乳癌・術後照射の実践的テクニック（2）

The practical techniques for the postoperative radiotherapy in breast cancer（2）

前稿では，乳癌術後照射の治療計画の基礎となる臨床的標的体積（CTV）のコンツーリングおよび標的内線量の適合基準やリスク臓器の線量制約について述べた^1）。今回は標準的な照射手技について概説する。

In the previous article, compliance criteria and normal tissue constraints by NSABP B-51 were introduced following the discussion about contouring procedures. This article explains some standard approaches in the clinical practice of breast radiotherapy, including techniques for reducing inhomogeneity in the target volume and dose to normal tissue.