Course book Advanced Treatment Planning 2018

Analysis of variance

Observer places O 1,

Observer places O 2

Computer places O 3

Measure distances for many scans and landmarks

o

1

o

Compute standard deviations of differences

2

Solve for standard deviation of individual observers

2

2

2

2

μ

( = + − σ σ σ σ

) / 2

1

2 1 −

3 1 −

3 2 −

2 2 2 3

2

2

2

( = + − σ σ σ σ

) / 2

3 2 −

2 1 −

3 1 −

2

2

2

( = + − σ σ σ σ

) / 2

3 1 −

3 2 −

2 1 −

o

3