Re: [Freesurfer] Origin of freesusrfer output

Hi Ritesh

Doug can correct any inaccuracies, but....

1. Yes, unless you tell recon-all not to. 2. I'm not sure what you mean by the origin, but we do keep track of the ras coordinates of the center of the volume after resampling (the so-called "cras"). 3. We do keep track of the original dicom coordinates. 4. mri_info will spit out various matrices, among them the voxel to ras transform that should take you back to scanner ras coordinates.

cheers Bruce

On Fri, 3 Aug 2018, Ritesh Mahajan wrote:

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Hi Bruce,

1. Free-surfer output is always 256*256*256, regardless of any input dimensions.
2. I have a doubt, while doing this re-sampling from input dimension to 256*256*256. Does free-surfer change the origin of image?
3. My input is an MRI dicom image, for dicom tag value (0020,0032) which gives me the image position(origin).
4. How can i know the origin of free-surfer output in nii format? Do free-surfer change this value during processing?

Can you please provide your valuable comments on this.

Thanks, Ritesh Mahajan