Hello World!
MRI, CT Scan
& X-Ray —
What Do They Do?
Your doctor has asked for a scan. This guide explains — in simple words — what each test does, why it is done, and what to expect.
What is each scan?
Three different machines. Each one looks inside your body in a different way.
MRI Scan
Uses powerful magnets and radio waves — NOT radiation — to take very detailed pictures of the soft parts inside your body.
CT Scan
Takes many X-ray pictures from different angles and joins them into a 3D image. Very fast — used when time matters in an emergency.
X-Ray
The most common and oldest scan. Uses a small amount of radiation to take a flat picture — best for bones and the chest.
When does the doctor advise each scan?
Tap each scan to see the conditions it helps diagnose.
How are they different?
A simple side-by-side look at the most important points.
☢️ Radiation — How much is it really?
Understanding your report
Common words you may see in your scan report — explained simply.
MRI Report Words
These are two types of MRI pictures. T1 shows anatomy clearly. T2 shows swelling and fluid — it appears bright white.
A special setting that highlights damaged areas in the brain, like those caused by stroke or Multiple Sclerosis.
A safe dye (Gadolinium) injected into your vein. It makes active tumours or inflammation glow bright — helps the doctor spot them clearly.
A disc (cushion between spine bones) bulging and pressing on a nerve. This causes shooting pain, numbness or weakness in your arms or legs.
Simply means an abnormal area — could be infection, tumour, scar tissue, or old injury. Your doctor will explain what type it is.
Good news words — means nothing urgent or serious was seen on the scan at this time.
CT Scan Report Words
Fresh blood, calcium, or a dense structure — appears bright on CT. For example, fresh bleeding in the brain appears white.
Fluid, fat, or air — appears dark. Old stroke areas, cysts, and fat tissue appear dark on CT.
Hazy, misty patches in the lungs. Seen in COVID-19, early pneumonia, or other lung conditions. Needs further follow-up.
Swollen lymph nodes (glands). Can mean infection, inflammation, or in some cases, spread of cancer. Size and location matter.
A blockage inside a blood vessel — like a blood clot. Seen in Pulmonary Embolism (clot in lung arteries).
In medical reports this is GOOD — it means the organ looks completely normal. Do not worry when you see this word!
X-Ray Report Words
White hazy patches in the lungs — means fluid or infection (like pneumonia) is filling the air spaces.
Heart appears larger than normal on chest X-ray. May suggest heart failure or other heart condition — needs further tests.
Fluid collecting around the lung. Shows as a white haze at the bottom of the chest — can cause breathlessness.
A crack or break in a bone. Simple (clean break), comminuted (many pieces), or hairline (tiny crack). Location and type guide treatment.
Bones appear lighter (less white) than normal — reduced bone density. Common in older adults, especially women after menopause.
Everything looks normal for your age and condition. A reassuring finding.
How to prepare for your scan
Simple steps to follow before each test — so everything goes smoothly.
🧲 Before your MRI
Jewellery, rings, hairpins, hearing aids, dentures with metal, belt buckles — all must come off before entering the MRI room.
Pacemaker, cochlear implant, metal joint replacement, surgical clips — some are not safe near magnets. Always inform the technician.
Unless you are having an abdominal MRI or contrast dye injection — in that case, fast for 4 hours beforehand.
Tell your doctor before the day of scan. A mild relaxing medicine can be given, or an open MRI machine may be arranged.
MRI machines make loud thumping and banging sounds. Earplugs or headphones are always provided. You are completely safe.
🌀 Before your CT Scan
Eating before a contrast injection can cause nausea. Drink water freely unless told otherwise.
Helps your kidneys flush out the contrast dye quickly. Aim for 6–8 glasses on the day of the scan.
Iodine-based contrast can cause reactions in some people. If you have had a reaction to dye before, always tell the radiologist.
If you take Metformin, it should be paused 48 hours before and after contrast CT. Ask your doctor — this protects your kidneys.
CT uses radiation. If there is any chance of pregnancy, always tell the technician before the scan begins.
☢️ Before your X-Ray
Avoid clothes with metal zips, underwired bras, or buttons on the area being scanned. A gown may be provided.
Necklaces, earrings, or any metal near the scan area must be removed — they block the X-ray image.
Even slight movement blurs the picture. When the technician says "hold your breath" — breathe in and hold for just 2–3 seconds.
If you have past chest X-rays or bone X-rays, bring them. The doctor can compare old and new pictures to spot any changes.
A lead shield will be placed over your abdomen to protect the baby. Always inform staff before the scan.
⚠️ Important for Everyone
Always bring a doctor's prescription — scans should not be done on your own. The right scan is chosen based on your full medical history.
Share your full medicine list with the radiology team — some medicines interact with contrast dye.
Ask questions freely — you have every right to understand why a scan was ordered, how it works, and what it might find.
Keep digital copies of reports on your phone. In any emergency, having past reports instantly available can save valuable time.
Always discuss results with your doctor — never interpret scan reports alone. Words like "lesion" or "opacity" need a doctor's full clinical context.