医生在进行放疗之前，必须进行模拟和计算，以确认病人接收放疗的姿势，辐射量(radiation dose)，以及保护块(shielding block)的形状和位置，以便让放疗达到最好的效果。这些计算和模拟都相当的复杂，细微到要考虑到皮肤的反射。
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radiation shielding concrete block 防护辐射混凝土块
shielding temporary block 屏蔽暂堵
block shielding 铅挡块遮挡
lead block shielding 铅块遮挡
concrete block for shielding 防射线混凝土砌块
The sleeve has a dome-shaped shielding portion at one end, and a flange portion to be fixed to a modulator block at the other end.
该套有一个圆顶形屏蔽一端的部分，以及法兰一部分固定在另一端调制块。
Conclusions:( 1) Using the design method of block shielding faciocervical portals at isocentre, the individual portals can be designed according to the malignant invading ranges.
结论：（ 1）等中心面颈联合野设野原则可根据鼻咽癌侵犯的范围做个体化放疗设计。
Besides of the light shielding function it can also nourish the skin and block the damages by color make-up.
这款产品牌富含稍微的遮瑕作用以外，更可以调养润泽肤质部位并隔绝彩妆对肤质部位引发的敏感损害。
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