Can you try ‘-dsold’ in FS8.0.0 instead? It should behave the same as ‘-ds’ in FS7.4.1

Yujing

From: Óscar Peña-Nogales <opennog@gmail.com>
Sent: Monday, July 7, 2025 7:27 AM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] mri_convert error: Floating point exception (core dumped)

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Dear, 

I'm attempting to increase the resolution of an image but I get the following error when I run the mri_convert command: 

Command: 

mri_convert -rt nearest -it nii -i XX.nii.gz -ds 0.2 0.2 0.2 -ot nii -o XX_sr_temp.nii.gz

Log:
reading from XX.nii.gz...
TR=10.01, TE=4.75, TI=0.00, flip angle=50.00
i_ras = (-0.99768, -0.0561452, 0.0384932)
j_ras = (0.0571764, -0.998019, 0.026235)
k_ras = (0.036944, 0.0283751, 0.998914)
DownsampleFactor = 0.200000, 0.200000, 0.200000

Error:

Floating point exception (core dumped)

I was not able to find any similar error on the mailing list. Does anyone have any thoughts on how to trouble-shoot this one?

More info:

1) FreeSurfer version: freesurfer-linux-ubuntu22_x86_64-8.0.0-20250204-0f2bd3a
2) Platform: 
Distributor ID: Ubuntu
Description: Ubuntu 22.04.5 LTS
Release: 22.04
Codename: jammy

3) uname -a: Linux eec78b7407cc 6.8.0-60-generic #63~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Apr 22 19:00:15 UTC 2 x86_64 x86_64 x86_64 GNU/Linu

Note1: I also tried with FreeSurfer 7.4.1, and the command, with the same input data, works in that version. Nevertheless, I wanted to update to 8.0.0.

Note2: The same command does work on 8.0.0 when -ds >1

Thanks in advance.

Óscar