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File-opening guide

How to open a Galileos .gwg file and its volume folder

For a Galileos Viewer examination, keep the .gwg file with its neighboring …_vol_0 folder and import the whole package in Ossidex on iPhone or iPad. The small companion file alone is not a substitute for the volume data.

By the Ossidex team · How we write and check these pages · Updated

Download on the App StoreFree to download · iPhone & iPad · iOS 17+

The Galileos volume package

What you haveWhat it means
.gwg fileKeep this part of the viewer package alongside the volume directory. Selecting it alone does not supply all volume files.
…_vol_0 folderThe neighboring Galileos volume data. The prefix varies; preserve the folder and everything inside.
Sidexis 4 Viewer 2D packageA different case. Do not infer Galileos-volume support merely from a Sidexis launcher on the disc.

How to open the images

  1. Locate the common parent directory. Find the folder containing both the .gwg file and the matching volume directory. Do not flatten or rename the contents.
  2. Transfer the complete package. Copy it to Files or compress the parent directory as ZIP. Keep the original copy until the import has been checked.
  3. Import the folder on iPhone or iPad. In Ossidex, tap +, then Folder. Select the copied folder containing the images, not just the launcher or index. If you received a ZIP, choose Files / ZIP instead. These are the English app labels.
  4. Use DICOM for the Mac browser route. Ask the clinic to export the reconstructed volume as DICOM, then choose Open folder in the browser viewer. Native Galileos import is not browser support for GWG.

What to check if it still does not open

The native disc-volume workflow preserves the available voxel size and display window, but the volume does not record patient orientation. Left/right labels are therefore absent, and its gray values should not be treated as calibrated Hounsfield units. Request an appropriately encoded DICOM export when those metadata are needed.

Large Galileos volumes can be reduced to fit device memory. The existing Sidexis guide documents the size threshold and reduction behavior; compare the imported volume with the original. Vendor implant plans, annotations and reports are not recreated as editable objects by opening the image volume.

Viewer options and format limits

On a Mac, open the browser viewer and choose Open folder for the complete DICOM folder or Open files for a ZIP. Browser format and memory limits differ from the iPhone/iPad app; a successful import does not establish that the examination is complete.

See the matching format or export guide and tested samples and compatibility limits. Ossidex is a viewer and planning aid, not a diagnostic device.

Frequently asked questions

Can I send only the .gwg file?

Send the full parent folder with the matching volume directory. A companion file by itself does not provide the complete examination.

Does every Sidexis disc contain this format?

No. Sidexis can also produce DICOM exports and 2D viewer packages. Identify the actual files before choosing an import route.

Sources

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