I’m very new to 3D slicer, I just downloaded it to try get some 3D images for a case report but having some trouble.
Not sure if anyone has experience in using the St Jude’s OCT system (used in cardiology for imaging inside the coronary arteries, https://www.sjm.com/optis/index.html). This system can export a DICOM file which I’ve then tried loading into 3DSlicer however the ‘DICOM’ importer doesn’t work, when I examine the file it comes up with:
“Multi-frame image. If slice orientation or spacing is non-uniform then the image may be displayed incorrectly. Use with caution. Reference image in series does not contain geometry information. Please use caution.”
Using the Add Data widget allows the study to load but it doesn’t give a 3D image or allow editing. It does make a volume render which I’ve tried using the ‘Crop Volume’ module but this just crashed the program.
Anyone have any idea of what to do? I’ve posted a quick screenshot below.
The image looks good, it’s a 3D volume, as it shows up with significant extent in three orthogonal slice viewers.
Volume rendering and most editing operations are only supported for grayscale volumes, so you have to convert your color image to grayscale, using Vector to Scalar volume module.
It might be better to export your OCT as a grayscale (scalar) volume - you can then apply any colormaps after you load that into Slicer.
I can scroll through the 2d pictures and the orthogonal views work… I’ll
try make it grayscale and also upload a anonymous dicom to Dropbox, just
need to export again from work…
I managed to use the Vector to Scalar Volume module to make it grayscale but it still wouldn’t allow me to edit or 3D render… I tried to export this version but same thing. The workstation with the originals doesn’t have a grayscale export function…
3D rendering: Go to Volume Rendering module, select the scalar volume (output of the conversion step), then click the eye icon next to the volume selector. You’ll need to select a transfer function, for me MR-Default seems to work well with your data. Adjust with the Shift slider. If it’s slow, switch to VTK GPU Ray Casting.
Editing: What do you mean exactly? Segmenting out regions of interest? Go to Segment Editor and use the editor effects.
If you’d like to see the scalar volume similarly to the RGB image, go to Volumes module, choose the scalar volume, and select the lookup table called Inferno (or any other that you like).
Following up on this, I am trying to process some OCT data in the form of a series of 2D images, but am having little/no luck with volume rendering. These are already in grayscale and seem to show up fine in volume module, but I don’t know which knows to tweak to get a reasonable result.
Images: https://www.dropbox.com/sh/ce95fzhimgtrdgt/AABB2B7ISsy10lqKd9OeFPHha?dl=0
Currently Slicer does not support loading of color DICOM images. It would probably not too hard to add, but since color images are almost always screen captures that are not suitable for further analysis or processing, there hasn’t been enough motivation to dedicate time for that.
This DICOM image is a screen capture, too (8-bit, with some unknown color table, burnt-in annotations, etc.), so not usable for much. Instead of such derived image, the original data should be exported to DICOM, if possible. As a workaround, you can use ITK’s image reader by circumventing the DICOM module (just drag-and-dropping a single file to the Slicer application window).
