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Convolutional neural networks (CNNs) rely on local pixel intensities, causing systematic confusion between saccular aneurysms and vascular bifurcations - a problem especially acute for small lesions (<3 mm), where detection sensitivity falls below 60%. We propose a plug-and-play, topology-aware false-positive reduction framework evaluating the Smooth Euler Characteristic Transform (SECT) - a directional representation encoding global 3D vascular geometry independently of intensity - against persistence-based summaries (Persistence Images and Landscapes), tested on a stratified subset of the RSNA 2025 dataset. SECT achieves an AUC of 0.943, substantially outperforming direction-agnostic methods (AUC ~0.68), and exhibits a clinical performance inversion: it excels on the sub-3 mm cohort, maintaining 0.9","title":"Shape Over Intensity: Directional Topological Encoding for False Positive Reduction in Intracranial Aneurysm Detection","url":"https://arxiv.org/abs/2607.05317","vendor":"arxiv_cs_ai"},"summary":"arXiv:2607.05317v2 Announce Type: replace-cross \nAbstract: Automated detection of intracranial aneurysms (IAs) from CT angiography (CTA) is severely hindered by high false-positive rates. Convolutional neural networks (CNNs) rely on local pixel intensities, causing systematic confusion between saccular aneurysms and vascular bifurcations - a problem especially acute for small lesions (<3 mm), where detection sensitivity falls below 60%. We propose a plug-and-play, topology-aware false-positive reduction framework evaluating the Smooth Euler Characteristic Transform (SECT) - a directional representation encoding global 3D vascular geometry independently of intensity - against persistence-based summaries (Persistence Images and Landscapes), tested on a stratified subset of the RSNA 2025 dataset. SECT achieves an AUC of 0.943, substantially outperforming direction-agnostic methods (AUC ~0.68), and exhibits a clinical performance inversion: it excels on the sub-3 mm cohort, maintaining 0.9","title":"Shape Over Intensity: Directional Topological Encoding for False Positive Reduction in Intracranial Aneurysm Detection","vendor":"arxiv_cs_ai"},"confidence":{"method":"deterministic"},"decision":"POSITIVE","issued_at":"2026-07-08T04:43:57Z","notes":"Spider vendor_press (news) news.vendor_press.v1","object":{"captured_by":"crovia.spider.vendor_press","primary_source_url":"https://arxiv.org/abs/2607.05317"},"predecessors":[],"schema":"crovia.axiom.v1","signature":"ed25519:01cc631db1f6358777d2b8ec496e001da95e13732b54961cfa8d359c170687802e9994c0ef25a8d94bc06cef102f55def1e6123e9d952134b61a19bdf4bedc05","signer":"crovia.substrate","subject":{"observed_at":"2026-07-08T04:43:57Z","source_collector":"spider:vendor_press","target_id":"https://arxiv.org/abs/2607.05317"},"tsa":{"authority":"crovia.substrate.bootstrap","rfc3161_token":"{\"kind\":\"crovia.bootstrap.tsa\",\"source_jsonl\":\"/opt/crovia/spider/data/news/vendor_press_v1.jsonl\",\"source_seal_merkle_root\":\"spider_vendor_press_v1\",\"upgrade_path\":\"Sessione H \\u2014 OpenTimestamps weekly anchor\"}"},"zk_mode":"clear","zk_proof":null},"ledger":{"leaf_hash":"41e84133119de2d504f9c02b8fc22137f27f6ac5d3ad5450157b06da35da49ba","leaf_index":292886,"ledger_path":"/opt/crovia/substrate/axiom_ledger.jsonl"},"merkle_proof":{"hash_alg":"sha256","leaf_prefix":"0x00","node_prefix":"0x01","odd_leaf_rule":"duplicate_last","path":[{"sibling":"8f72dd0d1284ed2b6cadae0b28d5e5b36ac65d4d4fece202907000378edae1af","side":"right"},{"sibling":"fa8120e0ff837bdc9a4e4d46e2355222aac78a37d88aacbc6480c857fe599828","side":"left"},{"sibling":"f5a63e105ba921ffd9ece0cf66c147b8b456ab1f97dbcde7323dd93a89347135","side":"left"},{"sibling":"67d90a0ebcb8d033b57284387e1f31d0cb1958f2a8541eee8a526aec7bc43f1d","side":"right"},{"sibling":"0579682efbe5934037ec7867f2690378452a425e1de6db2f128294da921e5899","side":"left"},{"sibling":"9ad64c6e4e0b96e008a7023c5b53a49734815b1b1a1b16378dcf9d804f9c413c","side":"right"},{"sibling":"617e77750d7be8d258b9672f3c2eda5e4b605f07228adb8c241e1d828792a13e","side":"right"},{"sibling":"a1c7308f551daa63b64ec77cc13d449bf33e99901d0dda2db2f31bbffc489f6c","side":"right"},{"sibling":"db7425c634a173a48b66583ee32c1bbc8bd9d8222fc9a058769c375b58d4e350","side":"right"},{"sibling":"734e0b99d24020d46ff89b3a21d7fd47637f7587e4afe586fb6fe1f49fb14951","side":"right"},{"sibling":"1174a91ffd715fef4004c103054ba3979b0df671a97b9986f26c644b22f7b68e","side":"right"},{"sibling":"03a737b0f0acc6f32fb2a629212bfae02d124a0d6546cc82e3c7ae458b43fda6","side":"left"},{"sibling":"76855b4804c75c52bf97aa34358950d42d6103cdc1a86be5f0a2c8de4d65c106","side":"left"},{"sibling":"a75ab4319e241beeddb1b3f5705febe0422937926c3479923ccfb0b0082fa4e3","side":"left"},{"sibling":"bd04fa605f883bfb2b81510d045b1e85e555a03da3be083619f61384dfe40ff8","side":"left"},{"sibling":"9e75f2ab0ddf2dc9e92af7049244c21b909734ab57906a35dfad2853ca9966e2","side":"right"},{"sibling":"e6cd4cad39a4b6ca6647d1b0ad2db86e57e5fa6240f65966c10093e91140769b","side":"right"},{"sibling":"90a7efc6b94ec8913fbdf03f4927a821b9fb89921d526716f5ee28f015303779","side":"right"},{"sibling":"1cecb7f447febd025aac272837c80de218aecc6485d2395a509b2a1f1b9c746e","side":"left"}]},"schema":"crovia.axiom_proof.v1","seal":{"first_collector_run_id":"","first_receipt_hash":"","jsonl_path":"/opt/crovia/substrate/axiom_ledger.jsonl","key_id":"430895f101d38164","last_collector_run_id":"","last_receipt_hash":"","leaf_count":292998,"merkle_root":"f533b7efebdfd8fb6ba3e7cc158ee55261fd53a7985f234cfea359170dad4d5a","public_key_hex":"cf742e26f75669dc673cb5c0786a1ae23ae8ca19c347317192ce40c28a7ff25c","run_id":"hourly_json_retrofit_20260708T053701Z","schema":"crovia.seal.v1","seal_family_version":"crovia-seal-family/1","seal_kind":"substrate_batch","sealed_at":"2026-07-08T05:38:17Z","sig_algorithm":"ed25519","signature":"07ebb10c732bbffb28b55a5db01d5525f6b8ab7ef36e1e0a68c35c96ded99f7040c277edba75eb6b15c77feda30bd5321e31ada6f572b674d06f4f8e24bd2f07","signer_version":"1.1.0"},"trust_root":{"key_id":"430895f101d38164","public_key_hex":"cf742e26f75669dc673cb5c0786a1ae23ae8ca19c347317192ce40c28a7ff25c","signature_algorithm":"ed25519","url":"/registry/canon/TRUST_ROOT.md"},"verifier":{"spec":"/registry/canon/AXIOM_RECEIPT_v1.md","url":"/v/axm_c4e52c8ccdac6184846e1dd3b6f03a25dc23c3e96f5caa707c274739fee7dd4b"}}