Dear HweeLing
If you type help spm_read_vols you can see that it is in mm i.e. scanner coordinate system if you have not done any spatial normalisation and MNI if you have normalised your images to a template in MNI space.
Best
Torben
>> help spm_read_vols
Read in entire image volumes
FORMAT [Y,XYZ] = spm_read_vols(V,mask)
V - vector of mapped image volumes to read in (from spm_vol)
mask - implicit zero mask?
Y - 4D matrix of image data, fourth dimension indexes images
XYZ - 3xn matrix of XYZ locations returned (in mm)
__________________________________________________________________________
For image data types without a representation of NaN (see spm_type),
implicit zero masking can be used. If mask is set, then zeros are
treated as masked, and returned as NaN.
__________________________________________________________________________
Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging
Den 02/08/2010 kl. 18.47 skrev HweeLing Lee:
>
> Hi,
>
> I was wondering that the XYZ coordinates from spm_read_vols are in MNI format or world voxel coordinates.
>
> --
> Best wishes,
> HweeLing
|