What is the meaning of each image filename?

[fleeting]

Hi everyone,

I used lead-dbs to do coregistration, normalization and brainshift correction. It has generated lots of files, but I don’t know what the gl- means, like glanat.nii, glpostop_ct.nii, and tp- like tp_rpostop_ct.nii, tp_glpostop_ct.nii and so on.

I didn’t find out them in the manual, is there anyone who knows meanings of them?

Thanks,
Hao

[ningfei]

Hi Hao,

As you may already know from the images, ‘gl’ files are normalized image, ‘tp’ means ‘tone mapped’ image and ‘rpostop_ct.nii’ is coregistered image.

Best,
Ningfei

[fleeting]

Hi Ningfei,

Thanks for your reply! I still have a question.

During process of coreg. and normalization the program generated a image called tp_glpostop_ct.nii, I wonder whether this should be tp_glRpostop_ct.nii? I see the manual says it first coreg. post-operative image to pre-operative image, and then coreg. to MNI space based the transformation parameters found when coreg. pre-operative to template. The tp_glpostop_ct.nii looks like be coregisterd from postop_ct to MNI space directly. Did I think correctly?

Best,
Hao

• This reply was modified 4 years, 11 months ago by fleeting.

[ningfei]

Hi Hao,

No, ‘glpostop_ct.nii’ is calculated based on ‘rpostop_ct.nii’. It’s a two-step normalization: ‘postop_ct.nii’ -> ‘rpostop_ct.nii’ (aligned with anat_t1.nii) -> ‘glpostop_ct.nii’ (nomalized to MNI space). Since it’s the normalization of ‘postop_ct.nii’ in the end, I think it make sense to use ‘glpostop_ct.nii’. See in your preference file (Lead-dbs menu -> Preferences -> Edit Preferences File). ‘prefs.ctnii_coregistered’ and ‘prefs.gctnii’ are defined there.

Best,
Ningfei

[fleeting]

Thanks! It really helps me a lot!

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