MRI, or magnetic resonance imaging, is an imaging test that gives a more detailed picture of the inside of the body. The MRI image of the prostate provides a more detailed view of the prostate gland than a traditional ultrasound image and allows doctors to see abnormal areas of the prostate that should be sampled with a biopsy. Typically, MRIs are used to visualize the prostate gland in men with known prostate cancer or men who have had a prior prostate biopsy with an increasing PSA.