Sorry, I don't know what the difference is. I always use the mean update volume as the template for registration.

On 07/13/2017 01:57 PM, Fu, Jason (NIH/NINDS) [F] wrote:

ac/tof is attenuation corrected/time of flight. Ac/hd is attenuation corrected/head.

-----Original Message----- From: Douglas N Greve [mailto:greve@nmr.mgh.harvard.edu] Sent: Thursday, July 13, 2017 12:52 PM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] PETsurfer AC/TOF

sorry, what is an ac/tof file?

On 07/13/2017 12:12 PM, Fu, Jason (NIH/NINDS) [F] wrote:

...

Hi,

I am currently using PETsurfer PVC to determine glucose metabolism differences in certain structures between the brain hemispheres. I am currently using ac/tof files to coregister to the anatomy. One of the patients did not have the ac/tof files, would ac/hd files work instead?

Thanks, Jason Fu

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