CT scan vs MRI scan – What’s the difference?

Difference between MRI and CT scans

In this blog, we explore the difference between an MRI and a CT scan. The aim is to help you understand why your doctor has recommended it, what they are used for and how they work.

Diagnostic imaging plays a crucial role in locating the source of a medical problem along with providing the information needed to help diagnose a wide variety of conditions.

What is the difference between an MRI and a CT scan?

Both MRIs and CT scans are medical imaging methods that are used to create images of the internal body to help diagnose a range of different medical conditions.

The main difference between these two diagnostic imaging techniques is that an MRI uses strong magnetic fields to take images, while a CT scan uses x-rays.

What do MRI and CT scans show?

Both MRI and CT scans show a detailed view of different parts of your body. MRI scans are generally considered as providing more accurate imagery and are therefore used for diagnosing conditions associated with your bones, organs or joints. CT scans are often used to identify any bone fractures, tumours, or internal bleeding.

Reasons for getting an MRI scan could include:

• torn ligaments
• soft tissue problems
• spinal problems
• nerve issues
• inflammation.

Reasons to have a CT scan include:

• emergency diagnoses e.g. strokes
• fractured bones
• joint issues
• blood clots
• injuries to internal organs
• internal bleeding
• tumours
• cancer development.

What can a CT scan show that an MRI cannot?

CT scans are often used in emergency situations as they produce faster results. This enables doctors to provide faster diagnosis and treatment. For example, CT scans can be used when looking at blood vessels to diagnose the cause of a stroke.

CT scan vs MRI – the costs

MRI scans typically cost more than CT scans and produce more detailed images.
A full breakdown of private MRI scans at Practice Plus Group is available above.

Please note that CT scans are not available at Practice Plus Group.

CT vs MRI – the procedure

The process for both procedures is similar: you will be asked to lie down on a bed that will then slowly and automatically slide into the circular scanner. This table will move up and down to produce images of different parts of your body. The radiographer will leave the room once you are in the scanner, but you will be able to communicate with them through an intercom.

You will need to stay as still as you can to ensure accurate pictures are taken. You may be asked to hold your breath during the scan.

The main difference between the two procedures is that a CT scan is much quieter than an MRI. MRI scans are noisy and to manage this, you will be given earplugs and headphones to listen to relaxing music during your scan.

An MRI scan might take around an hour to complete, whereas a CT scan can take as little as ten minutes.

Pros and cons of CT scans vs MRI

When deciding between a CT scan and an MRI, physicians weigh several critical factors, ranging from speed and cost to the specific type of tissue being examined and exposure to radiation. While both imaging techniques offer invaluable diagnostic insights, they use fundamentally different technologies and serve distinct clinical needs. While both procedures are considered to be very safe, there are some disadvantages to consider. Below is a breakdown of the key pros and cons for each to help compare their strengths and limitations:

Which is better: MRI or CT scans?

It isn’t a question of one method being better than the other, but more: which method is better suited to your specific needs. The right procedure for you will depend on the area of the body or the type of issue you are trying to diagnose or pinpoint.

For example, if your doctor thinks you might have fractured your arm – a CT scan might be a better option. Whereas, if you have a problem with your spine, or an issue which is harder to diagnose, a more detailed MRI scan might be necessary. In emergency situations, a CT scan might be chosen as it provides faster results.

Risk factors also play a part in which method is offered. For example, those with metallic implants may not be suitable candidates for an MRI. Your doctor will be able to advise on the right scan for you.

Please note that CT scans are not available at Practice Plus Group.

Choose the right treatment for you

We understand how important it is to get the right diagnosis as quickly and easily as possible. Diagnostic imaging can provide the information radiologists and doctors need to find the source of your pain and start treatment.

Here at Practice Plus Group, we offer personalised diagnostic procedures with short waiting times and excellent quality of care.