# open nrrd segmentation file in lungctanalyzer

**URL:** <https://discourse.slicer.org/t/open-nrrd-segmentation-file-in-lungctanalyzer/45828>\
**Category:** Support\
**Created:** [January 19, 2026, 4:44pm UTC](https://discourse.slicer.org/t/open-nrrd-segmentation-file-in-lungctanalyzer/45828 "2026-01-19T16:44:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Letizia\_Saviozzi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/letizia_saviozzi/32/81793_2.png) [@Letizia\_Saviozzi](https://discourse.slicer.org/u/Letizia_Saviozzi)\
**Post date:** [January 19, 2026, 4:44pm UTC](https://discourse.slicer.org/t/open-nrrd-segmentation-file-in-lungctanalyzer/45828/1 "2026-01-19T16:44:54Z")

</div>

I apologize in advance for my very bad computer knowledge.

Operating system: Windows 11, 64 bit  
Slicer version: 5.10.0  
Expected behavior: A year ago I save some scenes (Slicer version 5.6.2), leaving them open in the segmentation: the scenes were saved, on a USB, like 2 nnrd file (including the segmentation), one png file and one “link” direct to that Slicer version.  
Actual behavior: Now I need to re-compute the results with the Lung CT Analyzer, modifying the thresholds, but I can’t open these nrrd files. Every time I try Slicer announces an error like so:

“ Slicer has caught an application error, please save your work and restart. If you have a repeatable sequence of steps that causes this message, please report the issue following instructions available at [https://slicer.org](https://slicer.org)

The message detail is:

Exception thrown in event: D:\D\S\S-0-build\ITK\Modules\IO\NRRD\src\itkNrrdImageIO.cxx:769:

ITK ERROR: NrrdImageIO(000001AC463953B0): Read: Error reading C:/Users/Letizia/Desktop/TESI/scene segmetazione aperte/roggia/roggia cpap/Lung segmentation.seg.nrrd:

[nrrd] nrrdLoad: trouble reading “C:/Users/Letizia/Desktop/TESI/scene segmetazione aperte/roggia/roggia cpap/Lung segmentation.seg.nrrd”

[nrrd] nrrdRead: trouble[nrrd] \_nrrdRead: trouble reading NRRD file

[nrrd] \_nrrdFormatNRRD\_read:

[nrrd] \_nrrdEncodingGzip\_read: error reading from gzFile

[nrrd] \_nrrdGzRead: data read error

@rbumm