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
> > 
> >
> 
> _______________________________________________ Freesurfer mailing list
> Freesurfer@nmr.mgh.harvard.edu
> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information
> in this e-mail is intended only for the person to whom it is addressed. If
> you believe this e-mail was sent to you in error and the e-mail contains
> patient information, please contact the Partners Compliance HelpLine at
> http://www.partners.org/complianceline . If the e-mail was sent to you in
> error but does not contain patient information, please contact the sender
> and properly dispose of the e-mail.
> 
>