What are the differences between CT scan and MRI?

Technology

CT uses X-rays to create detailed images of the body's internal structures. It takes multiple X-ray images from different angles and uses computer processing to create cross-sectional images (slices).

MRI uses strong magnets and radiofrequency waves to produce detailed images of organs and tissues. It does not involve ionizing radiation.

Imaging Detail

CT is particularly good for imaging bones, internal organs, bowels, lungs and also detecting bleeding. It provides excellent detail for acute injuries and conditions.

MRI is better for soft tissues, such as the brain, muscles, ligaments and tendons. It provides high contrast images, making it ideal for neurological and musculoskeletal imaging.

Speed

CT scans are generally faster, often completed in a matter of minutes.

MRI scans typically take longer, often 30 minutes to an hour, depending on the body part imaged, due to the need for detailed imaging and multiple sequences required.

Safety

CT involves exposure to radiation, which poses a small risk, especially with repeated scans.

MRI is generally considered safe and does not use radiation, but it is not suitable for patients with certain implants (e.g cardiac pacemakers) due to the magnetic field.

Cost

CT scans tend to be less expensive than MRI scans, though costs can vary based on location and specific circumstances.