MRA vs MRI scan

So I’ve not been on here for a while. My symptoms have become “lively “. I am having a MRA scan in a couple of weeks .
I am not on any medication atm. My criteria for qualification for Ocrevus failed a few years ago due to no new lesions.
My question is will an MRA scan show new lesions. I’ve only ever had MRI scans.
I would love to know the difference of these two scans.
Thanks

I’m absolutely no medic but from a Quick Look on the web the two have similarities in terms of how they function but are used for different purposes. Have a look