[Simnibs-discuss] MagVenture_MC_B70.nii.gz missing from SimNIBS 4?

[Kristoffer Madsen]

Indeed we did remove the file on purpose mainly just for reducing the
size of the distribution. The comment regarding preferring .nii.gz
over .ccd files is somewhat outdated. You will still obtain faster
stimulations using the .nii.gz files, however the result should be the
same (or rather extremely similar). The .nii.gz is actually generated
based on the .ccd file and you can basically recreate the .nii.gz file
by running the simnibs command "ccd2nifti -i
legacy_and_other/MagVenture_MC_B70.ccd" I think this file should be
the same as the old one except for potential numerical precision which
may differ slightly across platforms and operating systems. If you
need to "exactly" reproduce the .nii.gz coil you can just use the old
file if you like.

I hope this answer is sufficient to address your question, otherwise
let me know, Best,
Kristoffer

On Wed, 8 Feb 2023 at 16:53, Sean McBride <sean at rogue-research.com> wrote:
>
> Hi all,
>
> In my SimNIBS 3.2.5 installation, there are the following files (with md5 checksum):
>
> ccd-files/Magstim_70mm_Fig8.ccd) = 7054f818a041612c613e8c5ad73a37ec
> ccd-files/Magstim_70mm_Fig8.nii.gz) = fc3cbf340b2d7e68e67ecb52a2e7b110
> ccd-files/MagVenture_MC_B70.ccd) = ad5597208f6c3d1a301efa2267f4cf73
> ccd-files/MagVenture_MC_B70.nii.gz) = 4159ab1bef77ecc2f2cece25d909be0a
>
> In my 4.0 installation, there are:
>
> legacy_and_other/Magstim_70mm_Fig8.ccd) = 7054f818a041612c613e8c5ad73a37ec
> legacy_and_other/Magstim_70mm_Fig8.nii.gz) = fc3cbf340b2d7e68e67ecb52a2e7b110
> legacy_and_other/MagVenture_MC_B70.ccd) = ad5597208f6c3d1a301efa2267f4cf73
>
> It looks like MagVenture_MC_B70.nii.gz is missing. Was it removed deliberately? The docs say that the .nii.gz files should be preferred over the .ccd files [1], so I find this suspicious. I appreciate that it's "legacy", but still...
>
> [1] https://simnibs.github.io/simnibs/build/html/documentation/sim_struct/tmslist.html
>
> Thanks,
>
> Sean
>
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