Electron Isodose Curves Flashcards

1
Q
For 6MV electron beam (SSD100, 10x10cm field):
SD
ZMax
preD90
postD90
R50
R10
Brem Tail
A
SD = 75%
Max = 1.5
preD90 = 0.8
postD90 = 2
R50 = 2.5
R10 = 3

Tail = 0.5%

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2
Q
For 9MV electron beam (SSD100, 10x10cm field):
SD
ZMax
preD90
postD90
R50
R10
Brem Tail
A
SD = 83%
preD90 = 1
ZMax = 2
postD90 = 3
R50 = 3.5
R10 = 4.5

Tail = 1%

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3
Q
For 12MV electron beam (SSD100, 10x10cm field):
SD
ZMax
preD90
postD90
R50
R10
Brem Tail
A
SD = 83%
preD90 = 0.5
ZMax = 3
postD90 = 4
R50 = 5
R10 = 6

Tail = 2%

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4
Q
For 20MV electron beam (SSD100, 10x10cm field):
SD
ZMax
preD90
postD90
R50
R10
Brem Tail
A
(Note 16Mev looks similar)
SD = 95%
preD90 = NA
ZMax = 2.3!!! Broad 
postD90 = 6
R50 = 8.5
R10 = 10.5

Tail = 5%

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