A MR prostate is a detailed, high-resolution imaging tests that tells you and your physician many details about your prostate cancer including its specific location within the prostate and pelvis and also whether there is evidence of the prostate cancer involving the seminal vesicles, nodes, and bone. A MR prostate is a detailed, high-resolution imaging tests that tells you and your physician many details about your prostate cancer including its specific location within the prostate and pelvis and also whether there is evidence of the prostate cancer involving the seminal vesicles, nodes, and bone.