{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:TFHCHD73PJBPBJXPTSBPQOEAKO","short_pith_number":"pith:TFHCHD73","canonical_record":{"source":{"id":"1505.03685","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-05-14T11:19:20Z","cross_cats_sorted":[],"title_canon_sha256":"d8cda19eda3a903b465254b6b950c7c200b725c8cfe33ef93f4e4eef1a65d30f","abstract_canon_sha256":"643ca39b63d647b3a8de1ae8ebb58633eb3422c32722d7bb3856aca7492a0b45"},"schema_version":"1.0"},"canonical_sha256":"994e238ffb7a42f0a6ef9c82f8388053978b7afa751979d314792cca45508d5c","source":{"kind":"arxiv","id":"1505.03685","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.03685","created_at":"2026-05-18T01:20:29Z"},{"alias_kind":"arxiv_version","alias_value":"1505.03685v1","created_at":"2026-05-18T01:20:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.03685","created_at":"2026-05-18T01:20:29Z"},{"alias_kind":"pith_short_12","alias_value":"TFHCHD73PJBP","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_16","alias_value":"TFHCHD73PJBPBJXP","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_8","alias_value":"TFHCHD73","created_at":"2026-05-18T12:29:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:TFHCHD73PJBPBJXPTSBPQOEAKO","target":"record","payload":{"canonical_record":{"source":{"id":"1505.03685","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-05-14T11:19:20Z","cross_cats_sorted":[],"title_canon_sha256":"d8cda19eda3a903b465254b6b950c7c200b725c8cfe33ef93f4e4eef1a65d30f","abstract_canon_sha256":"643ca39b63d647b3a8de1ae8ebb58633eb3422c32722d7bb3856aca7492a0b45"},"schema_version":"1.0"},"canonical_sha256":"994e238ffb7a42f0a6ef9c82f8388053978b7afa751979d314792cca45508d5c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:20:29.568376Z","signature_b64":"kfgE2CkKmKYHgTfQf4QWYWv16NNS/kBr59eJPl/oQPpMbPaVFZIaR86rEtqIApB/GSS+GhXEDihV5kMzxW84Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"994e238ffb7a42f0a6ef9c82f8388053978b7afa751979d314792cca45508d5c","last_reissued_at":"2026-05-18T01:20:29.567867Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:20:29.567867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.03685","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":"2026-05-18T01:20:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WyhBe0boH/ZwG74lJdgjg+8XdpntcB3kvYwGzpL0cIbTcPxk/XeQSgAEf62yevtHWE0C1Dylgtlz6ou47vx5DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T15:16:00.622035Z"},"content_sha256":"0dc5d053424fab03e39cbcb94560acc622361bfa7a816928012b0abd32d26b07","schema_version":"1.0","event_id":"sha256:0dc5d053424fab03e39cbcb94560acc622361bfa7a816928012b0abd32d26b07"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:TFHCHD73PJBPBJXPTSBPQOEAKO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Preliminary Research on Dual-Energy X-Ray Phase-Contrast Imaging","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Can Zhang, Huajie Han, Kai Zhang, Kun Gao, Meng Yang, Peiping Zhu, Shenghao Wang, Zhili Wang","submitted_at":"2015-05-14T11:19:20Z","abstract_excerpt":"Dual-energy X-ray absorptiometry (DEXA) has been widely applied to measure bone mineral density (BMD) and soft-tissue composition of human body. However, the use of DEXA is greatly limited for low-Z materials such as soft tissues due to their weak absorption. While X-ray phase-contrast imaging (XPCI) shows significantly improved contrast in comparison with the conventional standard absorption-based X-ray imaging for soft tissues. In this paper, we propose a novel X-ray phase-contrast method to measure the area density of low-Z materials, including a single-energy method and a dual-energy metho"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.03685","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":"2026-05-18T01:20:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pRlKHh3fUnCZG1HDSXierngIiqL+wVHisLKjX0QDlvG5yvuZ2COFRn6lQod5c9M9QuKSQZCMHrXJ4u2VcJl5AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T15:16:00.622430Z"},"content_sha256":"20a8c7cc5c6de919f4040d97fa7248b32ff76d417d2574c0b8d2f7e38a0f3f6a","schema_version":"1.0","event_id":"sha256:20a8c7cc5c6de919f4040d97fa7248b32ff76d417d2574c0b8d2f7e38a0f3f6a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TFHCHD73PJBPBJXPTSBPQOEAKO/bundle.json","state_url":"https://pith.science/pith/TFHCHD73PJBPBJXPTSBPQOEAKO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TFHCHD73PJBPBJXPTSBPQOEAKO/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":"2026-06-01T15:16:00Z","links":{"resolver":"https://pith.science/pith/TFHCHD73PJBPBJXPTSBPQOEAKO","bundle":"https://pith.science/pith/TFHCHD73PJBPBJXPTSBPQOEAKO/bundle.json","state":"https://pith.science/pith/TFHCHD73PJBPBJXPTSBPQOEAKO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TFHCHD73PJBPBJXPTSBPQOEAKO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:TFHCHD73PJBPBJXPTSBPQOEAKO","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":"643ca39b63d647b3a8de1ae8ebb58633eb3422c32722d7bb3856aca7492a0b45","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-05-14T11:19:20Z","title_canon_sha256":"d8cda19eda3a903b465254b6b950c7c200b725c8cfe33ef93f4e4eef1a65d30f"},"schema_version":"1.0","source":{"id":"1505.03685","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.03685","created_at":"2026-05-18T01:20:29Z"},{"alias_kind":"arxiv_version","alias_value":"1505.03685v1","created_at":"2026-05-18T01:20:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.03685","created_at":"2026-05-18T01:20:29Z"},{"alias_kind":"pith_short_12","alias_value":"TFHCHD73PJBP","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_16","alias_value":"TFHCHD73PJBPBJXP","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_8","alias_value":"TFHCHD73","created_at":"2026-05-18T12:29:42Z"}],"graph_snapshots":[{"event_id":"sha256:20a8c7cc5c6de919f4040d97fa7248b32ff76d417d2574c0b8d2f7e38a0f3f6a","target":"graph","created_at":"2026-05-18T01:20:29Z","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":"Dual-energy X-ray absorptiometry (DEXA) has been widely applied to measure bone mineral density (BMD) and soft-tissue composition of human body. However, the use of DEXA is greatly limited for low-Z materials such as soft tissues due to their weak absorption. While X-ray phase-contrast imaging (XPCI) shows significantly improved contrast in comparison with the conventional standard absorption-based X-ray imaging for soft tissues. In this paper, we propose a novel X-ray phase-contrast method to measure the area density of low-Z materials, including a single-energy method and a dual-energy metho","authors_text":"Can Zhang, Huajie Han, Kai Zhang, Kun Gao, Meng Yang, Peiping Zhu, Shenghao Wang, Zhili Wang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-05-14T11:19:20Z","title":"Preliminary Research on Dual-Energy X-Ray Phase-Contrast Imaging"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.03685","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":"sha256:0dc5d053424fab03e39cbcb94560acc622361bfa7a816928012b0abd32d26b07","target":"record","created_at":"2026-05-18T01:20:29Z","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":"643ca39b63d647b3a8de1ae8ebb58633eb3422c32722d7bb3856aca7492a0b45","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2015-05-14T11:19:20Z","title_canon_sha256":"d8cda19eda3a903b465254b6b950c7c200b725c8cfe33ef93f4e4eef1a65d30f"},"schema_version":"1.0","source":{"id":"1505.03685","kind":"arxiv","version":1}},"canonical_sha256":"994e238ffb7a42f0a6ef9c82f8388053978b7afa751979d314792cca45508d5c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"994e238ffb7a42f0a6ef9c82f8388053978b7afa751979d314792cca45508d5c","first_computed_at":"2026-05-18T01:20:29.567867Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:20:29.567867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kfgE2CkKmKYHgTfQf4QWYWv16NNS/kBr59eJPl/oQPpMbPaVFZIaR86rEtqIApB/GSS+GhXEDihV5kMzxW84Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:20:29.568376Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.03685","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0dc5d053424fab03e39cbcb94560acc622361bfa7a816928012b0abd32d26b07","sha256:20a8c7cc5c6de919f4040d97fa7248b32ff76d417d2574c0b8d2f7e38a0f3f6a"],"state_sha256":"00ee0d6e26cf5b57ae5795282e045a3c7e4818a17c01840cc05612a912459b1f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2TQ9aJ4s7llv/yhzXlFNo2hdkCOzxbP4Qyf9OsVdQoRdHW9zLBIJ5E9Y7F/lkBFuGraH2qzDdKneMwRBx0yiDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T15:16:00.624549Z","bundle_sha256":"731b16e6c875a12209f3060f8a708a65642291c67b4f82f1e38f26c1a706489a"}}