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RadiAnt DICOM Viewer - Discussion Forum
Multi-frame files

Apr 13, 2022 10:36 PM
by Pseudoname
Hi, I've opened hundreds of CBCT scans with RadiAnt viewer (version 2021.2.2, 64-bit) without issue. They are all opened from .zip files so I haven't been paying attention if they were all multiple file sets (single-frame) or single file (multi-frame) but looking back, they all seem to be multiple file sets (single-frame).

Recently, a familiar provider exported the scans differently and sent me single file scans (multi-frame). When I open them, the "Multiplanar Reconstructions" and the "3D Volume Rendering" buttons are greyed out and nonfunctional.

Using the forum search function, I can see a post on Oct 1, 2017 saying "Improved VR/3D MPR support for multi-frame series". Is RadiAnt supposed to handle these multi-frame files? What might I need to do to get these to work?

Thanks, I have loved and used your product for years.
Apr 13, 2022 11:29 PM
by Pseudoname
I forgot to mention that with these multi-frame files, I can still scroll through the axial slices normally in the viewer. I just can't open the MPR or 3D VR windows.

Thanks again.
Apr 15, 2022 01:53 AM
by Pseudoname
I tried the just released beta (RadiAnt DICOM Viewer 2022.1 BETA #10100) with one of the multi-frame files. I experienced the same result with nonfunctional MPR and 3DVR buttons.
Apr 15, 2022 07:59 PM
by Pseudoname
I tried using the dcm4che tool emf2sf to split the multi-frame file but I got an error that the volume was the wrong media storage type. The Media Storage SOP Class UID is 1.2.840.10008.5.1.4.1.1.2 which is "CT Image Storage". The emf2sf tool is made for enhanced multi-frame files which if CT are Class: 1.2.840.10008.5.1.4.1.1.2.1 (Enhanced CT Image Storage).

I understand that multi-frame files have been around for many years before the "enhanced" classes were defined but does RadiAnt (and maybe dcm4che) expect an enhanced class to deal with a multi-frame file?

I also tried to split the multi-frame file with an old tool called dicom2 (2007) from Sebastien Barre which gave me an error "can not save a specific frame in a multiframe encapsulated/compressed stream".
May 24, 2022 03:55 PM
by RadiAnt
There is probably some spatial information missing in the DICOM file.
RadiAnt can only display 3D reconstructions when all required data is included in the DICOM file. You can copy the DICOM tags and send us via a contact form so that we can check it.
https://www.radiantviewer.com/contact/
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