What does "CT scan" stand for and when is it preferred over MRI?

CT stands for computed tomography, a diagnostic imaging method that uses X-rays taken from multiple angles and computer processing to create cross-sectional images of the body. CT is preferred over MRI for acute trauma evaluation because it is faster, for detecting bone fractures with high detail, for chest and abdominal emergencies, for detecting acute bleeding, and for patients who cannot undergo MRI due to metallic implants or claustrophobia. CT with contrast dye enhances visualization of blood vessels and organs.