{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:HN7QO2AZ7NZLQVAZ4HJ7HJRC2R","short_pith_number":"pith:HN7QO2AZ","canonical_record":{"source":{"id":"1912.01058","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-12-02T19:45:35Z","cross_cats_sorted":["eess.IV"],"title_canon_sha256":"f6a65e54f3b13e11fa188c2812b76e135f58e74d87b359f78064c5d9bebd0492","abstract_canon_sha256":"84cd242fe200a4d87f4c5b6f24ca5336374e02c57688ed750372ba307252882d"},"schema_version":"1.0"},"canonical_sha256":"3b7f076819fb72b85419e1d3f3a622d457c29e10cd63e7c63af36c182816e73c","source":{"kind":"arxiv","id":"1912.01058","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.01058","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"arxiv_version","alias_value":"1912.01058v2","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.01058","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"pith_short_12","alias_value":"HN7QO2AZ7NZL","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"pith_short_16","alias_value":"HN7QO2AZ7NZLQVAZ","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"pith_short_8","alias_value":"HN7QO2AZ","created_at":"2026-07-05T01:29:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:HN7QO2AZ7NZLQVAZ4HJ7HJRC2R","target":"record","payload":{"canonical_record":{"source":{"id":"1912.01058","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-12-02T19:45:35Z","cross_cats_sorted":["eess.IV"],"title_canon_sha256":"f6a65e54f3b13e11fa188c2812b76e135f58e74d87b359f78064c5d9bebd0492","abstract_canon_sha256":"84cd242fe200a4d87f4c5b6f24ca5336374e02c57688ed750372ba307252882d"},"schema_version":"1.0"},"canonical_sha256":"3b7f076819fb72b85419e1d3f3a622d457c29e10cd63e7c63af36c182816e73c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:29:45.073540Z","signature_b64":"UG7ye2yfsfi0xCsCi6ZFAHYZTqurz+QZDttH5e5jaSTdDwJ0sDIjjM7vITUv4itWVa2S2ShzU1Ob/4cJL6t8Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3b7f076819fb72b85419e1d3f3a622d457c29e10cd63e7c63af36c182816e73c","last_reissued_at":"2026-07-05T01:29:45.073022Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:29:45.073022Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1912.01058","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T01:29:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KSitmmg51oXixGa0ptk6xGYBhyyDpHLOOsfPemRPBCLcjvUTmw/PmvyeUKbQWpGHlKSAS3EVu/XpdBPjAtOQBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-22T04:05:05.848680Z"},"content_sha256":"3e90f8747ed9c40da0ab64c4bd22327bca058b711a4c46d9a45179f98dff50cc","schema_version":"1.0","event_id":"sha256:3e90f8747ed9c40da0ab64c4bd22327bca058b711a4c46d9a45179f98dff50cc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:HN7QO2AZ7NZLQVAZ4HJ7HJRC2R","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nonnegative Gaussian process tomography for generalized segmented planar detectors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.IV"],"primary_cat":"physics.ins-det","authors_text":"D. Blyth, E. Galyaev, J. Holmes, N. Mullins","submitted_at":"2019-12-02T19:45:35Z","abstract_excerpt":"The concept of Gaussian process tomography along with nonnegative constraints is applied in the context of high-resolution image reconstruction using segmented planar detectors with few readout channels.Expanding on the concept of 2-D projections onto strip-like readout segmentations, 3-D projections as well as more generalized detector segmentation and readout channel mappings are explored. A focus is placed on reconstructing dose distributions in proton therapy pencil beam scanning, and a fast, approximate approach to applying nonnegative constraints is developed and motivated for use in pro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.01058","kind":"arxiv","version":2},"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/1912.01058/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":"2026-07-05T01:29:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nVA3TdkO/tRcX/a0vanG0nzZtmfclcRXqiTh8KE1jqQMxZQDVe6ZCHULz2xqk4jdMoJceLWbkzP2A0oz21GSBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-22T04:05:05.849047Z"},"content_sha256":"259948f8dfe6cafd6fb18b6a7524a87d7ed5d090b7fb9796cc284ce0efd5c67c","schema_version":"1.0","event_id":"sha256:259948f8dfe6cafd6fb18b6a7524a87d7ed5d090b7fb9796cc284ce0efd5c67c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HN7QO2AZ7NZLQVAZ4HJ7HJRC2R/bundle.json","state_url":"https://pith.science/pith/HN7QO2AZ7NZLQVAZ4HJ7HJRC2R/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HN7QO2AZ7NZLQVAZ4HJ7HJRC2R/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":"2026-07-22T04:05:05Z","links":{"resolver":"https://pith.science/pith/HN7QO2AZ7NZLQVAZ4HJ7HJRC2R","bundle":"https://pith.science/pith/HN7QO2AZ7NZLQVAZ4HJ7HJRC2R/bundle.json","state":"https://pith.science/pith/HN7QO2AZ7NZLQVAZ4HJ7HJRC2R/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HN7QO2AZ7NZLQVAZ4HJ7HJRC2R/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:HN7QO2AZ7NZLQVAZ4HJ7HJRC2R","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":"84cd242fe200a4d87f4c5b6f24ca5336374e02c57688ed750372ba307252882d","cross_cats_sorted":["eess.IV"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-12-02T19:45:35Z","title_canon_sha256":"f6a65e54f3b13e11fa188c2812b76e135f58e74d87b359f78064c5d9bebd0492"},"schema_version":"1.0","source":{"id":"1912.01058","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.01058","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"arxiv_version","alias_value":"1912.01058v2","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.01058","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"pith_short_12","alias_value":"HN7QO2AZ7NZL","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"pith_short_16","alias_value":"HN7QO2AZ7NZLQVAZ","created_at":"2026-07-05T01:29:45Z"},{"alias_kind":"pith_short_8","alias_value":"HN7QO2AZ","created_at":"2026-07-05T01:29:45Z"}],"graph_snapshots":[{"event_id":"sha256:259948f8dfe6cafd6fb18b6a7524a87d7ed5d090b7fb9796cc284ce0efd5c67c","target":"graph","created_at":"2026-07-05T01:29:45Z","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/1912.01058/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The concept of Gaussian process tomography along with nonnegative constraints is applied in the context of high-resolution image reconstruction using segmented planar detectors with few readout channels.Expanding on the concept of 2-D projections onto strip-like readout segmentations, 3-D projections as well as more generalized detector segmentation and readout channel mappings are explored. A focus is placed on reconstructing dose distributions in proton therapy pencil beam scanning, and a fast, approximate approach to applying nonnegative constraints is developed and motivated for use in pro","authors_text":"D. Blyth, E. Galyaev, J. Holmes, N. Mullins","cross_cats":["eess.IV"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-12-02T19:45:35Z","title":"Nonnegative Gaussian process tomography for generalized segmented planar detectors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.01058","kind":"arxiv","version":2},"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":"sha256:3e90f8747ed9c40da0ab64c4bd22327bca058b711a4c46d9a45179f98dff50cc","target":"record","created_at":"2026-07-05T01:29:45Z","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":"84cd242fe200a4d87f4c5b6f24ca5336374e02c57688ed750372ba307252882d","cross_cats_sorted":["eess.IV"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-12-02T19:45:35Z","title_canon_sha256":"f6a65e54f3b13e11fa188c2812b76e135f58e74d87b359f78064c5d9bebd0492"},"schema_version":"1.0","source":{"id":"1912.01058","kind":"arxiv","version":2}},"canonical_sha256":"3b7f076819fb72b85419e1d3f3a622d457c29e10cd63e7c63af36c182816e73c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3b7f076819fb72b85419e1d3f3a622d457c29e10cd63e7c63af36c182816e73c","first_computed_at":"2026-07-05T01:29:45.073022Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:29:45.073022Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UG7ye2yfsfi0xCsCi6ZFAHYZTqurz+QZDttH5e5jaSTdDwJ0sDIjjM7vITUv4itWVa2S2ShzU1Ob/4cJL6t8Bg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:29:45.073540Z","signed_message":"canonical_sha256_bytes"},"source_id":"1912.01058","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3e90f8747ed9c40da0ab64c4bd22327bca058b711a4c46d9a45179f98dff50cc","sha256:259948f8dfe6cafd6fb18b6a7524a87d7ed5d090b7fb9796cc284ce0efd5c67c"],"state_sha256":"880ce1c811e0f86ff84ed5d41e1d57b398a88e763adbe0fc2e610de6ac60c718"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nKbUZKuGgaAklBwxtGr6LH1b49yRIVnTsdxsKTalKeFciESIknttSaRJaE5a8Pmerftb2zJsIgvd3LHjTM/mCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-22T04:05:05.851192Z","bundle_sha256":"4f1f0f5f1580a88ea510eb366c20952e97b4a3c80d8aad26ceb867048f79de1f"}}