MRI vs. CT scan: What’s the difference?

You’ve been told you need a scan. Now what? Should you be booking an MRI scan in Griffith or a CT scan instead? And what’s the actual difference between the two?

If you’re feeling unsure, you’re not alone. Many people wonder which scan is better for their condition, whether there’s radiation involved, or if bulk billing is available. Let’s break it down clearly so you can confidently walk into your appointment.

What is a CT scan?

A CT scan (Computed Tomography) is a type of imaging that uses X-rays to create detailed cross-sectional images of your body. It’s fast, efficient, and excellent for detecting injuries and internal issues.

When is a CT scan used?

A doctor might send you for a CT scan if you need:

• Fracture or injury assessment – Great for diagnosing broken bones and joint issues.
• Brain scans – Detects strokes, bleeding, or trauma.
• Lung and abdominal imaging – Often used for detecting pneumonia, appendicitis, and other internal conditions.
• Cancer screening – CT scans are commonly used to check for tumours.

Most CT scans take just 5–10 minutes, making them one of the quickest and easiest imaging procedures available.

For more details, read our guide to Understanding CT scans.

What is an MRI scan?

An MRI scan (Magnetic Resonance Imaging) uses powerful magnetic fields and radio waves to generate incredibly detailed images of soft tissues. Unlike a CT scan, it doesn’t use radiation, making it a preferred choice for imaging the brain, muscles, and ligaments.

When is an MRI scan used?

Your doctor may recommend an MRI if you need:

• Brain and spinal imaging – Best for detecting tumours, nerve damage, and multiple sclerosis.
• Joint and muscle assessment – Essential for ligament tears, cartilage damage, or chronic pain.
• Soft tissue and organ scans – Provide a more detailed view of organs than a CT scan.

However, MRI scans take longer—usually between 30–60 minutes—and requires you to lie very still inside a tunnel-like machine.

For more details, read our guide to your medical imaging options.

MRI vs. CT scan: which one do you need?

CT scan is usually best for:

• Bone fractures and injuries
• Lung and chest conditions
• Abdominal pain or internal bleeding
• Emergencies (CT is much faster than MRI)

MRI scan is usually best for:

• Brain, spine, and nerve conditions
• Soft tissue and ligament injuries
• Tumour detection (especially in the brain or soft tissues)
• Long-term monitoring of conditions like multiple sclerosis.

If your doctor has given you a choice, MRI tends to provide more detailed images but takes longer, while CT is faster and better for bones and emergencies.

Safety and comfort: What to expect

Radiation exposure

CT scans use low doses of X-ray radiation, but they’re considered safe and are widely used in medicine. MRI scans, on the other hand, don’t use radiation at all—making them the preferred option for younger patients and long-term monitoring.

Claustrophobia concerns

MRI scans involve lying in an enclosed tube for an extended period. If this makes you anxious, talk to your doctor—some clinics offer wider, more open MRI machines, or you may be given mild sedation to help you relax.

Contrast dye

MRI and CT scans may require a contrast dye to highlight certain body areas. If you have kidney issues or allergies, let your doctor know before your scan.

Bulk billing and costs

Worried about scan costs? Medicare covers many CT and MRI scans when referred by a GP or specialist, but eligibility depends on your condition.

At Xplore Radiology, we offer bulk billing for eligible patients on specific scans. When booking, always check with our team to see if your scan is covered.

How to prepare for your scan

For a CT scan

• If contrast dye is required, you may need to fast for a few hours
• Wear loose, comfortable clothing with no metal zippers or buttons.
• The scan is quick—usually under 10 minutes.

For an MRI scan

• You must remove all metal objects, including jewellery, piercings, and some makeup (which may contain metal particles).
• If you’re claustrophobic, let your technician know before the scan.
• The scan takes longer, ask if music is available to help you relax.

FAQs about MRI and CT scans

Making the right choice

MRI and CT scans are powerful diagnostic tools—your doctor will recommend the one best suited to your needs. If you’re in Griffith and need an MRI scan or are looking for CT local services, Xplore Radiology provides expert imaging with state-of-the-art technology.

Book your scan today

Need a CT scan or MRI scan in Griffith? Contact Xplore Radiology to book an appointment and check bulk billing eligibility.

Book your scan now