Radiopaedia is a well-known source for radiology imaging studies, allowing free downloading of those images one by one, but the best way to view CT &/or MRI studies is via stack images.
The request: a userscript of a button to bulk-download stack radiology images by study.
I know nothing about userscripts in general, but I know there is a userscript on this site that used to work but unfortunately stopped working and hasn't been updated for a couple of years (& not sure it's right someone else to update it). It's called Radiopaedia Stack Downloader, made by CryptalEquine.