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目的探讨ＣＴ扫描在乳腺癌根治术后放疗计划设计中的作用。方法在１５例乳腺癌根治术后ＣＴ片上测量：①第２～５肋间健侧与患侧内乳淋巴链的深度和第１肋间健侧与患侧内乳淋巴链的深度；②患侧胸壁的厚度；③椎管中线与胸骨中线的偏差。结果①第２～５肋间健侧与患侧内乳淋巴链的深度分别为（２．９１９±０．４７９）ｃｍ和（１．９５４±０．６０３）ｃｍ；第１肋间健侧与患侧内乳淋巴链的深度分别为（３．５４７±０．４８８）ｃｍ和（３．２９２±０．３４４）ｃｍ；②患侧胸壁厚度为（１．３８０±０．４５９）ｃｍ；③椎管中线与胸骨中线的偏差为（０．６３８±０．２９３）ｃｍ。结论乳腺癌根治术后放疗前ＣＴ扫描能使放射野的设计更为精确，能量的选择更加合理
Objective To investigate the role of CT scanning in radiotherapy planning after radical mastectomy for breast cancer. Methods Fifteen cases of post-radical mastectomy for breast cancer were examined by CT scan: ① The depth of the internal mammary lymph nodes and the depth of the first intercostal contralateral papilla and the ipsilateral mammary gland lymphatic chain in the intercostal and intercostal spaces between the second and the fifth; The thickness of the side chest wall; ③ deviation of the midline of the spinal canal and the midline of the sternum. Results (1) The depth of the mammary gland lymphatic chain between the 2nd and 5th intercostal space were (2.919 ± 0.479) cm and (1.954 ± 0.603) cm, respectively. The first intercostal contralateral and The depth of the ipsilateral internal mammary lymph nodes were (3.547 ± 0.488) cm and (3.292 ± 0.344) cm, respectively; ② The thickness of the ipsilateral chest wall was (1.380 ± 0.459) cm; ③ The deviation between the midline of midline and midline of sternum was (0.638 ± 0.293) cm. Conclusions CT scan before radiotherapy for radical mastectomy can make the design of radiation field more accurate and the choice of energy is more reasonable