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ptaylor

February 07, 2019 04:44PM

Moderator
Registered: 11 years ago
Posts: 2,321

Hi, Giuseppe-

Well, when I run the fat_proc command, all the dwi_* and dt_* files produced by fat_proc_dwi_to_dt have the same geometry (in this case, it is the origin that we are talking about):

3dinfo dwi*gz dt*gz  | grep MATRIX 

Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"
Geometry String: "MATRIX(1.5,0,0,-94.74982,0,1.5,0,-99.7506,0,0,1.5,-72.75083):128,157,115"

If you use the dwi_dwi.nii.gz made by fat_proc._dwi_to_dt with your dt*FA.nii.gz measures, then your files should have the same geometry. The TORTOISE-output DWI file, whose MATRIX is different, can be so because the fat_proc_dwi_to_dt re-centers the DWIs over the input "ref_orig" file as part of its workings-- one can expect in general that the output DWI file form TORTOISE could (likely will) have a different origin than the one that has been re-aligned to the ref_orig dset. The values in teh DWI files should be the same-- it is just the location+orientation information that would be different.

--pt

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Subject	Author	Posted
Output geometry side effect in fat_proc_dwi_to_dt	giuseppe.cabras@uniud.it	February 04, 2019 03:45PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	ptaylor	February 06, 2019 05:40PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	giuseppe.cabras@uniud.it	February 07, 2019 01:28PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	ptaylor	February 07, 2019 02:11PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	giuseppe.cabras@uniud.it	February 07, 2019 03:20PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	giuseppe.cabras@uniud.it	February 07, 2019 03:28PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	ptaylor	February 07, 2019 04:44PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	giuseppe.cabras@uniud.it	February 08, 2019 10:01AM
Re: Output geometry side effect in fat_proc_dwi_to_dt	ptaylor	February 08, 2019 02:28PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	giuseppe.cabras@uniud.it	February 11, 2019 03:52AM
Re: Output geometry side effect in fat_proc_dwi_to_dt	ptaylor	February 11, 2019 10:15AM
Re: Output geometry side effect in fat_proc_dwi_to_dt	giuseppe.cabras@uniud.it	February 11, 2019 01:19PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	ptaylor	February 11, 2019 01:36PM
Re: Output geometry side effect in fat_proc_dwi_to_dt	giuseppe.cabras@uniud.it	February 12, 2019 11:34AM