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发生率因盆腔癌接受放疗者中,位于盆腔肿瘤附近的小肠肠攀(主要是回肠)粘膜发生改变者约占80％,几乎100％的直肠发生了组织学改变。大多数患者放疗后症状轻微,但是,约2.5％～15％的患者却有显著的结直肠症状,一些因放射所致的肠损伤最后需要手术。电离辐射对组织的影响除X线的绝对量外,更重要的是剂量/频率关系,即一次给予的X线剂量和整个剂量给予的速率。剂量越大及总剂量的分配给予越快,对细胞的损伤越重;反之则较轻。细胞损
The incidence of pelvic cancer in patients receiving radiotherapy, located in the pelvic tumor near the small intestine intestinal Pan (mainly the ileum) mucosal changes accounted for about 80%, almost 100% of the rectal histological changes. Most patients have mild symptoms after radiotherapy. However, about 2.5% to 15% of patients have significant colorectal symptoms. Some bowel injuries due to radiation eventually require surgery. Effect of Ionizing Radiation on Tissue In addition to the absolute amount of X-rays, it is more important that the dose / frequency relationship be the dose of X-ray given once and the rate given throughout the dose. The greater the dose and the greater the total dose given, the heavier the damage to the cell is; and vice versa. Cell damage