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Hi John


Not the same subject, but that problem is now solved. However, I have misunderstood the function of Coregister till now. What does Coregister do that Align doesn't, please? Can you point me at a description of them?


Thanks


Helen Beaumont 

From: John Ashburner <[log in to unmask]>
Sent: 04 April 2017 04:49:36
To: Beaumont, Helen
Cc: [log in to unmask]
Subject: Re: [SPM] Help with coregister please
 
If these are images of the same subject, then it should be possible to fix up the voxel sizes in the headers to allow a reasonable rigid-body alignment to be achieved.  If this is the case, I'm not sure how things got messed up in the first place.

Best regards,
-John


On 3 April 2017 at 20:12, Beaumont, Helen <[log in to unmask]> wrote:

Hi John


Thanks for the fast response.


I thought align was the rigid body registration, and coreg did at least grow/shrink images? Obviously I have been wrong for years. Is there anything which will allow me to bring two images into a common space? Normalise only seems to take images into standard space.

From: John Ashburner <[log in to unmask]>
Sent: 03 April 2017 14:01:53
To: Beaumont, Helen
Cc: [log in to unmask]
Subject: Re: [SPM] Help with coregister please
 
Coregistration does a rigid body registration, so it does not change the size of things in the image.  I'd suggest taking a look at the images before you coregister them.  I'd guess that one brain is bigger than the other before you begin.  Maybe something (eg skull-stripping) is messing up the voxel sizes in the image headers.

Best regards,
-John


On 3 April 2017 at 19:04, Beaumont, Helen <[log in to unmask]> wrote:

Hi


I am trying to coregister two skull-stripped images using default settings for everything, and it is doing a terrible job. The two brains come out as very different sizes.  I have checked the voxels around the brains, and they are 0. It runs without error. I've attached the output of the coregister - please can someone suggest what might be going wrong

 

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The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail.