My father is going through testing now. He's getting the ankle thing done - an ABI? - and an ultrasound. They hope not to have to do anything more invasive, like the dye test.
Oh, yes -- my Aunt had that done, too! I think it's called an Ankle-Brachial Index Test (ABI). Thankfully, from what I understand, it gives a lot of information to the doctor and isn't painful at all.