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DicomToMesh
A command line tool to transform a DICOM volume into a 3d surface mesh (obj, stl or ply). Several mesh processing routines can be enabled, such as mesh reduction, smoothing or cleaning. Works on Linux, OSX and Windows.
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I am using this to generate the mesh. https://github.com/AOT-AG/DicomToMesh
Keep in mind that DICOM images are always converted to the NIfTI format when dealing with neuroimaging data, so the different software are expecting this image type. You should always keep the original DICOM files in your archive, but convert them to NIfTI and use that as your raw data input. To convert DICOM to NIfTI, you can use a tool like dcm2niix dcm2niix.
What I would recommend is to use either SimNIBS, so you load the imaging data that you have and then it generates the mesh for you, since this program needs the mesh to perform brain stimulation simulations (you don't care about the simulation part, but only for the mesh). A direct tutorial reference for SimNIBS can be found here.