8.3.3　After Radical Surgery

There are large individual differences in the anatomy of breast cancer patients.For example，the patient is fat and thin.The prescription depth of the supraclavicular area is 3 cm，which is not suitable for all patients.For patients with particularly thin chest wall，the electron line penetrates through the lung tissue deepr.Intensity-modulated radiotherapy technology can make the radiotherapy plan indivi dualized.Figure 8-11 shows the use of the tangential field-based intensity-modulation technology.Develop an overall intensity plan，or try VMAT or TOMO technology.The planning of this situation is very difficult.While ensuring the coverage of the target area and the uniformity of the dose，attention should be paid to reducing the dose of the heart and lung，while paying attention to ensuring the repeatability of the position.

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Fig.8-11 Three-dimensional dose distribution of supracondylar region and chest wall radiotherapy after modified radical mastectomy for breast cancer