Hi - yes I think you will need to swap the bvecs too. 
You can find out easily by running dtifit and looking at the V1 output.

Cheers
Saad

On 19 Apr 2013, at 08:15, Xiangzhen Kong <[log in to unmask]> wrote:

Hi all.
I get the nii.gz file and bvecs using dcm2nii. The nii.gz file is in the LAS orientation.
I wonder if I swap it to RAS orientation, is the bvecs file still suitable for DTIFit?
Or I have to swap the bvecs as is done on nii.gz file?

Thanks.

Xiang-zhen

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Kong Xiangzhen
State Key Laboratory of Cognitive Neuroscience and Learning,
Beijing Normal University,
Beijing, China, 100875.

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Saad Jbabdi
University of Oxford, FMRIB Centre

JR Hospital, Headington, OX3 9DU, UK
(+44)1865-222466  (fax 717)