@jgk
if you have a choice, a higher tesla may help the doctor make a better analysis.
In terms of diffusion weighted MRI, I have read it picks up smaller molecules of potential cancer cells than other types of MRI's but it is worth a discussion with your doctor(s).
Attached is a list I found online of places that offer DWI in Cincinnati. Not sure of its accuracy.
In terms of medicare with supplement, mine picked up imaging, PSA and PSE testing, MyRisk genetic testing, Decipher test, consultations and radiation treatment. Give your healthcare provider a call to make sure.