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Dear Ivana, When I used example data to run Possum, I only acquired one 3D volume as fMRI data set. But the fMRI data set should be 4D and the fourth dimension should be time. Why was that? Thanks, Zheng On Thu, Nov 19, 2009 at 11:01 AM, Ivana Drobnjak <[log in to unmask]>wrote: > 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 . > > Sent from my iPhone > > 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 > > -- Dr. Zheng Liu Postdoctoral student in Computer Vision and Image Analysis Lab Department of Electrical and Computer Engineering Texas Tech University, Lubbock, TX 79409