Which test is used to check for a mass on an organ, a cat scan or an MRI

Which test is used to check for a mass on an organ, a cat scan or…?

http://www.chacha.com/question/which-test-is-used-to-check-for-a-mass-on-an-organ%2C-a-cat-scan-or-an-mri

MRI provides much greater contrast between the different soft tissues of the body than computed tomography (CT) does, making it especially useful in neurological (brain), musculoskeletal, cardiovascular, and oncological (cancer) imaging. Ch…