Voxel selection in SUMA

AFNI Message Board
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AFNI version info (afni -ver): Precompiled binary macos_10.12_local: Sep 18 2023 (Version AFNI_23.2.10 'Marcus Didius Severus Julianus')

Hello folks, I would like to hope all is well and that you will be back in full force soon.

I ran into a problem with SUMA selecting voxels on a rendered volume where values in the intensity sub-brick are much smaller , say between -0.1 and 0.1, than those in the threshold (stat) sub-brick, say (0 to 20). Let's also say that the vast majority of voxel intensities have a corresponding threshold that exceeds 1.5. If you set the threshold value to 1.5, SUMA correctly renders the whole volume but you cannot make any selections, unless you drop the threshold close to 0. That leads me to think that SUMA is incorrectly deciding on what is being available for selecting by applying the threshold to the values in the I sub-brick, rather than the T sub-brick.
Happy to discuss and illustrate if need be if the above is too confusing.

All the best,
Ziad

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Hi Ziad,

Thanks for the details, I believe this is (finally) fixed. If you build locally:

build_afni.py -build_root ~/afni_build -git_tag NONE

you should be able to run a build right now. Otherwise, we will hopefully run a new build tonight.
Thanks again,
-rick

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Hi Ziad,

In case you want actual binaries, the build just finished syncing to the server.

Thanks again,

-rick

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Rick, I have said it before and I will say it again, you Rock!

Cheers,
Z

2 Likes
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Glad we were able to resolve that, thanks!
-rick