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Exact matches may be highly sensitive to geometrical

uncertainties and inaccuracies

- Uncertainty/inaccuracy in gantry angles, leaf positions

- Patient motion in between delivery of fields

- Uncertainty/inaccuracy in field edge

0

50

100

-10.0

-5.0

0.0

5.0

10.0

6 MV, 10x10, 100

Slope: 15%/mm