MRI vs CT Scan: Which One Do You Need?
Both MRI and CT produce detailed images of the body, but they work differently and excel at different things. Heres a side-by-side comparison from our radiology team.
The 30-second summary
CT is fast (5–10 minutes), uses X-rays, excellent for bone, lung, acute injury, and emergency situations. MRI takes 20–45 minutes, uses no radiation, far superior for brain, spinal cord, joints, soft tissue, and detecting tumours/inflammation.
When is CT preferred?
Trauma / accident, suspected stroke (initial workup), chest pain (rule out PE), kidney stones, lung nodules, acute abdomen, pre-surgery planning for bone procedures.
When is MRI preferred?
Brain tumours / MS / seizure workup, spine pain with neurological symptoms, ligament/cartilage injuries (knee, shoulder), pelvic and gynaecological assessment, soft-tissue tumours, characterising liver lesions found on ultrasound.
Cost and time comparison
CT Chest plain: ~₹2,500–4,000 (10 min). MRI Brain plain: ~₹4,500–7,000 (30 min). CT is faster and cheaper; MRI gives more detail for soft tissue. Your doctor will recommend the right one based on your symptoms.
Frequently asked questions
Does MRI have radiation?
No. MRI uses powerful magnets and radio waves — no ionising radiation at all. CT uses X-ray radiation, comparable to 200–400 chest X-rays for a single scan.
Which is better for cancer staging?
It depends on the cancer. PET-CT is the gold standard for most solid tumour staging. MRI is preferred for brain, pelvic, and liver-specific characterisation.
