[Mristudio-users] File Type Question

[Armen Gharibans]

Susumu and Hangyi,

Thanks for the replies.  When I load the analyze date with MRI View3D,  
it shows all 31 images in the drop down menu.  When I was saving it to  
raw data, I selected all the images and it saved it in one .dat file.   
When I want to load the .dat file in MRI View 3D, I have to click  
"Float" in the "Image Data Format" for it to give the right images.   
When it opens it up, there is only Image.dat in the drop down menu,  
but there are 31x6 images stacked on each other basically as if there  
were 186 slices.  Is this correct?  I can click through all of them.

When I try to open up the .dat file in DTI Mapping, I choose Philips  
REC.  I get the error message,

"File size is smaller than DW-image size, continue anyway?"

The scans are actually of the calf muscle, we are trying to track the  
fibers in the muscle.  The Image Dimension is 64x64.  The voxel size  
is 200x200mm and slice thickness 10mm.

Armen


On Oct 14, 2009, at 10:13 AM, susumu mori wrote:

> Hi Armen,
>
> That means, the gradient table and the file size didn't match.
> When you converted the analyze to raw, I assume that you saved all  
> images in one file. Then, your file size should be;
>
> 192x192 (I assume that your in-plane resolution is 192x192) x 6 x  
> (30+1 b0) x 2 (integer).
>
> Then your gradient table should have 31 (30 dwi +1 b0) lines.
>
> Ignore the error message and load the data. See if the dimension of  
> your images are correct. Look at the pull-down menu to see you  
> really have 31 images loaded.
>
> Close the window and choose "DtiMapping" again. In the opening  
> window, it still remembers the gradient table you specified in the  
> previous session. Inspect the table and make sure that you have 31  
> lines.
>
> Susumu


> On Oct 14, 2009, at 7:53 AM, Hangyi Jiang wrote:
> hi,  Armen,
>
> with "File->DTI Mapping" command, choose "Philips REC" for your  
> resaved .dat file, it should work  if the .dat file contains all  
> directional images and if the image data type is in 16 bits unsigned  
> integer.
>
> regards,
>
> hangyi


> On Tue, Oct 13, 2009 at 1:30 PM, Armen Gharibans <ghariba1 at illinois.edu 
> > wrote:
> I have Analyze data file that I can open and view in MRI View3D.  It
> is 6 slices and 30 different directions in one analyze file and a
> separate header file.  When I try to do DTI Mapping, it doesn't give
> the option for Analyze data, so I used MRI View3D to convert the
> Analyze data to Raw Data and also NRRD, and I get errors with both.
> My gradient table should be correct.
>
> When I try to use the raw data, which is just one .dat file, I get the
> message, "Number of files in this fold is less than expected."  I am
> guessing that is because the raw data should be a bunch of .bin
> files.  Why did it save it in one .dat file?
>
> Thank you.
> Armen Gharibans
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