{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:5NQYU44QEDDTFIT6UIYFVPP5H4","short_pith_number":"pith:5NQYU44Q","canonical_record":{"source":{"id":"2503.18342","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-03-24T05:02:09Z","cross_cats_sorted":["eess.IV"],"title_canon_sha256":"5a7b40f321d487343164edc11d0e20297a4396d362f11c651e2e4cccb8b39185","abstract_canon_sha256":"8c98b951f9b76c47334b7da1bcf845341551e2d12674d3c25dc7291f8b78ee33"},"schema_version":"1.0"},"canonical_sha256":"eb618a739020c732a27ea2305abdfd3f0de32e4862c214b23230b16f9c4ea63a","source":{"kind":"arxiv","id":"2503.18342","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2503.18342","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"arxiv_version","alias_value":"2503.18342v1","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2503.18342","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"pith_short_12","alias_value":"5NQYU44QEDDT","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"pith_short_16","alias_value":"5NQYU44QEDDTFIT6","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"pith_short_8","alias_value":"5NQYU44Q","created_at":"2026-07-05T11:37:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:5NQYU44QEDDTFIT6UIYFVPP5H4","target":"record","payload":{"canonical_record":{"source":{"id":"2503.18342","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-03-24T05:02:09Z","cross_cats_sorted":["eess.IV"],"title_canon_sha256":"5a7b40f321d487343164edc11d0e20297a4396d362f11c651e2e4cccb8b39185","abstract_canon_sha256":"8c98b951f9b76c47334b7da1bcf845341551e2d12674d3c25dc7291f8b78ee33"},"schema_version":"1.0"},"canonical_sha256":"eb618a739020c732a27ea2305abdfd3f0de32e4862c214b23230b16f9c4ea63a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:37:17.210286Z","signature_b64":"3cYuAfpQ9kfF6okPp38zvZD9bBcsJrHEBUJj2SQKwV1afJiz0f+Wt0KchOWclNCL6TA5rxjLP29JdAw5aTdIDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb618a739020c732a27ea2305abdfd3f0de32e4862c214b23230b16f9c4ea63a","last_reissued_at":"2026-07-05T11:37:17.209777Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:37:17.209777Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2503.18342","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":"2026-07-05T11:37:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XlfTp8rHVi9hDPUzSYxg2Tn5xrul1JDu53VLbYkwsK0vkDirl0NRlICs7mFriKvhEMimcMHOHeLgSyGwc/4gDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-17T13:20:06.392692Z"},"content_sha256":"c6bd8b35539f54df0d7f2bac7722de00ebcd88f0638400f712ca689a62f8ce26","schema_version":"1.0","event_id":"sha256:c6bd8b35539f54df0d7f2bac7722de00ebcd88f0638400f712ca689a62f8ce26"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:5NQYU44QEDDTFIT6UIYFVPP5H4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Limited-angle SPECT image reconstruction using deep image prior","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.IV"],"primary_cat":"physics.med-ph","authors_text":"Fumio Hashimoto, Kazuya Koyama, Kensuke Hori, Takeyuki Hashimoto","submitted_at":"2025-03-24T05:02:09Z","abstract_excerpt":"In SPECT image reconstruction, limited-angle (LA) conditions lead to a loss of frequency components, which distort the reconstructed tomographic image along directions corresponding to the non-collected projection angle range. Although conventional iterative image reconstruction methods have been used to improve the reconstructed images in LA conditions, the image quality is still unsuitable for clinical use. We propose a LA SPECT image reconstruction method that uses an end-to-end deep image prior (DIP) framework to improve reconstructed image quality. The proposed LA SPECT image reconstructi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.18342","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/2503.18342/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":"2026-07-05T11:37:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"um4SaMqLAno67sIRAKx7wZEmqFLv2z1uTe7qQ1zY1zSldxMLMwnPoToBzQw7NUU52mlUtZfqzCW2/lizTebSDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-17T13:20:06.393065Z"},"content_sha256":"6303e3cf5f41ef6014760b1d2a64ed84beaeb64bda29adb4272db4bfea4ae5cb","schema_version":"1.0","event_id":"sha256:6303e3cf5f41ef6014760b1d2a64ed84beaeb64bda29adb4272db4bfea4ae5cb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5NQYU44QEDDTFIT6UIYFVPP5H4/bundle.json","state_url":"https://pith.science/pith/5NQYU44QEDDTFIT6UIYFVPP5H4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5NQYU44QEDDTFIT6UIYFVPP5H4/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":"2026-07-17T13:20:06Z","links":{"resolver":"https://pith.science/pith/5NQYU44QEDDTFIT6UIYFVPP5H4","bundle":"https://pith.science/pith/5NQYU44QEDDTFIT6UIYFVPP5H4/bundle.json","state":"https://pith.science/pith/5NQYU44QEDDTFIT6UIYFVPP5H4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5NQYU44QEDDTFIT6UIYFVPP5H4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:5NQYU44QEDDTFIT6UIYFVPP5H4","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":"8c98b951f9b76c47334b7da1bcf845341551e2d12674d3c25dc7291f8b78ee33","cross_cats_sorted":["eess.IV"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-03-24T05:02:09Z","title_canon_sha256":"5a7b40f321d487343164edc11d0e20297a4396d362f11c651e2e4cccb8b39185"},"schema_version":"1.0","source":{"id":"2503.18342","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2503.18342","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"arxiv_version","alias_value":"2503.18342v1","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2503.18342","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"pith_short_12","alias_value":"5NQYU44QEDDT","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"pith_short_16","alias_value":"5NQYU44QEDDTFIT6","created_at":"2026-07-05T11:37:17Z"},{"alias_kind":"pith_short_8","alias_value":"5NQYU44Q","created_at":"2026-07-05T11:37:17Z"}],"graph_snapshots":[{"event_id":"sha256:6303e3cf5f41ef6014760b1d2a64ed84beaeb64bda29adb4272db4bfea4ae5cb","target":"graph","created_at":"2026-07-05T11:37:17Z","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/2503.18342/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In SPECT image reconstruction, limited-angle (LA) conditions lead to a loss of frequency components, which distort the reconstructed tomographic image along directions corresponding to the non-collected projection angle range. Although conventional iterative image reconstruction methods have been used to improve the reconstructed images in LA conditions, the image quality is still unsuitable for clinical use. We propose a LA SPECT image reconstruction method that uses an end-to-end deep image prior (DIP) framework to improve reconstructed image quality. The proposed LA SPECT image reconstructi","authors_text":"Fumio Hashimoto, Kazuya Koyama, Kensuke Hori, Takeyuki Hashimoto","cross_cats":["eess.IV"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-03-24T05:02:09Z","title":"Limited-angle SPECT image reconstruction using deep image prior"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.18342","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:c6bd8b35539f54df0d7f2bac7722de00ebcd88f0638400f712ca689a62f8ce26","target":"record","created_at":"2026-07-05T11:37:17Z","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":"8c98b951f9b76c47334b7da1bcf845341551e2d12674d3c25dc7291f8b78ee33","cross_cats_sorted":["eess.IV"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2025-03-24T05:02:09Z","title_canon_sha256":"5a7b40f321d487343164edc11d0e20297a4396d362f11c651e2e4cccb8b39185"},"schema_version":"1.0","source":{"id":"2503.18342","kind":"arxiv","version":1}},"canonical_sha256":"eb618a739020c732a27ea2305abdfd3f0de32e4862c214b23230b16f9c4ea63a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eb618a739020c732a27ea2305abdfd3f0de32e4862c214b23230b16f9c4ea63a","first_computed_at":"2026-07-05T11:37:17.209777Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:37:17.209777Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3cYuAfpQ9kfF6okPp38zvZD9bBcsJrHEBUJj2SQKwV1afJiz0f+Wt0KchOWclNCL6TA5rxjLP29JdAw5aTdIDA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:37:17.210286Z","signed_message":"canonical_sha256_bytes"},"source_id":"2503.18342","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c6bd8b35539f54df0d7f2bac7722de00ebcd88f0638400f712ca689a62f8ce26","sha256:6303e3cf5f41ef6014760b1d2a64ed84beaeb64bda29adb4272db4bfea4ae5cb"],"state_sha256":"c5d50a547d2a5c3f4953100eb8a5ead92d9209163df63b04c33eef242491a883"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C0lHWaOYFBLXPyv8lpYi+qRKIEiV6rT1A5inKK+BKII0zTEB2kqo9zYz0QZPz6hnWAG7xVhQqhoKcGZSLKc7DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-17T13:20:06.396142Z","bundle_sha256":"660d7fb2711e79bdddc6b02b8782dcd5be0cfb402eb526914a825d8f82c542c3"}}