Cornerstone is a set of JavaScript libraries that can be used to build web-based medical imaging applications. It provides a framework to build radiology applications such as the OHIF Viewer.
This library, @cornerstonejs/streaming-image-volume-loader, provides a volume loader which allows for individual image slices (e.g. part of an MRI or CT acquisition) to be streamed in to fill an entire volumetric array. During this slice-by-slice streaming, the user can continue to interact with the volume.
You can find the Cornerstone documentation on the website.