Conclusion: We have demonstrated that the γ3%/3mm can be quantitatively estimated from the characteristics of respiratory motion. From the results of multi-regression analysis, reducing the amplitude of respiratory motion would provide high γ3%/3mm. Purpose or Objective: The field-in-field (FIF) technique has become a widely performed method of administering tangential whole breast radiotherapy. However, as the FIF technique requires the precise setting of the position of the multi-leaf

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... ors (MLCs) in order to reduce hot spots, there is concern that its use could significantly change the dose distribution to the target volume due to respiratory