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RadiAnt DICOM Viewer - Discussion Forum
3D MPR Does not load full volume (2022.1)

Nov 4, 2022 10:38 AM
by BChance
Hello,

I have a 150 slice thoracic volume, of which all of the slices are consistently visible in the slice-by-slice viewer.

My issue is in the Multiplanar Reconstruction or 3D Rendering of this volume. The in-built functions for this only use the first 100 slices of the volume, leaving the inferior third of the thorax from the reconstruction.

I have used these functions many times with other DICOM filesets, and this issue has only ever occurred before when loading multiple reconstructions of larger (data-wise) volumes simultaneously (I presume this is RAM-based), but occurs here in the absence of additional processing requirements.

In attempts to identify/solve the problem, I have isolated the volume of interest and tried loading only this before creating reconstructions, with no luck. I have also looked at the metadata of all of the files in this volume, which all seems to be consistent to that of a normal, functioning volume.

I have looked at other discussions on the forum and could not find any with the same issue. Apologies if I have missed one.

Any help appreciated
Nov 5, 2022 06:07 PM
by boskar
It happened for me with Head CT in axial volumes made with variable slice thickness/spacing.

I bet that the spacing between slices in Your dataset is not equal to others somewhere where the volume breaks.

Nov 7, 2022 11:08 AM
by BChance
Hi boskar,

I presumed the same originally, so made a code to compare the metadata between individual slices and highlight the differences - they were all consistent with one another, and variable data showed consistent intervals between slices.

The fileset seems to have a very irregular naming system with relation to series and instance number, so I have been considering this as another potential cause. Unfortunately I'm not that great with computers so can't predict the mechanics behind this.

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