The cases were divided into three groups according to resection scope, radiation range and radiation dose of Posterior Fossa. Each group was analysed with 1, 3, 5 year survival rates and prognostic.
所有病例根据手术切除范围、术后照射范围大小以及后颅凹照射剂量的不同，分三组进行1、3、5年生存率及预后因素的分析。
Results the large dose divided radiotherapy may improve the patient's survival quality, shorten the patient's treatment time, does not increase the patient's adverse reactions of radiotherapy.
结果大剂量分割可提高患者的生存质量，缩短患者的治疗时间，不增加患者的放射反应。
Methods The healthy volunteers were divided into 6 different dose groups randomly for the clinical trial including 4 single dose groups and 2 multiple dose groups.
方法采用随机分组的观察方法，共分6个剂量组，即单次和累积给药剂量组，其中单次给药剂量组4个，累积给药剂量组2个。
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