{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:BGQI7LJUKSJOG4BUONKXCFZOIR","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":"4a705a9f476e1662e4ecba17f25bf817782f4030071926b7cb778096e6ad7dea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2009-05-15T11:01:06Z","title_canon_sha256":"c26c171843a09f9f16ca56e9b814d054945ed9516e242888c25c7519cdf3e3f3"},"schema_version":"1.0","source":{"id":"0905.2521","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.2521","created_at":"2026-05-18T04:04:55Z"},{"alias_kind":"arxiv_version","alias_value":"0905.2521v2","created_at":"2026-05-18T04:04:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.2521","created_at":"2026-05-18T04:04:55Z"},{"alias_kind":"pith_short_12","alias_value":"BGQI7LJUKSJO","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BGQI7LJUKSJOG4BU","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BGQI7LJU","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:e7a3e7a8d17ef394ec49ec93be86c3f481b257e466f545c34385cb69228ebed7","target":"graph","created_at":"2026-05-18T04:04:55Z","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":"This work addresses computing techniques for dose calculations in treatment planning with proton and ion beams, based on an efficient kernel-convolution method referred to as grid-dose spreading (GDS) and accurate heterogeneity-correction method referred to as Gaussian beam splitting. The original GDS algorithm suffered from distortion of dose distribution for beams tilted with respect to the dose-grid axes. Use of intermediate grids normal to the beam field has solved the beam-tilting distortion. Interplay of arrangement between beams and grids was found as another intrinsic source of artifac","authors_text":"Nobuyuki Kanematsu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2009-05-15T11:01:06Z","title":"Dose calculation algorithm of fast fine-heterogeneity correction for heavy charged particle radiotherapy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.2521","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:ce065982a648c0164e37a579b79c128e427514d0693bb7182835f75b3a3cde6e","target":"record","created_at":"2026-05-18T04:04:55Z","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":"4a705a9f476e1662e4ecba17f25bf817782f4030071926b7cb778096e6ad7dea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2009-05-15T11:01:06Z","title_canon_sha256":"c26c171843a09f9f16ca56e9b814d054945ed9516e242888c25c7519cdf3e3f3"},"schema_version":"1.0","source":{"id":"0905.2521","kind":"arxiv","version":2}},"canonical_sha256":"09a08fad345492e37034735571172e447d6bcbf37fd3d63ffbb924a2e3228f8c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"09a08fad345492e37034735571172e447d6bcbf37fd3d63ffbb924a2e3228f8c","first_computed_at":"2026-05-18T04:04:55.196552Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:04:55.196552Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LO6x5ZdpmtVXBw/kY7NF8NtowPBktqX7O0gLh25KcOXD9UPWKml9TrDH9H/fLOZNe0z5XWZApTZRwU+ET3XDBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:04:55.197258Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.2521","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce065982a648c0164e37a579b79c128e427514d0693bb7182835f75b3a3cde6e","sha256:e7a3e7a8d17ef394ec49ec93be86c3f481b257e466f545c34385cb69228ebed7"],"state_sha256":"21a55c17c9aefd00b5dd242920cd109c0d8ef0a5b0b466a64e850a43f1d0ec75"}