Hi Bruce, You are correct that it is B1. How could I incorporate this data into the reconstruction stream? Thanks,Xiaomin
From: yuexm@hotmail.com To: freesurfer@nmr.mgh.harvard.edu Subject: RE: [Freesurfer] B1 correction Date: Wed, 26 Mar 2014 13:54:37 -0400
thanks. Xiaomin Yue
Date: Wed, 26 Mar 2014 11:54:58 -0400 From: fischl@nmr.mgh.harvard.edu To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] B1 correction
Hi Xiaomin
do you mean dividing by the Jacobian of the B0 unwarping field? Are you sure it's not B1? That is by far the more common intensity normalization for an mprage. The B0 effects are small due to the high bandwidth of the mprage.
I think Rudolph and/or Doug have tools for multiplying or dividing images, but I'm not sure what they are called.
cheers Bruce
On Wed, 26 Mar 2014, Xiaomin Yue wrote:
Hi Bruce, Thanks for your response. It is B0 normalization scan. What it does is to get an homogeneity image, which could be used to normalize the MRRAGE image by dividing it. Is there an build in function in freesurfer to do this operation?
Thanks, Xiaomin
Date: Mon, 24 Mar 2014 12:42:52 -0400 From: fischl@nmr.mgh.harvard.edu To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] B1 correction
Hi Xiaomin
can you be more specific? What kind of B1 field map did you collect? Do you mean B1 transmit or receive?
cheers Bruce On Mon, 24 Mar 2014, Xiaomin Yue wrote:
Hi,
B1 field correction was collected during the scan. My question is how it
can be used in the surface reconstruction?
Thanks,
Xiaomin Yue
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