Unknown exception during DWI writing!

[GiggioIlGriggio]

Trying to perform any simulation with fiberfox ends up with the following error. Is happening both with linux and windows. I leave here the log text.

Logfile: /home/compa/Documents/Apps/MITK-Diffusion-2018.09.99-linux-x86_64/Savings///fiberfoxb1000_StickBall_RELAX.log
0:0:0 > Starting Fiberfox dMRI simulation
Output image spacing: [2,2,2]
Output image size: [20,20,3]
Working image spacing: [2,2,2]
Working image size: [20,20,3]
No tissue mask set

Setting fiber radius to infµm to obtain full voxel.

0:0:0 > Generating 2-compartment diffusion-weighted signal.
b-values: 0 1000 
Volumes: 33


0%   10   20   30   40   50   60   70   80   90   100%
|----|----|----|----|----|----|----|----|----|----|
***************************************************


0:0:0 > Simulating k-space acquisition using 1 coil(s)
Acquisition type: single shot EPI
Simulating signal relaxation
Parallel volumes: 6
Threads per slice: 5
0%   10   20   30   40   50   60   70   80   90   100%
|----|----|----|----|----|----|----|----|----|----|
****************************************************

0:0:1 > Finalizing image
0%   10   20   30   40   50   60   70   80   90   100%
|----|----|----|----|----|----|----|----|----|----|
***************************************************

0:0:1 > Finished simulation

Unknown exception during DWI writing!

[peterneher]

Hi, could you send me the complete command you used? "Unknown exception during DWI writing!" sounds like there is something wrong with the path. But I will take a look!

If possible, could you also send me the test data you used?

[GiggioIlGriggio]

Hi, thanks for the reply!
So in order to reproduce the error this is what I did:
1 Generate 50 random bundle with "Fiber_generator" with all standard parameters.
2. In Fiberfox tab set as fiber_bundle one of the generated bundles, and as "save_path" an empty folder. "template_image" and "tissue_mask" are left empty.

Finnaly running the simulation with all standarrd parameters in the fiberfox tab gives that error.

P.S. I have also tried to run the simulation by downloading the "FilesForSimulation" of the ISMRM Tractography Challenge and using ther fiber_bundle, template image, tissue mask and simultion parameters. The simulation takes longer times but in the end it gives the same error.

If you need the actual data I can provide it to you, but the error occurs also without any specific data as I showed in the first example

[peterneher]

This error seems to occur if you set a file name and not only a path. Did you try to just set "Save path:" to e.g. "/home/neher/Downloads/" without an actual file name?

[peterneher]

Keep in mind that you need to provide a template image if you want an output image that actually fits your fibers in terms of size. You can e.g. use a TDI of the fibers or something similar.

[GiggioIlGriggio]

This error seems to occur if you set a file name and not only a path. Did you try to just set "Save path:" to e.g. "/home/neher/Downloads/" without an actual file name?

I have tried just with a folder path. Also because the tool is supposed to save multiple files other then the log file, so I don't know which specific path to provide at this point.

Keep in mind that you need to provide a template image if you want an output image that actually fits your fibers in terms of size. You can e.g. use a TDI of the fibers or something similar.

Regarding this I have tried to use also a template from the ISMRM Tractography Challenge. In fact, as I mention in the first message, i have tried to replicate the data generation since the challenge provide all the necessary data on their official webite (Fiber bundle, template image, tissue mask, params etc...)

[GiggioIlGriggio]

UPDATE: if i leave the save_path empty it finish the execution, and then i can save it manually. In the save_path box the only option is to choose a directory, not a file.

[peterneher]

Great that there is a workaround! Nevertheless, I will try to look into this.

Which version are you using exactly? And which operating system?

[peterneher]

I uploaded a new version(Ubuntu) to https://www.mitk.org/download/diffusion/nightly/

I checked, and the automatic save should work there. Could you verify?