Current WHO estimates suggest that the vaccine storage requirements would at least double if only single-dose presentations were used (WHO vaccine volume calculator, March 2011).
All plans were compared according to the planning target volume coverage, dose-volume histogram and other dosimetric parameters of normal tissues.
根据计划靶区的等剂量分布、体积-剂量直方图以及其他的剂量学指标，比较两种不同治疗计划的优劣。
3
Conclusions: the beam Angle and the number of beams have influence upon dose distribution, the dose distribution would be improved for large volume target with the increment of beam number.