Hello,
This is good, it is as we figured it might be. But just to clarify.. We are
using this to get seed regions from the same subject different sessions in the
same space, size and shape. I assume --interp=nn is the best way to achieve
this?
Thank you both for you help,
Sandra
Sandra Woodman
Mood and Motor Control Laboratory
Athinoula Martinos Center for Biomedical Imaging
Massachusetts General Hospital
120 6th St.
Charlestown, MA 02129
Tel: 617-643-6245
Fax: 617-726-1351
Email: [log in to unmask]
-----Original Message-----
From: FSL - FMRIB's Software Library on behalf of Mark Jenkinson
Sent: Thu 10/6/2011 2:50 PM
To: [log in to unmask]
Subject: Re: [FSL] applywarp --interp default, how to shut off??
Hi,
As Ben said, nearest neighbour is as close as you can get to
no interpolation. It uses the intensities from the original image
without changing them, so I don't know what else you could
want. If you actually want resampled images to be similar
from different sources then I would actually recommend
interpolation such as spline. This is what we use for averaging
structural images that have been resampled into the same
space.
All the best,
Mark
On 6 Oct 2011, at 19:42, Woodman, Sandra wrote:
> Yes. We are using this now. But is there a way to have no interpolation
> whatsoever done on the data? (individual subject). We are comparing two
> different sessions and would like the images to be as similar as possible.
>
> Also is it correct that trilinear is the default?
>
> Thank you for your help!
>
> Sandra
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: FSL - FMRIB's Software Library on behalf of Benjamin Kay
> Sent: Thu 10/6/2011 2:19 PM
> To: [log in to unmask]
> Subject: Re: [FSL] applywarp --interp default, how to shut off??
>
> On Thursday, October 06, 2011 14:13:04 you wrote:
>> Hello FSL world,
>>
>> We are using the applywarp command to make an affine transform from one
>> session to another. Can you use 'applywarp' without using the
>> interpolation (--interp) flag? If you do not specific a --interp flag
>> does it do the default, which is trilinear correct? Or with the --interp
>> left off, will no interpolation been done? Is there a way to set up the
>> command line so that you force no interpolation?
>
> If you use --interp=nn you will get nearest neighbor interpolation, which is
> probably what you mean by "no interpolation".
>
>
>
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