{"paper":{"title":"First Positronium Lifetime Imaging with Scandium-44 on a Long Axial Field-of-view PET/CT","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Anzhelika Moiseeva, Axel Rominger, Ewa {\\L}. St\\k{e}pie\\'n, Hasan Sari, Kuangyu Shi, Lorenzo Mercolli, Maurizio Conti, Narendra Rathod, Nicholas P. van der Meulen, Pascal V. Grundler, Pawe{\\l} Moskal, Robert Seifert, Roger Schibli, Saverio Braccini, William M. Steinberger","submitted_at":"2025-06-16T13:15:35Z","abstract_excerpt":"Purpose: 44Sc has been successfully produced, synthesized, labeled and first-in-human studies were conducted some years ago. The decay properties of 44Sc, together with being close to a clinical implementation, make it an ideal candidate for in vivo positronium lifetime measurements. In this study, we investigate the count statistics for ortho-positronium (oPs) measurements with 44Sc.\n  Method: A NEMA image quality phantom was filled with 41.7 MBq of 44Sc dissolved in water and scanned on a commercial long-axial field-of-view PET/CT. Three-photon events were identified using a prototype featur"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.13460","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/2506.13460/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"}