Microsoft Word - Scientific Program IGRT 2016 Madrid V3

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Mutual Information

H(I

MRI-CT

)

H(I

MRI-CT

)=H(I

MRI

) + H(I

CT

) - MI(I

MRI

,I

CT

)

The Mutual Information of 2 images is the

information that is common to both images

M (I

1

,I

2

)=Sp(I

1

,I

2

)log

2

maximized

when the are reg tered

p(I

1

,I

2

)

p(I

1

)P(I

2

)