Radiotherapy quality can be improved by rapid assessment of the position and timely correction of set-up error.

因此在治疗中快速准确地做出摆位评估，及时纠正摆位误差，是保证放射治疗质量的关键。

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There is no significant differences in systematic and random set-up errors after shrinking field, except that the random set-up error variation is greater in the left-right direction.

缩野前后除左右方向上随机误差有显著差异外，其他各方向系统误差和随机误差没有显著差别。

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As we did for USERNAME in the previous step, set the value as required on the validation TAB, and set the control up to display validation error messages in an error message control.

如我们上一步对USERNAME做的一样，将验证选项卡上的值设为必须，然后在错误消息控制中设定显示验证错误消息。

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The second set went with serve until a Srichaphan error put Henman 5-4 up and he sealed his 6-3 6-4 win with an ace.

BBC: SPORT | Tennis | Henman safely past Srichaphan

He converted the third of his break points to open up a 2-1 lead in the first set, but an error in game eight handed Nadal a break back.

BBC: Davydenko wins Shanghai Masters