Is my perfusion file incomplete or am I incorrectly importing it? (DSC -> rCBV)

Hello,

I have a patient with a perfusion MRI which counts 925 slides originally in their electronic file. When exporting this file, our exporting software creates a folder with 37 files (925/25) and loading it into 3DSlicer through the Add DICOM Data module, it loads and is visible as a 3D image with 37 Slices

Now, the actual file format of these 37 files is a mystery to me as they are just named “file” and not a specific extension. Only through the Add DICOM Data module will they load properly.

A part of me thinks that the 4D data must somehow be embedded in these 37 files since the original is 925 slices and our exporter gives us 925/25 = 37 files. I am wondering if you have any leads for me to find out if this is actually the case, or if my search is futile because the file is just exporting erroneously.

I have tried to save this file as a .nii and loading it in through MultiVolumeImporter but this loads it as a 1 frame MultiVolume. This to me indicates that there is no timedata, but I might also be doing that myself by saving it as a .nii?

My ultimate goal is to use this scan to create an rCBV map of the perfusion scan, using the MultiVolumeImporter and DSCMRI-Analysis modules, and I haven’t been able to yet.

I’m super thankful for any unput or leads on where to go from here.

It’s possible that each of the 37 timepoints is a single volume file, but that’s not very common. More likely only one timepoint was exported. One easy way to check is to look at the file size. If it’s about 128k then it’s probably one MR slice. If it’s 25 times bigger it might be a full volume in a multiframe format (but again, that’s very rare).

Hi Pieper,

Thanks for you answer. It seems that it just the single 37 slices without time data then, considering the file size. Thank you for helping me along; at least I now know that the problem is on the data extraction side of things.

Sam