2017_IGRT course book

How much scatter from MV beam?

12000

• Raw signal

10000

• Unexposed frames

8000

6000

4000

Series1

Series3

2000

• Corrected signal

0

0

50

100

150

200

250

300

350

400

450

-2000

-4000

• 1 blank frame in 4: use frames/angle to control

-6000