Stacks are a set of sequential images that can be scrolled. Sequential images from cross-sectional modalities (e.g. CT/MRI) or time-resolved modalities (e.g. DSA) and should be presented as a scrollable stack, rather than as multiple single images.

Number of images

Stacks should ideally contain less than 100 images per stack. If you upload very large stacks not only is this unnecessary (very few teaching cases require thin slices) but it may make your case difficult to view for visitors who have slower connections. 

If you only have thins, then select every second or third image to keep the overall number of images down. 

Uploading stacks

There are two ways of uploading stacks: automatic and manual.


To upload cases from DICOM/PACS as stacks to Radiopaedia, please use one of our uploaders. This is by far the easiest way of creating great cases.


If you are not in a position to use one of our uploaders, then you can definitely manually upload stacks. In fact, the vast majority of the cases on Radiopaedia have been manually created.  All you need to do is:

  1. zip sequentially numbered images for each stack
  2. upload the zip file in exactly the same way you would upload a single image
  3. use the list box under each stack to specify the appropriate plane/projection and sequence/contrast phase
How to create a zip file
  • MacOS: highlight images, right click and select 'compress'
  • Windows: highlight images, right click and 'send to compressed (zipped) folder'

Make sure the images are sequentially numbered, preferably with leading zeros (although this is not mandatory) as follows:


It is worth keeping in mind that the middle image within a stack is used as the thumbnail image by default and that often, this will not be a good representation of the pathology. Therefore, it is often helpful to select a specific different key image.

Help and Style Guide

Article information

rID: 7573
Tag: help
Synonyms or Alternate Spellings:
  • Image stacks
  • Stack

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Cases and figures

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