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作者从1975年起对165例直肠癌患者行术后放疗,全部患者均行根治性手术。放疗用4野盒式技术,某些患者用左右侧野和后野的3野技术。大多数患者用10MV X线,病人俯卧位。腹会阴切除术者全部会阴瘢痕包括在照射野内。低位前切除者,照射野下界在吻合口下缘下4～5cm。上～一般在L_5的中线。侧野的范围是真骨盆侧面1部1.5cm。需治疗盆部瘢痕时,侧野的后界包括全界骶骨,在骶骨后0.5～1cm。前野必需包括原发瘤床和肿瘤可能侵犯的组织。女性阴道后壁,男性前列腺的大部分,都包括在照射野内。剂量一般给45Gy,之后用侧野或缩野只包括高危险的病灶残余范围,加量540cGy。只有确实知道小肠已经移到照射野外面,才能再加量,否则只照射5040cGy。全组患者平均65岁,3例B_1期,53例B_2期,7例
From 1975, the authors performed postoperative radiotherapy for 165 patients with rectal cancer. All patients underwent radical surgery. Radiotherapy uses 4-field cassette technology, and some patients use the 3-field technology of the left and right side fields and the rear field. Most patients use 10 MV X-rays and the patient is in a prone position. All perineal scars in abdominoperineal resection were included in the field. In the lower resection, the lower boundary of the irradiation field is 4 to 5 cm below the lower edge of the anastomosis. Upper ~ Normally at the midline of L_5. The range of the lateral field is 1.5 cm on the side of the true pelvis. In the treatment of pelvic scars, the posterior boundary of the lateral field includes the entire patella, 0.5 to 1 cm posterior to the sacrum. The ex-field must include the primary tumor bed and the tissue that the tumor may invade. The back wall of the female vagina, most of the male prostate gland, is included in the field. The dose is generally given to 45 Gy. Later, the side field or shrinkage field is used to include only the high-risk lesion residual range, and the amount is 540 cGy. Only when it is known that the small intestine has moved out of the irradiation field can it be re-adjusted, otherwise only 5040 cGy will be irradiated. The average patient group was 65 years old, 3 cases were B1, 53 cases were B2, and 7 cases.