回転型強度変調法を用いた肺定位放射線治療中における標的の軌跡解析 Motion Analysis of Target during Stereotactic Radiotherapy of Lung Tumors Using Volumetric Modulated Arc Therapy

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Volumetric modulated arc therapy (VMAT) is a rotational intensity-modulated radiotherapy (IMRT)technique capable of acquiring projection images for cone-beam computed tomography (CBCT). Respiratorycorrelatedcone-beam computed tomography, namely 4D-CBCT, serves to assess the displacement of a tumorposition between planning and treatment due to organ motion and respiration, and is important for more accurateradiation therapy. On the other hand, recently, a 320-detector row CT scanner, namely 4D-CT, hasbecome available that allows axial volumetric scanning of a 16-cm-long range in a patient without tablemovement. The goal of our research is to establish a new method of verification during treatment in stereotacticbody radiotherapy. In this study, we compare the movement of the tumor between "before treatment" using4D-CT and "in treatment" using 4D-CBCT. Three patients (55–68 years of age) with lung tumors underwentCT scans for radiotherapy planning using 4D-CT scans to analyze the movement of the tumor before treatment.The patients were treated by VMAT while acquiring projection images. 4D-CBCT datasets were reconstructedfrom the projection images using in-house programs. The tumor positions in 4D-CT and 4D-CBCTwere detected and the movement of the tumor between "before treatment" and "in treatment" was similar. Themovement of the tumors during treatment was predictable from 4D-CT before treatment. Furthermore,4D-CBCT clarified the tumor position during treatment and could reevaluate the actual tumor position anddose distribution. We have successfully shown the movement of the tumor between "before treatment" using4D-CT and "in treatment" using 4D-CBCT.

Volumetric modulated arc therapy (VMAT) is a rotational intensity-modulated radiotherapy (IMRT) technique capable of acquiring projection images for cone-beam computed tomography (CBCT). Respiratory-correlated cone-beam computed tomography, namely 4D-CBCT, serves to assess the displacement of a tumor position between planning and treatment due to organ motion and respiration, and is important for more accurate radiation therapy. On the other hand, recently, a 320-detector row CT scanner, namely 4D-CT, has become available that allows axial volumetric scanning of a 16-cm-long range in a patient without table movement. The goal of our research is to establish a new method of verification during treatment in stereotactic body radiotherapy. In this study, we compare the movement of the tumor between "before treatment" using 4D-CT and "in treatment" using 4D-CBCT. Three patients (55–68 years of age) with lung tumors underwent CT scans for radiotherapy planning using 4D-CT scans to analyze the movement of the tumor before treatment. The patients were treated by VMAT while acquiring projection images. 4D-CBCT datasets were reconstructed from the projection images using in-house programs. The tumor positions in 4D-CT and 4D-CBCT were detected and the movement of the tumor between "before treatment" and "in treatment" was similar. The movement of the tumors during treatment was predictable from 4D-CT before treatment. Furthermore, 4D-CBCT clarified the tumor position during treatment and could reevaluate the actual tumor position and dose distribution. We have successfully shown the movement of the tumor between "before treatment" using 4D-CT and "in treatment" using 4D-CBCT.

収録刊行物

  • 日本放射線技術學會雜誌

    日本放射線技術學會雜誌 68(2), 153-161, 2012-02-20

    日本放射線技術学会

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各種コード

  • NII論文ID(NAID)
    10030139142
  • NII書誌ID(NCID)
    AN00197784
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03694305
  • NDL 記事登録ID
    023594067
  • NDL 請求記号
    Z19-205
  • データ提供元
    CJP書誌  CJP引用  NDL  IR  J-STAGE 
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