目的：观测加速器治疗床对放疗剂量的影响。

Objective: To investigate the effect of radiotherapy dosage caused by the accelerator table.

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利用加速器治疗肿瘤时，通常要在射线束的路径上加入楔形板以改变平野的剂量分布。

When an accelerator is used to treat tumour of illness, the distribution of doses is changed by commonly inserting a wedge into the path of radial beam.

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最新的治疗-质子放射治疗-包括一个质子加速器，可以像一个足球场那样庞大。

The latest treatment - proton radiation therapy - involves a proton accelerator that can be as big as a football field.

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