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Given that we correct all organ motion and setup

errors, why is the margin not zero?

A. We still need a margin for

residual errors

B. We still need a margin for

microscopic disease

C. A margin can never be smaller

than 5 mm

D. Excel is not accurate enough for

small margins

E. Margins are limited by the

Heisenberg uncertainty principle

We still need a margin for resi...

We still need a margin for mic...

A margin can never be smaller ...

Excel is not accurate enough f..

Margins are limited by the Hei...

76%

3% 3% 3%

16%