Issue with Jacobian determinant maps

[ndrewvo]

Hi,

I’m trying to use the CAT12 toolbox to compute DBM maps from T1w images. I used the default parameters and saved the Jacobian determinant map. The resulting map seems to have an issue in which all voxel values are inflated (i.e., above 1), even in the background, despite these T1w images being from patients with neurodegeneration. I’ve tried running the latest 12.9 and 12.8 versions but they both result in the same issue. Only if I downgrade to 12.7 does the DBM map look like expected.

Is there a preprocessing step or setting that I'm missing? Thanks in advance for any clarification!

Best regards, Andrew