What is the the diffrence between MRI and CT Scan

A CT Scan (or CAT Scan) and an MRI operate differently and are better suited for alternative types of diagnoses. 

An MRI suited for researching soft tissue, ( ligament and tendon injury, spinal cord injury, brain tumors etc.) while a CT scan is better suited for cartilage injuries, lung and chest imaging, and detecting cancers. CT scans are widely used in emergency rooms because the steps involved takes less than 5 minutes. An MRI, on the other hand, can take up to 30 minutes.

An MRI typically costs more than a CT scan. One advantage of an MRI is that it does not use radiation while CAT scans do. This radiation is harmful if there's repeated exposure.