2017_IGRT course book

kV vs MV - Contrast

“Impact of imaging beam spectrum on image quality”

kV

MV

Energy

S

10-20 times less

50 kV 18.5 %

1.25 MV 1.8 %

2.00 MV 1.4 %

6.00 MV 1.0 %

1 cm

20 cm

n

S

n’

n

kV

MV

10 A. Boyer et al. Med. Phys 1992;19(1)

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