Dear Zheng,

Combination of the 3D T2* map and the time course is done within the code . All you need to do is specify a 3D map file and a time course file which consists of two columns [time, intensity]. Intensity is multiplied with the 3D map in the code. This way you get variations of your map in time .  

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On 18 Nov 2009, at 18:26, Zheng Liu <[log in to unmask]> wrote:

Hi Ivana,

 

Thanks for your help very much. I have read the discription you told me. T2* maps should be 4D volumes and the 4th dimension would be time points. When use 3D T2* map and a modulation time course, I want to know how the time course make the 3D T2* varying with time, or make the T2* map chang to 4D.

 

Also Is there some T2*(t) function with BOLD stimulus?

 

Thank you and have a good day.

 

Best,

Zheng

On Tue, Nov 17, 2009 at 11:14 PM, Ivana Drobnjak <[log in to unmask]> wrote:

Dear Zheng,

You can find the description at
http://www.fmrib.ox.ac.uk/fsl/possum/input.html

Best,
Ivana

On 17 Nov 2009, at 23:45, Zheng Liu wrote:

Hi all,

Do anybody know how to simulate fMRI? I want to use Possum to do it, but I don't know how to create my own T2* map with varying time.

Thanks for any advice.

Zheng

--
Dr. Zheng Liu
Postdoctoral student in Computer Vision and Image Analysis Lab
Department of Electrical and Computer Engineering
Texas Tech University, Lubbock, TX 79409

--
Dr. Zheng Liu
Postdoctoral student in Computer Vision and Image Analysis Lab
Department of Electrical and Computer Engineering
Texas Tech University, Lubbock, TX 79409