{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:WJ5Q753PO2TX7LGHA4VKR6GVAT","short_pith_number":"pith:WJ5Q753P","canonical_record":{"source":{"id":"1610.02656","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2016-10-09T10:36:28Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"99abac6f26c33b931d1e3ae488847b028892240eb5439c41ebf3d4379bb632ba","abstract_canon_sha256":"90d8ee88f8028b8482b2dbd2a50873d5c28f467c81f4a6f55b546e116a4c0e50"},"schema_version":"1.0"},"canonical_sha256":"b27b0ff76f76a77facc7072aa8f8d504f4b5b0bd65ed2f8c2e4e7194be27a046","source":{"kind":"arxiv","id":"1610.02656","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.02656","created_at":"2026-05-18T00:45:48Z"},{"alias_kind":"arxiv_version","alias_value":"1610.02656v1","created_at":"2026-05-18T00:45:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.02656","created_at":"2026-05-18T00:45:48Z"},{"alias_kind":"pith_short_12","alias_value":"WJ5Q753PO2TX","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"WJ5Q753PO2TX7LGH","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"WJ5Q753P","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:WJ5Q753PO2TX7LGHA4VKR6GVAT","target":"record","payload":{"canonical_record":{"source":{"id":"1610.02656","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2016-10-09T10:36:28Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"99abac6f26c33b931d1e3ae488847b028892240eb5439c41ebf3d4379bb632ba","abstract_canon_sha256":"90d8ee88f8028b8482b2dbd2a50873d5c28f467c81f4a6f55b546e116a4c0e50"},"schema_version":"1.0"},"canonical_sha256":"b27b0ff76f76a77facc7072aa8f8d504f4b5b0bd65ed2f8c2e4e7194be27a046","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:45:48.102685Z","signature_b64":"VxmEevf5Yfg859b/P2PbJgSJCuYsi7mSU7akejZh8L3bkTXU8HOSiIslNvL1PHymN9l/fpwI/m6ApQ1pVAbnBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b27b0ff76f76a77facc7072aa8f8d504f4b5b0bd65ed2f8c2e4e7194be27a046","last_reissued_at":"2026-05-18T00:45:48.102137Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:45:48.102137Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.02656","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":"2026-05-18T00:45:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QjY5DxNPoLqtZRnWckntb8GQVi21AMArHS37xpp9u62f8cUhzKXsDh3Eox6eA5iz2xUgfGtQAvfwe/Ji9AuAAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T02:49:53.772121Z"},"content_sha256":"56b69586b4855fd9611c1a25f1b438505a8d146c9f0ce64768319ccc7b5ff434","schema_version":"1.0","event_id":"sha256:56b69586b4855fd9611c1a25f1b438505a8d146c9f0ce64768319ccc7b5ff434"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:WJ5Q753PO2TX7LGHA4VKR6GVAT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Iterative reconstruction of SiPM light response functions in a square-shaped compact gamma camera","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"physics.med-ph","authors_text":"A. Morozov, F. Alves, J. Marcos, L. Pereira, R. Martins, V. Chepel, V. Solovov","submitted_at":"2016-10-09T10:36:28Z","abstract_excerpt":"Compact gamma cameras with a square-shaped monolithic scintillator crystal and an array of silicon photomultipliers (SiPMs) are actively being developed for applications in areas such as small animal imaging, cancer diagnostics and radiotracer guided surgery. Statistical methods of position reconstruction, which are potentially superior to the traditional centroid method, require accurate knowledge of the spatial response of each photomultiplier. Using both Monte Carlo simulations and experimental data obtained with a camera prototype, we show that the spatial response of all photomultipliers "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.02656","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":"2026-05-18T00:45:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w7Kgoosrnu0dUI31PVclwuohxsLm99wOJLuA2xCFvViaJPAJ7z243ALVFDR0UrpmKr6gJQYlW0f45/oCRht+BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T02:49:53.772833Z"},"content_sha256":"7cf28004c48dfc3b35a39a2b213fdb07acb147822d9fe40af1f7ddc9cc26d53b","schema_version":"1.0","event_id":"sha256:7cf28004c48dfc3b35a39a2b213fdb07acb147822d9fe40af1f7ddc9cc26d53b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WJ5Q753PO2TX7LGHA4VKR6GVAT/bundle.json","state_url":"https://pith.science/pith/WJ5Q753PO2TX7LGHA4VKR6GVAT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WJ5Q753PO2TX7LGHA4VKR6GVAT/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":"2026-05-26T02:49:53Z","links":{"resolver":"https://pith.science/pith/WJ5Q753PO2TX7LGHA4VKR6GVAT","bundle":"https://pith.science/pith/WJ5Q753PO2TX7LGHA4VKR6GVAT/bundle.json","state":"https://pith.science/pith/WJ5Q753PO2TX7LGHA4VKR6GVAT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WJ5Q753PO2TX7LGHA4VKR6GVAT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:WJ5Q753PO2TX7LGHA4VKR6GVAT","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":"90d8ee88f8028b8482b2dbd2a50873d5c28f467c81f4a6f55b546e116a4c0e50","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2016-10-09T10:36:28Z","title_canon_sha256":"99abac6f26c33b931d1e3ae488847b028892240eb5439c41ebf3d4379bb632ba"},"schema_version":"1.0","source":{"id":"1610.02656","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.02656","created_at":"2026-05-18T00:45:48Z"},{"alias_kind":"arxiv_version","alias_value":"1610.02656v1","created_at":"2026-05-18T00:45:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.02656","created_at":"2026-05-18T00:45:48Z"},{"alias_kind":"pith_short_12","alias_value":"WJ5Q753PO2TX","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"WJ5Q753PO2TX7LGH","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"WJ5Q753P","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:7cf28004c48dfc3b35a39a2b213fdb07acb147822d9fe40af1f7ddc9cc26d53b","target":"graph","created_at":"2026-05-18T00:45:48Z","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":"Compact gamma cameras with a square-shaped monolithic scintillator crystal and an array of silicon photomultipliers (SiPMs) are actively being developed for applications in areas such as small animal imaging, cancer diagnostics and radiotracer guided surgery. Statistical methods of position reconstruction, which are potentially superior to the traditional centroid method, require accurate knowledge of the spatial response of each photomultiplier. Using both Monte Carlo simulations and experimental data obtained with a camera prototype, we show that the spatial response of all photomultipliers ","authors_text":"A. Morozov, F. Alves, J. Marcos, L. Pereira, R. Martins, V. Chepel, V. Solovov","cross_cats":["physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2016-10-09T10:36:28Z","title":"Iterative reconstruction of SiPM light response functions in a square-shaped compact gamma camera"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.02656","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":"sha256:56b69586b4855fd9611c1a25f1b438505a8d146c9f0ce64768319ccc7b5ff434","target":"record","created_at":"2026-05-18T00:45:48Z","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":"90d8ee88f8028b8482b2dbd2a50873d5c28f467c81f4a6f55b546e116a4c0e50","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2016-10-09T10:36:28Z","title_canon_sha256":"99abac6f26c33b931d1e3ae488847b028892240eb5439c41ebf3d4379bb632ba"},"schema_version":"1.0","source":{"id":"1610.02656","kind":"arxiv","version":1}},"canonical_sha256":"b27b0ff76f76a77facc7072aa8f8d504f4b5b0bd65ed2f8c2e4e7194be27a046","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b27b0ff76f76a77facc7072aa8f8d504f4b5b0bd65ed2f8c2e4e7194be27a046","first_computed_at":"2026-05-18T00:45:48.102137Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:45:48.102137Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VxmEevf5Yfg859b/P2PbJgSJCuYsi7mSU7akejZh8L3bkTXU8HOSiIslNvL1PHymN9l/fpwI/m6ApQ1pVAbnBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:45:48.102685Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.02656","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:56b69586b4855fd9611c1a25f1b438505a8d146c9f0ce64768319ccc7b5ff434","sha256:7cf28004c48dfc3b35a39a2b213fdb07acb147822d9fe40af1f7ddc9cc26d53b"],"state_sha256":"f1c777dbbf851f941078658cc6e8d4d284ff7ffe9af3829da93e91388c6e0dd2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AtQNFYEoFFe3whe+dLX8/id3ZrkquLueDNXUqP5FBPAgl3KZ/m4/bsKTViDNe5OmAFZ15wH05vL71G++bimRCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T02:49:53.776944Z","bundle_sha256":"4a464ab8deb2aac6a5bc40146fd927b36557b0d01d8412b793950c583f996bc6"}}