[Mristudio-users] Mean_ADC units

[jiangxi]

Hi,susumu

    Thanks for your advice. When I use the "thresholding" tool to define WM cortex boundary with ranging from 0.15-0.25, it appears many red points in the FA map to express the WM cortex. But I'm still confused with the sequence steps: 1.How to save the red point- labeled FA map? 2.how can I use the map to reconstruct the WM surface? 3.How can the reconstructed the WM surface be visualized?   Many thanks!
 


Date: Thu, 5 Mar 2009 14:28:52 -0500
From: susumu at mri.jhu.edu
To: mristudio-users at mristudio.org
Subject: Re: [Mristudio-users] Mean_ADC units









I suggest to use RoiEditor. Load your FA map and use the "thresholding" or "region growing" tool to define the white matter - cortex boundary with FA = 0.15-0.25. This usually gives the good white matter surface.
 
If you need skullstip, load b0 or mean(DWI) image (you can create it by DtiStudio) and use the thresholding or region growing tool to define the brain outline. Register it as one object and use "+-/x" button to use the object as "masking". This usually can clean up all the extra-cranial junks.
 




From: mristudio-users-bounces at mristudio.org [mailto:mristudio-users-bounces at mristudio.org] On Behalf Of jiangxi
Sent: Wednesday, March 04, 2009 11:21 PM
To: mristudio-users at mristudio.org
Subject: Re: [Mristudio-users] Mean_ADC units
 
Hi,
  I'am wondering that how to use DTI data to reconstruct the cerebral cortex surface or WM surface. The DTIStudio seems that can only carriy out to the fiber-tracking step. Thanks!
 
> Date: Wed, 4 Mar 2009 15:55:29 -0500
> From: hjiang at jhmi.edu
> To: mristudio-users at mristudio.org
> Subject: Re: [Mristudio-users] Mean_ADC units
> 
> its unit is (mm^2/s) when you consider the b-value during the calculation.
> 
> hangyi
> 
> 
> 
> >>> Moran Artzi <artzimy at gmail.com> 03/04/09 2:34 PM >>>
> Hi
> what units are used when reporting the ADC Map - Mean value on the
> DTI-Studio Fiber Statistic option?
> ADC Map - Mean
> Max. of ImgVal: 4.2198
> Min. of ImgVal: 0.1643
> Mean of ImgVal: 0.9090
> Std. of ImgVal: 0.3467
> 
> Many thanks
> 
> Moran
> 
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