Hello freesurfers, Does anyone know the physical meaning of the "transform matrix" and the "quasinewton matrix" outputted during "EM Registration" of auto-recon2? For some odd reason, both of them are identity matrices (one's along the diagonal). I am almost certain that should not be the case.
Here is some context: ************************************************ Computing MAP estimate using 1658 samples... ************************************************ * dt = 5.00e-06, momentum=0.80, tol=1.00e-05* * l_intensity = 1.0000* * Aligning input volume to GCA...* * Transform matrix 1.00000 0.00000 0.00000 0.00000; 0.00000 1.00000 0.00000 0.00000; 0.00000 0.00000 1.00000 0.00000; 0.00000 0.00000 0.00000 1.00000;* * nsamples 1658 Quasinewton: input matrix* * 1.00000 0.00000 0.00000 0.00000; 0.00000 1.00000 0.00000 0.00000; 0.00000 0.00000 1.00000 0.00000; 0.00000 0.00000 0.00000 1.00000;* * THE SEARCH DIRECTION IS NOT A DESCENT DIRECTION IFLAG= -1 LINE SEARCH FAILED. SEE DOCUMENTATION OF ROUTINE MCSRCH ERROR RETURN OF LINE SEARCH: INFO= 0 POSSIBLE CAUSES: FUNCTION OR GRADIENT ARE INCORRECT OR INCORRECT TOLERANCESoutof QuasiNewtonEMA: 005: -log(p) = -0.0 tol 0.000010* * Resulting transform:* * 1.000 0.000 0.000 0.000; 0.000 1.000 0.000 0.000; 0.000 0.000 1.000 0.000; 0.000 0.000 0.000 1.000;* * pass 1, spacing 8: log(p) = -4.8 (old=-5.1)* * transform before final EM align:* * 1.000 0.000 0.000 0.000; 0.000 1.000 0.000 0.000; 0.000 0.000 1.000 0.000; 0.000 0.000 0.000 1.000;* Thank you and happy holidays! - Mark
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