[Insight-users] is it reasonable about my registration result using itk::MattesMutualInformationImage?

[Dongfeng Han]

Hello everyone
I use Bspline and MattesMutualInform metric to registration two 3D
volume with size
fiximage 512X512X10 and movingimage 512X512X12,space is 0.97X0.97X2mm

Her I cout the metric value
I want ti know if my value is in a reasonable range?
I am not sure about it.
I remeber that the MI metric should get a positive value? (may be I am wrong)
thanks
Of course, the value is decreased but I am not sure my result is reasonable.
thanks

At each iteration
the metric value and the InfinityNormOfProjectedGradient are,(the
first column is the iteration)
 0   -0.76045   0
0   -0.77221   0
0   -0.77221   0.00276957
1   -0.773994   0.00276957
1   -0.773994   0.0013033
2   -0.776446   0.0013033
2   -0.776446   0.00155006
3   -0.79011   0.00155006
3   -0.79011   0.00370379
4   -0.806038   0.00370379
4   -0.806038   0.00403227
5   -0.763233   0.00403227
5   -0.820104   0.00403227
5   -0.820104   0.00428924
6   -0.575763   0.00428924
6   -0.826047   0.00428924
6   -0.826047   0.00472157
7   -0.818149   0.00472157
7   -0.829781   0.00472157
7   -0.829781   0.00292365
8   -0.834937   0.00292365
8   -0.834937   0.00241031
9   -0.842242   0.00241031
9   -0.842242   0.00396388
10   -0.854613   0.00396388
10   -0.854613   0.00381085
11   -0.856786   0.00381085
11   -0.856786   0.00531766
12   -0.870652   0.00531766
12   -0.870652   0.0021856
13   -0.875677   0.0021856
13   -0.875677   0.00263254
14   -0.881102   0.00263254
14   -0.881102   0.00322017
15   -0.883367   0.00322017
15   -0.883367   0.00162691
16   -0.885104   0.0016269