45ee02c9c5874096e3ebf25498dd9beb344c62cfeb15afd3f36b4d3","source":{"kind":"arxiv","id":"1802.09313","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.09313","created_at":"2026-05-18T00:22:34Z"},{"alias_kind":"arxiv_version","alias_value":"1802.09313v1","created_at":"2026-05-18T00:22:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.09313","created_at":"2026-05-18T00:22:34Z"},{"alias_kind":"pith_short_12","alias_value":"USHA6MWUL3QC","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"USHA6MWUL3QCZHCY","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"USHA6MWU","created_at":"2026-05-18T12:32:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:USHA6MWUL3QCZHCYOQEW4PV7EV","target":"record","payload":{"canonical_record":{"source":{"id":"1802.09313","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-02-26T14:22:19Z","cross_cats_sorted":[],"title_canon_sha256":"05867f84fcd72772ee3fcd078b730d8b4aa2dc649ca5590a1cf741726cac5f16","abstract_canon_sha256":"971002c79d0623d7a80c6c4ebeff22b7b29c13b2d91ae09230d7f46d1e4a1bf5"},"schema_version":"1.0"},"canonical_sha256":"a48e0f32d45ee02c9c5874096e3ebf25498dd9beb344c62cfeb15afd3f36b4d3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:22:34.124666Z","signature_b64":"Q7oIHny0pdtdoKwY8jNgxQyECwfN0nFQYCRWsS/oWA93YT+RdOhZAGIDt83cmU+FMasecHg6P3iRBGTIsUlhBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a48e0f32d45ee02c9c5874096e3ebf25498dd9beb344c62cfeb15afd3f36b4d3","last_reissued_at":"2026-05-18T00:22:34.123960Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:22:34.123960Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.09313","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":"2026-05-18T00:22:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zDknPADmTAkrq5x2SWAyzbRtw3q0ZaNbUzMgZy1Hc3TkmLQd3+zitedJJl8LwJN5N28DpB2PyrYJNNX2diHeDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T16:20:18.723688Z"},"content_sha256":"83e0aaaea4e9a3333c6906ea9d9acc088b0a928109d767abd041a296ed1a3f0b","schema_version":"1.0","event_id":"sha256:83e0aaaea4e9a3333c6906ea9d9acc088b0a928109d767abd041a296ed1a3f0b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:USHA6MWUL3QCZHCYOQEW4PV7EV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Model-Based Photoacoustic Image Reconstruction using Compressed Sensing and Smoothed L0 Norm","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Ali Mahloojifar, Mahdi Orooji, Moein Mozaffarzadeh, Mohammadreza Nasiriavanaki","submitted_at":"2018-02-26T14:22:19Z","abstract_excerpt":"Photoacoustic imaging (PAI) is a novel medical imaging modality that uses the advantages of the spatial resolution of ultrasound imaging and the high contrast of pure optical imaging. Analytical algorithms are usually employed to reconstruct the photoacoustic (PA) images as a result of their simple implementation. However, they provide a low accurate image. Model-based (MB) algorithms are used to improve the image quality and accuracy while a large number of transducers and data acquisition are needed. In this paper, we have combined the theory of compressed sensing (CS) with MB algorithms to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.09313","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":"2026-05-18T00:22:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2jRZwbGqkcEwYYMKun89SeOZcyKkmb9ND6daI8DpWXicwprtSgAqnx4qRqZ/1JA2cV/9640LPPRR6eek29HKBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T16:20:18.724042Z"},"content_sha256":"c521be37e3ce64397b9c755ae8a8e784d9cc525ef2ee37d91173f15ce8d0f8d7","schema_version":"1.0","event_id":"sha256:c521be37e3ce64397b9c755ae8a8e784d9cc525ef2ee37d91173f15ce8d0f8d7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/USHA6MWUL3QCZHCYOQEW4PV7EV/bundle.json","state_url":"https://pith.science/pith/USHA6MWUL3QCZHCYOQEW4PV7EV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/USHA6MWUL3QCZHCYOQEW4PV7EV/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":"2026-06-05T16:20:18Z","links":{"resolver":"https://pith.science/pith/USHA6MWUL3QCZHCYOQEW4PV7EV","bundle":"https://pith.science/pith/USHA6MWUL3QCZHCYOQEW4PV7EV/bundle.json","state":"https://pith.science/pith/USHA6MWUL3QCZHCYOQEW4PV7EV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/USHA6MWUL3QCZHCYOQEW4PV7EV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:USHA6MWUL3QCZHCYOQEW4PV7EV","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":"971002c79d0623d7a80c6c4ebeff22b7b29c13b2d91ae09230d7f46d1e4a1bf5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-02-26T14:22:19Z","title_canon_sha256":"05867f84fcd72772ee3fcd078b730d8b4aa2dc649ca5590a1cf741726cac5f16"},"schema_version":"1.0","source":{"id":"1802.09313","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.09313","created_at":"2026-05-18T00:22:34Z"},{"alias_kind":"arxiv_version","alias_value":"1802.09313v1","created_at":"2026-05-18T00:22:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.09313","created_at":"2026-05-18T00:22:34Z"},{"alias_kind":"pith_short_12","alias_value":"USHA6MWUL3QC","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"USHA6MWUL3QCZHCY","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"USHA6MWU","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:c521be37e3ce64397b9c755ae8a8e784d9cc525ef2ee37d91173f15ce8d0f8d7","target":"graph","created_at":"2026-05-18T00:22:34Z","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":"Photoacoustic imaging (PAI) is a novel medical imaging modality that uses the advantages of the spatial resolution of ultrasound imaging and the high contrast of pure optical imaging. Analytical algorithms are usually employed to reconstruct the photoacoustic (PA) images as a result of their simple implementation. However, they provide a low accurate image. Model-based (MB) algorithms are used to improve the image quality and accuracy while a large number of transducers and data acquisition are needed. In this paper, we have combined the theory of compressed sensing (CS) with MB algorithms to ","authors_text":"Ali Mahloojifar, Mahdi Orooji, Moein Mozaffarzadeh, Mohammadreza Nasiriavanaki","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-02-26T14:22:19Z","title":"Model-Based Photoacoustic Image Reconstruction using Compressed Sensing and Smoothed L0 Norm"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.09313","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":"sha256:83e0aaaea4e9a3333c6906ea9d9acc088b0a928109d767abd041a296ed1a3f0b","target":"record","created_at":"2026-05-18T00:22:34Z","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":"971002c79d0623d7a80c6c4ebeff22b7b29c13b2d91ae09230d7f46d1e4a1bf5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-02-26T14:22:19Z","title_canon_sha256":"05867f84fcd72772ee3fcd078b730d8b4aa2dc649ca5590a1cf741726cac5f16"},"schema_version":"1.0","source":{"id":"1802.09313","kind":"arxiv","version":1}},"canonical_sha256":"a48e0f32d45ee02c9c5874096e3ebf25498dd9beb344c62cfeb15afd3f36b4d3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a48e0f32d45ee02c9c5874096e3ebf25498dd9beb344c62cfeb15afd3f36b4d3","first_computed_at":"2026-05-18T00:22:34.123960Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:22:34.123960Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Q7oIHny0pdtdoKwY8jNgxQyECwfN0nFQYCRWsS/oWA93YT+RdOhZAGIDt83cmU+FMasecHg6P3iRBGTIsUlhBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:22:34.124666Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.09313","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:83e0aaaea4e9a3333c6906ea9d9acc088b0a928109d767abd041a296ed1a3f0b","sha256:c521be37e3ce64397b9c755ae8a8e784d9cc525ef2ee37d91173f15ce8d0f8d7"],"state_sha256":"c81fd4dc4f76608051ede17a8e795d1e2092ef52b8957e0143a9075bf3f7a6b1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i+1DTIKz3Z64EgfAyYzSFbOBQIg4U5ksiJ9ZaQocX4eCyaevFRDwoC/OYk6o+Fq2xz8AQe3El7ObTsfbolq5Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T16:20:18.726123Z","bundle_sha256":"aec013c7546173841b723b0aa7c00805fb607bac0e8246c7648bd9f5852a0ea0"}}