{
  "abstract": "Introduction\n\nPrevious computed tomography (CT) energy-saving studies have primarily focused on after-hours shutdown or idle energy use in diagnostic CT. Radiotherapy simulation, however, includes preparation and immobilisation steps that may prolong daytime non-acquisition periods. This study quantified daytime energy use in radiotherapy simulation CT and evaluated the contribution of power-saving operation.Methods\n\nIn this prospective single-centre study, electrical power consumption was directly measured using a three-phase power logger during five baseline and five power-saving weekdays (08:00-18:00). Power measurements were integrated with patient in-room intervals and simulation procedure categories. Staff perceptions of workflow impact were assessed using an anonymous questionnaire, and carbon implications were estimated from the measured energy reduction.Results\n\nMean directly measured clinical-hour energy consumption decreased from 38.7 to 36.5 kWh/day with power-saving operation, a 5.8% reduction. Non-acquisition time during patient presence varied markedly by procedure, from 56.5% for respiratory-gated four-dimensional CT to 97.1% for head-and-neck simulation. Power-saving operation shifted daytime power use towards a lower-power state, corresponding to an estimated reduction of 0.84-1.01 kg-CO₂ per clinical day across the emission-factor sensitivity range. Twenty of 21 staff (95.2%) reported no impact on patient throughput.Conclusion\n\nPower-saving operation reduced daytime energy consumption without meaningful workflow disruption. Radiotherapy simulation CT has prolonged, procedure-dependent idle periods arising from radiotherapy-specific preparation workflows, highlighting a practical and previously undercharacterised opportunity for energy reduction.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Radiological Technology, National Cancer Center Hospital East, Kashiwa, Chiba, Japan.",
    "Department of Radiology, Saiseikai Niigata Kenoh Kikan Hospital, Niigata, Japan."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Kouta Hirotaki",
      "orcid": "0000-0002-9239-3395"
    },
    {
      "affs": [
        1
      ],
      "name": "Yoshiaki Honda"
    },
    {
      "affs": [
        0
      ],
      "name": "Masashi Ito"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/aqwsgdxjbxejg.bib",
  "cited_by": 0,
  "doi": "10.1002/jmrs.70133",
  "fulltext_url": "https://europepmc.org/articles/PMC13725422",
  "id": "aqwsgdxjbxejg",
  "issns": [
    "2051-3895",
    "2051-3909"
  ],
  "landing_url": "https://europepmc.org/article/MED/42969022",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "Original Article"
    ],
    [
      "openalex",
      "2105|Energy Efficiency and Management"
    ]
  ],
  "openalex": "W7225104276",
  "pdf_url": "https://europepmc.org/articles/PMC13725422?pdf=render",
  "pmcid": "PMC13725422",
  "pmid": "42969022",
  "published": "2026-11-02",
  "publisher": "Wiley",
  "ris": "https://research.draconitic.com/paper/aqwsgdxjbxejg.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T15:20:53Z",
      "native_id": "MED:42969022",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42969022"
    },
    {
      "first_seen": "2026-11-04T12:23:49Z",
      "native_id": "PMC13725422",
      "source": "pmc",
      "url": "https://doi.org/10.1002/jmrs.70133"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "journal-openalex:F27",
      "subfield": "general"
    }
  ],
  "title": "Daytime Idle Energy Reduction in Radiotherapy Simulation Computed Tomography: A Prospective Workflow-Based Evaluation.",
  "title_text": "Daytime Idle Energy Reduction in Radiotherapy Simulation Computed Tomography: A Prospective Workflow-Based Evaluation.",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T12:21:41Z",
  "url": "https://research.draconitic.com/paper/aqwsgdxjbxejg",
  "venue": "Journal of medical radiation sciences",
  "versions": []
}