写真フィルムによるナロー・ビームの線量評価 Evaluation of film dosimetry for narrow photon beams using linear accelerator

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抄録

Narrow photon beam dosimetry used in stereotactic radiosurgery can be made difficult because of the presence of lateral electoronic disequilibrium and steep dose gradiants. Dosimetric characteristics of 10MV circular narrow photon beams ranging in size from 11.6 to 31.4 mm are reported. These characteristics include the measurement of tissue maximum ratio, off axis ratio and relative output factors. Measurements of these parameters were performed in a solid water phantom using x-ray films and cylindrical micro ionization chamber. Although in 50% isodose level width the measurement by micro ionization chamber and x-ray film correlated well, in 80% isodose level width measurement by micro chamber showed apparent underevaluation than that by x-ray film. The relative output factors measurement by micro ionization chamber was consistent with that by x-ray film within 3 % for the field size between 11.6 and 31.4 mm φ.

収録刊行物

  • 放射線医学物理

    放射線医学物理 17(1), 9-15, 1997-03

    Japan Society of Medical Physics

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各種コード

  • NII論文ID(NAID)
    10003723851
  • NII書誌ID(NCID)
    AA11137895
  • 本文言語コード
    JPN
  • 資料種別
    OTR
  • ISSN
    09188010
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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