When do they use CT scan and when MRI?

CT scans are typically used for quick assessments of trauma, detecting internal bleeding, and visualizing bone injuries due to their speed and ability to capture detailed images of dense structures. MRI, on the other hand, is preferred for soft tissue evaluation, such as examining the brain, spinal cord, muscles, and ligaments, because it provides superior contrast for these tissues. Each modality has its specific indications based on the condition being investigated, patient safety considerations, and the required detail of imaging.