What is the difference between MRI and CT?

What is the difference between computed tomography and MRI? MRI and CT are completely different studies, except, in fact, for the very principle of tomography. Tomography is a layer-by-layer study of the patient’s anatomical zones with subsequent imaging of the object.

To make it easier for you to understand and not get confused in numerous technical characteristics and medical terms, we have combined the main data into a table.

MRI	CT
The principle of action
Magnetic resonance imaging obtains images without the use of X-rays. Contrary to popular belief, the patient does not receive a dose of radiation. The tomograph sends an electromagnetic pulse passing perpendicular to the magnetic field, the hydrogen atoms contained in the human body send a corresponding signal, which is captured by the device and transmits an image.	Computed tomography uses X-rays to obtain an image, but the radiation dose is minimal and safe for humans. The device is capable of scanning at different angles, thanks to the possibility of circular rotation around the entire patient’s body. The resulting images are subsequently processed by a computer program.
Research time
From 15 minutes to 2.5 hours	From a few seconds to 30 minutes
Preparation for research
The necessary procedures should be followed before the examination	No special training is required
Advantages
Absence of radiation No additional contrast is required for blood flow research Possibility of diagnosis in pregnant women	High research speed No special training is required High accuracy of diagnosis of bone structures
Indication
Diagnosis of diseases of the brain and spinal cord Late-stage strokes Diagnosis of diseases of the esophagus, trachea, aorta Diagnosis of diseases of the pelvis	Diagnosis of bone structures Injuries (internal bleeding is clearly visible) Strokes of the early stage Diagnosis of blood vessels, kidneys, organs of the chest, organs of the abdominal cavity
Absolute contraindications
Presence of a pacemaker Electronic implants of the inner ear The first three months of pregnancy The presence of various metal implants The presence of clips on vessels	Pregnancy Breast feeding