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This chapter discusses the principles, techniques, and equipment used in relative dosimetry for radiation therapy, summarizing various detector types while emphasizing their roles, limitations, and selection criteria based on field size, beam energy, and scanning requirements. Key applications include the collimator scatter factor (Sc), total scatter factor (St), percent depth dose (PDD), beam profiles, and tissue-phantom ratios (TPR/TMR). The chapter highlights the importance of accurate data acquisition for small fields (<3 × 3 cm2) due to challenges such as the loss of lateral charged particle equilibrium and detector volume averaging. Special considerations are given for advanced machines like MR-LINACs, RefleXion, Halcyon, and Gamma Knife, as each presents unique constraints that require tailored setup and measurement strategies.

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Relative Dosimetry in Radiation Therapy

  • 章节

  • 发表日期：

    2026年

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  • Seng Boh Lim,
  • Sonja Wegener,
  • Raj Mitra,
  • Ching-Ling Teng

摘要

This chapter discusses the principles, techniques, and equipment used in relative dosimetry for radiation therapy, summarizing various detector types while emphasizing their roles, limitations, and selection criteria based on field size, beam energy, and scanning requirements. Key applications include the collimator scatter factor (Sc), total scatter factor (St), percent depth dose (PDD), beam profiles, and tissue-phantom ratios (TPR/TMR). The chapter highlights the importance of accurate data acquisition for small fields (<3 × 3 cm2) due to challenges such as the loss of lateral charged particle equilibrium and detector volume averaging. Special considerations are given for advanced machines like MR-LINACs, RefleXion, Halcyon, and Gamma Knife, as each presents unique constraints that require tailored setup and measurement strategies.