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乳腺癌根治术后病人CT图像送入三维治疗计划系统，观察6 MV X线切线照射及电子线垂直照射胸壁时的剂量分布。包括内乳淋巴结和不包括内乳淋巴结的6 MV X线切线照射无需楔形板；单纯电子线垂直照射，即使是6 MeV低能电子线，肺组织受照亦相当严重；6 MeV电子线配合皮肤表面填0．5 cm厚组织等效物，肺组织受照较小，皮肤剂量提高，但内乳淋巴结与其表面皮肤剂量不能两者兼顾；9 MeV电子线配合皮肤表面填不等厚度组织等效物，可使得90％等效剂量包括皮肤、胸壁和内乳淋巴结而肺组织受照很少；对皮肤和内乳淋巴结均需高量照射者，电子线配合皮肤表面填组织等效物垂直照射较X线切线照射有明显优势。
The CT images of patients after radical mastectomy were sent to a three-dimensional treatment planning system to observe the dose distribution of the 6 MV X-ray tangential irradiation and the electron beam perpendicular to the chest wall. 6 MV X-ray tangential irradiation including internal mammary lymph nodes and internal mammary lymph nodes does not require a wedge plate; vertical electron beam irradiation alone, even with 6 MeV low-energy electrons, lung tissue is severely exposed; 6 MeV electronic wire is used to match the skin surface Filling the 0.5 cm thick tissue equivalent, the lung tissue is less exposed and the skin dose is increased, but the inner breast lymph node and its surface skin dose cannot be both; the 9 MeV electron wire is matched with the skin surface to fill in the unequal thickness tissue equivalent It can make 90% equivalent dose including skin, chest wall and internal mammary lymph node while lung tissue is rarely exposed. Both skin and internal mammary lymph nodes require high radiation, and electronic wire and skin surface fill the tissue equivalent vertical irradiation. X-ray tangential irradiation has obvious advantages.