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肺がんに対する放射線療法後の呼吸機能変化の4次元CT検査
Shiho Wada1, Tomohiro Itonaga1, Ryuji Mikami1
1Department of Radiology, Tokyo Medical University Hospital, Tokyo, JPN.
Cureus
|February 23, 2026
まとめ
この症例報告は、放射線療法が永続的な肺機能の変化を引き起こす可能性があることを示しています。4次元CT(4DCT)は、肺がん治療後の線量に関連する換気低下を明らかにしました。
科学分野:
- 肺イメージング; 放射線腫瘍学; 医用物理学
背景:
- 放射線療法(RT)は肺がん治療に不可欠ですが、地域的肺機能への長期的な影響は完全には理解されていません。 治療後の肺の変化を評価することは、患者管理と肺保護戦略にとって不可欠です。
研究 の 目的:
- 肺がん放射線療法後の地域的肺機能の経時的変化と放射線線量との関連を調査すること。 変形画像レジストレーション(DIR)ベースの4次元CT(4DCT)換気イメージングの有用性を単一患者の症例で評価すること。
主な方法:
- IIIA期の肺がん患者1例が化学放射線療法を受けました。 変形画像レジストレーション(DIR)ベースの4DCT換気イメージングをRT前、RT後6ヶ月、RT後1年で実施しました。 分析は、照射された肺領域と照射されていない肺領域の容積および機能的変化に焦点を当てました。
主要な成果:
- 照射された右肺上葉の容積は減少し、時間とともに収縮率が増加しました。 照射されていない左肺下葉の容積は、RT後1年で11%増加し、収縮率はわずかに減少しました。 4DCT由来の換気は、RT後1年で、低線量領域でさえも、持続的で線量に関連する低下を示しました。
結論:
- この症例は、機能的イメージングと解剖学的CTを統合することが、RT後のフォローアップと肺保護に役立つ可能性を示唆しています。 所見は、肺がん放射線療法後の線量に関連する長期的な換気障害の可能性を強調しています。 限界としては、単一患者のデザイン、DIRへの依存性、および肺機能検査の欠如が挙げられます。
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