Possible Y-axis flip in report of correlational tractography

[Tom Le Tutour]

Dear Professor Yeh,  

Thank you very much for the great tool that is DSI studio. I have just finished a correlational tractography analysis and found something strange while examining the report. Tracts negatively associated (shown in blue) seem aligned with the pial surface but seem "flipped" when overlaid on the volume slices. I'm only noticing it on the cerebellum because it is the most flagrant, but I suspect all tracts are flipped when overlaid on a volume. Is this a bug, constructor y-axis differences, or have I misconfigured something ? 

Best regards, 

Tom LE TUTOUR

[Frank Yeh]

Thank you for reporting this issue. Could you let me know the version date of the DSI Studio you are using?
Sorry about the bug; I'm looking into it.

Best regards,

Frank

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[Tom Le Tutour]

Dear Frank, 

According to what I see in the console, I am using the Hou "侯" version (Feb 12 2026, http://dsi-studio.labsolver.org). I am using Windows 11.

PS: I also think it's affecting this type of graph 

[Tom Le Tutour]

Sorry for the double message, 

I've just re-ran this correlational analysis on a different computer (Windows 10) with a different build (version: Hou "侯" Sep 17 2025, with cuda enabled) and the tracts appear properly aligned with the volume now. The bug has to have been introduced between those two releases.

Best regards, 

Tom

[Frank Yeh]

Thank you for reporting this issue.

I fixed this visualization bug, and the new build will be ready in one
hour (two hours for Mac).
Please update DSI Studio and see if it works.

Thank you and sorry for the hassle.
Frank

On Wed, Feb 18, 2026 at 6:25 AM Tom Le Tutour <tletut...@gmail.com> wrote:
>
> Sorry for the double message,
> I've just re-ran this correlational analysis on a different computer (Windows 10) with a different build (version: Hou "侯" Sep 17 2025, with cuda enabled) and the tracts appear properly aligned with the volume now. The bug has to have been introduced between those two releases.
>

> Best regards,
> Tom
>
> On Tuesday, February 17, 2026 at 6:27:54 PM UTC+1 Frank Yeh wrote:
>>
>> Thank you for reporting this issue. Could you let me know the version date of the DSI Studio you are using?
>> Sorry about the bug; I'm looking into it.
>>
>> Best regards,
>> Frank
>>
>> On Tue, Feb 17, 2026 at 12:25 PM Tom Le Tutour <tletut...@gmail.com> wrote:
>>>
>>> Dear Professor Yeh,
>>> Thank you very much for the great tool that is DSI studio. I have just finished a correlational tractography analysis and found something strange while examining the report. Tracts negatively associated (shown in blue) seem aligned with the pial surface but seem "flipped" when overlaid on the volume slices. I'm only noticing it on the cerebellum because it is the most flagrant, but I suspect all tracts are flipped when overlaid on a volume. Is this a bug, constructor y-axis differences, or have I misconfigured something ?
>>> Best regards,
>>> Tom LE TUTOUR
>>>

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>>> You received this message because you are subscribed to the Google Groups "DSI Studio" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an email to dsi-studio+...@googlegroups.com.
>>> To view this discussion visit https://groups.google.com/d/msgid/dsi-studio/f0f2770a-2d1a-4ed8-91d1-36226d95f961n%40googlegroups.com.
>
> --
> You received this message because you are subscribed to the Google Groups "DSI Studio" group.
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> To view this discussion visit https://groups.google.com/d/msgid/dsi-studio/2074e89c-d244-4aac-bc42-7dfaaf08f2acn%40googlegroups.com.

[Tom Le Tutour]

Dear Frank, 

The bug seems fixed on my end using the Feb. 18 2026 build. It was no hassle at all, thank you very much for the bug fix!

Best regards,

Tom