{
  "abstract": "In Positron Emission Tomography, a potential, yet unutilized enhancement, may come from exploiting the quantum entanglement of the annihilation quanta, inscribed in the correlation of their polarizations. To investigate this, we built a PET demonstrator capable of measuring polarization correlations of annihilation quanta by their Compton scattering, based on single-layer scintillator polarimeters. We present a detailed study of the imaging of two $^{68}$Ge line sources, 45 MBq each, to extract the spatial resolution and assess image quality. The results show that a spatial resolution of 2.5$\\pm$0.1 mm is obtained using single-pixel events, while resolutions obtained with polarization-correlated Compton events range from 3.6$\\pm$0.3 mm to 4.9$\\pm$0.3 mm, depending on data selection criteria. We also found that the polarization-correlated Compton events exhibit up to 20% higher average signal to random background ratio compared to the single-pixel events. We also present the first imaging of the NEMA NU-4 phantom filled with a $^{68}$Ga solution of 378 MBq initial activity, successfully combining polarization-correlated events with conventional single-pixel event selection. Based on the extracted spatial resolution, signal-to-background, signal-to-noise, contrast, and contrast-to-noise ratio, we estimate that up to 10% sensitivity increase may be attained by exploiting the polarization-correlated events, while preserving a high image quality.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.25804",
  "author_total": 7,
  "authors": [
    {
      "name": "Mihael Makek"
    },
    {
      "name": "Ana Marija Kožuljević"
    },
    {
      "name": "Tomislav Bokulić"
    },
    {
      "name": "Darko Grošev"
    },
    {
      "name": "Zdenka Kuncic"
    },
    {
      "name": "Siddharth Parashari"
    },
    {
      "name": "Luka Pavelić"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2shanr38hvj6q.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.25804",
  "fulltext_url": null,
  "id": "2shanr38hvj6q",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.25804",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.ins-det"
    ],
    [
      "arxiv",
      "physics.med-ph"
    ],
    [
      "openalex",
      "2741|Medical Imaging Techniques and Applications"
    ]
  ],
  "openalex": "W7165963348",
  "pdf_url": "https://arxiv.org/pdf/2606.25804",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2shanr38hvj6q.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:24Z",
      "native_id": "2606.25804",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.25804"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.med-ph",
      "subfield": "biological-medical"
    }
  ],
  "title": "Positron Emission Tomography with quantum-entangled Compton events: first imaging results at clinically relevant activities",
  "title_text": "Positron Emission Tomography with quantum-entangled Compton events: first imaging results at clinically relevant activities",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:01Z",
  "url": "https://research.draconitic.com/paper/2shanr38hvj6q",
  "venue": "arXiv",
  "versions": []
}