I am trying to convert MNI305 coordinates to RAS.
I have only been able to find a way to find MNI305 from RAS but not the other
way around:
MNI305RAS = TalXFM*Norig*inv(Torig)*[tkrR tkrA tkrS 1]' from
http://surfer.nmr.mgh.harvard.edu/fswiki/CoordinateSystemshttp://surfer.nmr.mgh.harvard.edu/fswik
]
Sent: Thursday, January 29, 2015 3:33 PM
To: Freesurfer support list
Subject: Re: [Freesurfer] MNI305 coordinates to RAS
Hi Juan
if you invert that matrix it will go the other direction
cheers
Bruce
On Thu, 29 Jan
2015, Diaz Rodriguez, Juan wrote:
> I am trying to convert MNI305 coordinates
Subject: Re: [Freesurfer] MNI305 coordinates to RAS
Hi Juan
add a 4th row that is [0 0 0 1], then invert it
cheers
Bruce
On Thu, 29 Jan 2015, Diaz Rodriguez, Juan wrote:
> Hi Bruce,
>
> The problem is that it TalXFM is a 3x4 matrix. It needs to be a square matrix
> to be invert
I am trying to create a spherical ROI mask in the form of a volume file with
2.5 cm radius. I also have to specify the center of the ROI location. What is
the best way to accomplish this?
I intend to use this to extract freesurfer cortical thickness values for a
region-of-interest (ROI) defined
