The main difference between CT and MRI is the technology used to scan the patient:

CT uses radiation to produce cross-section images with the help of computer processing. CT images are more detailed than standard x-ray images and can show organs, soft tissue and bone.

MRI images the water molecules in the body through the use of an extremely strong magnetic field and produces a very detailed image. An MRI scan can be used to image almost any part of the body.

CT scans are usually much quicker than MRI scans. A typical CT scan may last 5 – 10 minutes whereas an MRI can be 30 minutes or more.

MRI offers clearer imaging of soft tissue structures and is often preferred for the diagnosis of neurological conditions and spinal or CNS problems.

A CT scan is less noisy than an MRI scan.

If a CT scan is inconclusive, patients will often need an MRI scan which will produce more detail.