Applicability of Area/Perimeter Method for Determining Tissue-Air Ratios to Irregular Fields Defined by Multi-Split Collimator for Conformation Therapy

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Other Title
  • 面積/周囲長によるTAR計算法の多分割原体コリメータを用いた不整形照射野への適用

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Description

Central axis tissue-air ratios (TAR) for 4 MV x rays of a large number of square, rectangular and irregular fields defined by a multi-split collimator for conformation therapy were obtained experimentally up to a depth of 25 cm. Families of TAR curves as a function of area at depth, divided by perimeter (A/P) for fixed values of depth were plotted first using the data for square fields. These were then compared with data for irregular fields. When the equivalent perimeter of the field Pe was used, rather than the real perimeter P, the A/P method for determining TAR was found to be applicable within a 2% error up to a 15 cm depth for uneven fields shaped with the multi-split collimator.

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Details 詳細情報について

  • CRID
    1390282679648462976
  • NII Article ID
    130001928830
  • DOI
    10.11323/jjmp1981.1.1_11
  • ISSN
    21869847
    02885506
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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