[Mristudio-users] about effect of masking

[susumu at mri.jhu.edu]

Hi Jim,

When you do tensor calculation, you want to mask out the areas outside the brain. The easiest way is to use the threshold value to mask out the noise floor. This approach however leaves a lot of extra-brain tissues. RoiEditor (and many other programs) offers much more tools to define the brain as a binary map and remove other tissues using tools such as region growing and skull-strip tools. If you have any binary masking generated by another program you can load such a file through this function. 

Susumu

------Original Message------
From: Jim Li
Sender: mristudio-users-bounces at mristudio.org
To: DTI Studio, ROI Editor, Landmarker Questions/Support
ReplyTo: DTI Studio, ROI Editor,	Landmarker Questions/Support
Subject: [Mristudio-users] about effect of masking
Sent: Dec 5, 2008 17:57

Hi all,   Can anybody give me a hint?   In the  DTIstudio software I clicked the "Tensor, Color map, etc" button in the "Calculation" section of the "DtiMap" tab. Then, from the pop-out window called "DTI-Map Options", I saw a choice called "Select a mask-image". Under what situation should we use that choice? Should it be a default choice when the brain has some lesions, given that the lesional area can be at about the same level as the background noise level and thus can be easily wiped out even if we choose a low background noise level from which to create a mask-image?     Thanks a lot,   Jim _______________________________________________ Mristudio-users mailing list Mristudio-users at mristudio.org http://lists.mristudio.org/mailman/listinfo/mristudio-users 
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