# No b0! Error with the brain masking process

**URL:** <https://discourse.slicer.org/t/no-b0-error-with-the-brain-masking-process/13448>\
**Category:** SlicerDMRI\
**Created:** [September 11, 2020, 6:35pm UTC](https://discourse.slicer.org/t/no-b0-error-with-the-brain-masking-process/13448 "2020-09-11T18:35:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Nicholas.jacobson](https://avatars.discourse-cdn.com/v4/letter/n/ba8739/32.png) [@Nicholas.jacobson](https://discourse.slicer.org/u/Nicholas.jacobson)\
**Post date:** [September 11, 2020, 6:35pm UTC](https://discourse.slicer.org/t/no-b0-error-with-the-brain-masking-process/13448/1 "2020-09-11T18:35:41Z")

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Hello,  
We are starting to research Tractragraphy for 3d printing purposes and struggling to get the process started with our images. We have loaded all of our dwi images but run into a problem with the brain masking program returning an error saying we have no b0. We do indeed have a b0 in these files but something is getting lost. Is someone able to take a look at my files to help guide us back on tract?

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**Author:** ![Nicholas.jacobson](https://avatars.discourse-cdn.com/v4/letter/n/ba8739/32.png) [@Nicholas.jacobson](https://discourse.slicer.org/u/Nicholas.jacobson)\
**Post date:** [September 11, 2020, 11:18pm UTC](https://discourse.slicer.org/t/no-b0-error-with-the-brain-masking-process/13448/2 "2020-09-11T23:18:20Z")

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Update. My files contain a Multivolume, each direction as a separate scalar, and a DWI volume. Exploring the metadata shows there is more then one b0 and the rest are showing as b800. When loaded and exploring the node information I see a ton of data. However, when I explore the sample data, it reflects a very clear b0 and subsequent set of coordinates for each image. So something with my data is not translating. Any guidance is welcome.

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**Author:** ![Chris\_Rorden](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chris_rorden/32/4073_2.png) [@Chris\_Rorden](https://discourse.slicer.org/u/Chris_Rorden)\
**Post date:** [September 12, 2020, 11:13am UTC](https://discourse.slicer.org/t/no-b0-error-with-the-brain-masking-process/13448/3 "2020-09-12T11:13:29Z")

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Can I suggest you try converting these images with [dcm2niix](https://github.com/rordenlab/dcm2niix/releases). You could either run this directly from the command line, or you could install the Slicer Extension (select the View/ExtensionManager menu item and search for “SlicerDcm2nii”). Each vendor has their own method for [storing gradient information in a DICOM](https://www.na-mic.org/wiki/NAMIC_Wiki:DTI:DICOM_for_DWI_and_DTI), and each vendor has changed their storage over the years. Therefore, using a different conversion tool may help.

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**Author:** ![Nicholas.jacobson](https://avatars.discourse-cdn.com/v4/letter/n/ba8739/32.png) [@Nicholas.jacobson](https://discourse.slicer.org/u/Nicholas.jacobson)\
**Post date:** [September 14, 2020, 3:57pm UTC](https://discourse.slicer.org/t/no-b0-error-with-the-brain-masking-process/13448/4 "2020-09-14T15:57:51Z")

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That worked! Thank you.