[Brains-users] T1 and T2 voxel size

[Hans J. Johnson]

Cherie,

I am not the expert on this, but our aquisitions protocols are:

MR5:
T1       1.015625x1.015625x1.5
PD/T2  1.015625x1.015625x4.0

MR6:
T1       0.625x0.625x1.5
PD/T2  0.625x0.625x1.8


So it does not seem that having T1 and T2 aquired at different resolutions
should matter.

Hans



On 6/13/06 3:32 PM, "Cherie Marvel" <cmarvel1 at jhmi.edu> wrote:

> Hi IPL Folks,
>  
> Some of us have been left behind and are continuing to work while others are
> expanding their minds in Florence...
>  
> We are working out parameters to achieve a high resolution scan for T1 and T2
> for measuring brain structures.  Our scanner is a Phillips 3T.  I think we
> have a decent MPRAGE worked out, and the voxel size is .83 x .88 x 1.00.  The
> best T2 we can acquire without artifact, however, has a voxel size of 1 x 1 x
> 1.5.  We are acquiring in the sagittal plane (because it conforms with
> parameters of our concurrent fMRI study).
>  
> My question is whether the T1 and T2 images must be of the same voxel size.
> If not, how different can they "safely" be and still achieve accurate
> measures?
>  
> I have noticed in past protocols that the two voxel sizes may be slightly
> different (e.g., MR5).  However, it's unclear to me how BRAINS2 would handle
> registration, tissue classification, and volumetric measurements if the two MR
> images have different voxel sizes.
>  
> Any input on this would be greatly appreciated.
>  
> thanks,
>  
> --cherie
>  
>  
> Cherie L. Marvel, PhD
> Research Associate
> Johns Hopkins Medicine
> Department of Neurology
> Division of Cognitive Neuroscience
> 1620 McElderry St., Reed Hall E-2
> Baltimore, MD 21205
> Tel: (410) 502-4664
> Fax: (410) 502-2189
> www.jhu.edu/nimlab <http://www.jhu.edu/nimlab>
> 
> 
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> Brains-users at www.psychiatry.uiowa.edu
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