implement additional features of cornerstone3D

[koebel]

In addition to the features of the current dicom viewer extension implementation, cornerstone3D would also support the preview of series of images, rendering volumes thereof and editing files (annotating & segmenting data) as well as saving these modifications. However we don't see a benefit of implementing these functionalities for the envisioned use cases at the moment.

If a use case with these functionalities becomes relevant in the future, the following tasks would result:

• displaying stack of images (multiple files belonging to a series)
• rendering volumes of a series of files
• advanced image manipulation tools
• annotation tools
• segmentation tools