Hi Jeongsik

the bandwidth, geometry and read-out matching ensure that there is no differential distortion between the scans, so unless you have a compelling reason I wouldn't change any of that.

And you definitely, definitely cannot reduce the voxel size to 2mm iso and expect to get anything reasonable.

cheers Bruce On Mon, 31 Oct 2016, 김정식 wrote:

Dear Freesurfer experts,

Regarding the recommended MRI protocol for FreeSurfer,

We have some questions.

I read that using T1 Multiecho MPRAGE and T2-SPACE FLAIR in the Freesurfer analysis would be helpful to enhance a Freesurfer result.

T2-SPACE FLAIR image must have both same voxel resolution (1x1x1) and bandwidth(651 Hz/px) equal to T1 image?

Is it possible to change voxel resolution of the T2-SPACE FLAIR to lower one (eg. 2x2x2), guaranteeing same Freesurfer result?

And one MRI expert recommended that T2-SPACE FLAIR should be acquired in axial orientation, not in sagittal orientation.

Is it right?

I'm wondering what the difference is between axial and sagittal acquisition orientation in the aspect of MRI quality and analysis result.

Best regards,

Jeongsik Kim

[@from=gitamen%40hanmail.net&rcpt=freesurfer%40nmr.mgh.harvard.edu&msgid=%3 C20161031103710.AFiqCWu0REKT7xuZN-rV5A%40gitamen.hanmail.net%3E]