Hello everyone,

I am a beginner using MRICron. For a research project I manually drew the lesion areas of several stoke patients in MRICron in axial view. I aimed to create .VOI files - one for each patient - in order to create overlays afterwards. 

Instead of saving the VOIs via Draw->Save VOI I saved the files via File->Save as NIfTI and chose the .voi format. When trying to open the images again the drawn lesions were not in the file anymore. Now I found out that I probably had saved new templates instead of saving VOI. 

Do you know of any way to convert the NIfTI files to VOI to make the drawn lesions visible again?

Thanks in advance for your help and kind regards
Nadine

The File/SaveAsNIfTI option saves the MRI scan you are viewing. This allows you to convert various image formats (MGH, NRRD, ECAT) to NIfTI. The Draw/SaveVOI option saves your drawing. This is described in the manual:
  https://people.cas.sc.edu/rorden/mricron/stats.html
If you are just getting started, and are using a computer built in the last decade, I would suggest you use the modern MRIcroGL instead of the legacy MRIcron
  https://www.nitrc.org/plugins/mwiki/index.php/mricrogl:MainPage#Drawing_Regions_of_Interest
While I am glad that my classic tools have remained popular and robust, I have a heavy teaching, administration, service and research load, so have little time to support these older tools.

Dear Mr. Rorden, 

thank you very much for your reply! 

Kind regards!