光子と陽子で治療された患者の換気の変化を,投与量と肺炎の発達に応じて定量化する
Rebecca Lim1,2, Tien Tang2, Austin Castelo2
1Graduate School of Biomedical Sciences, The University of Texas MD Anderson Cancer Center UTHealth Houston, Houston, U.S.A.
medRxiv : the preprint server for health sciences
|August 21, 2025
まとめ
非小細胞肺がんのプロトン治療は,光子治療と比較して,低機能領域の肺の換気変化の改善を示しています. この研究では,放射線治療の機能的イメージングのエンドポイントを調査しています.
科学分野:
- 放射線腫瘍学
- 肺のイメージング
- 医学物理学
背景:
- 陽子療法では,非小細胞肺がんに対する光子療法よりも用量の優位性があります.
- 異なる放射線形態の生物学的効果を評価するための確立された臨床的エンドポイントは欠けている.
- 4次元コンピュータ断層撮影 (4DCT) は,変形可能な画像登録を通じて肺の換気情報を抽出できます.
研究 の 目的:
- 非小細胞肺がんにおける陽子療法と光子療法の間の肺換気変化の違いを調査する.
- 換気の変化と放射線量と放射線誘発性肺炎の発生を相関させる.
- 放射線腫瘍学における機能的エンドポイントとしての換気イメージングの有用性を調査する.
主な方法:
- 換気は20例の光子と20例の陽子療法のジャコビアンベースの方法を使用して4DCTデータから抽出されました.
- 呼吸は,治療期間中,ヴォクセルで追跡され,高機能領域と低機能領域に分類されました.
- 肺機能と肺炎の発達によって層分かれ,換気変化の比較が行われました.
主要な成果:
- 陽子療法を受けた患者は,光子療法を受けた患者と比較して,低機能の肺ボクセル内の換気変化において統計的に有意な改善を示した.
- 分析により,2つの放射線方式の換気ダイナミクスの違いが明らかになった.
- 換気の変化と放射線誘発性肺炎の相関性は調査された.
結論:
- 換気変化によって示されるように,光子療法と比較して,陽子療法は肺機能の保全に利点をもたらす可能性があります.
- 放射線療法の効果を評価するための機能的エンドポイントとして,換気イメージングが有望である.
- 肺炎に罹患した肺部における換気変化に注目する研究が進められます
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