Method used to produce a picture of internal body structures, often used in mesothelioma diagnosis. Some imaging methods used to detect cancer are x-rays, computed tomography (CT) scans, and magnetic resonance imaging (MRI).   A CT scan is a special radiographic technique that uses a computer to combine multiple X-ray images into a two dimensional cross-sectional image.   An MRI is a scan that uses magnetic fields, radio waves, and a computer to create images of selected areas of the body.   Back to Mesothelioma Glossary.