It's one of the most common questions we hear: "My GP mentioned a scan — do I need an MRI?" The honest answer is that it depends on what your body is being investigated for. MRI, CT and ultrasound each have their strengths, and choosing the right one from the start saves both time and money.
What MRI does best
MRI (magnetic resonance imaging) uses magnetic fields and radio waves — no radiation. It produces exceptional detail of soft tissues: muscles, ligaments, tendons, cartilage, discs, and organs like the brain, spine and heart.
- Best for: back and neck pain, joint injuries, neurological symptoms, cardiac assessment, prostate and breast screening
- Not ideal for: bone fractures (X-ray is better) or patients who cannot lie still for 20–40 minutes
- At Northwest Health, MRI starts at £400 for one area, with every scan reported by a consultant radiologist
What CT does best
CT (computed tomography) uses X-rays taken from multiple angles to build a 3D image. It's fast, works well for bony structures, and is often used in emergency settings.
- Best for: suspected fractures, lung and chest conditions, abdominal investigations, vascular assessments
- Bear in mind: CT involves ionising radiation, so it isn't typically the first choice for younger patients or when repeat imaging is likely
- Private CT is widely available but Northwest Health currently focuses on MRI and ultrasound for planned investigations
What ultrasound does best
Ultrasound uses sound waves to create real-time images. It's safe, quick and particularly valuable for guided procedures.
- Best for: tendons, muscles and soft tissue near the surface; abdominal organs; guided injections into a precise target
- Particularly useful in physiotherapy: at Northwest Health, our physiotherapists use diagnostic ultrasound and can perform ultrasound-guided injections from £200
- Results are immediate, and there's no radiation or confined space
How do you choose?
In practice, the scan you need is usually determined by:
- The body part — soft tissue and joints lean towards MRI or ultrasound; bones and chest lean towards CT or X-ray
- The clinical question — a broad "what's going on?" often suits MRI; a specific guided treatment suits ultrasound
- Your history — metal implants, previous contrast reactions or claustrophobia affect which scan is safest for you
That's exactly why every scan at Northwest Health begins with a GP pre-test review — no referral needed — to confirm the right test before you book. You won't pay for a scan that doesn't answer your question.
Do I need a referral?
No. You can contact us directly and our GP will guide you towards the most appropriate investigation for your symptoms.
Speak to our team
Book a consultation and we'll build a plan around you. Most enquiries answered the same day.