What is the major difference between ct and mri technology? how are the results different?

CT : Ct and MRI are complementary exams in many cases, which means that we can examine the same body area and get different "looks" to help us figure out what we are seeing. Ct uses ionizing radiation, while MRI uses magnetic fields to create images. (a physicist once reminded me that a magnetic field is also radiation, but the kind that people talk so much about, in relation to cancer potential, is the ionizing type.) example: when a kidney or liver mass is seen at ct, a radiologist might suggest that an MRI could help to further clarify (1) whether it is real, or (2) what it is. We don't always need an MRI to clarify a ct finding, just sometimes. That "sometimes" is determined by the radiologist, depending on how the abnormality looks at ct.

See below: CT is a three dimensional reconstruction of X-days and MRI essentially looks at the behavior of water within different tissues of the body to provide an anatomical picture. They have some widely different and some similar uses. Additional detail on your question would be helpful to focus an answer within the 400 characters provided.