粒子線治療計画のためのCT値―阻止能比変換の校正方法の更新

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  • 兼松 伸幸
    量子科学技術研究開発機構放射線医学総合研究所病院医学物理室
  • 森 慎一郎
    量子科学技術研究開発機構放射線医学総合研究所加速器工学部
  • 稲庭 拓
    量子科学技術研究開発機構放射線医学総合研究所加速器工学部

書誌事項

タイトル別名
  • Revision of Calibration Method of CT-Number to Stopping-Power-Ratio Conversion for Treatment Planning of Particle Therapy
  • リュウシセン チリョウ ケイカク ノ タメ ノ CTチ : ソシノウヒ ヘンカン ノ コウセイ ホウホウ ノ コウシン

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説明

<p>A calibration method for CT-number to stopping-power-ratio conversion was recently proposed as a revision of the Japanese de facto standard method that has been used at particle therapy centers in Japan for over a decade. The revised method deals with 11 representative tissues of specific elemental composition and density, based on a latest compilation of standard tissue data. We report here how the revision was actually implemented into clinical practice. We applied the revised method to 7 CT-scanning conditions currently in use for treatment planning. For each condition, we derived CT numbers and stopping-power ratios of the representative tissues to constitute a polyline conversion function. We analyzed the change of target water-equivalent depth by the revision for 38 beams in treatment plans for 13 randomly sampled patients. The revision caused a mean change of +0.3 mm with a standard deviation of 0.4 mm. The maximum change was +1.2 mm or +0.5% of the depth, which may be clinically insignificant. The transition to the revised method was straightforward and would slightly improve the accuracy of the beam range in particle therapy.</p>

収録刊行物

  • 医学物理

    医学物理 37 (1), 34-37, 2017

    公益社団法人　 日本医学物理学会

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