Requesting datasets for my research

Hello to my wonderful AI fellows, I am an undergraduate in my senior year with my degree being in system and biomedical engineering. My graduation project is in medical image segmentation for the liver, and it’s vessels/lobes using deep learning. We are now in the initial data acquisition phase, so my request if anyone can point me to an open source for that or even if they know a medical organization that are willing to help us if we sent them an official proposal to aid with our research of course, our research will be open source to give back a fraction of what the AI community gave us

PS: by we, I mean my team of four members
PS: in my search I found the lits-17 dataset, the Medical Segmentation Decathlon dataset, the chaos dataset, the silver07 dataset, all of these are competitions in AI datasets