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MRI T2* scans for heart and liver iron in thalassaemia | CION Cancer Clinics
An MRI T2* scan measures iron in the heart and liver without a needle. On the heart, a result above 20 ms usually means no significant iron, 10 to 20 ms means mild to moderate iron, and below 10 ms means heavy iron needing prompt review. It finds what a ferritin blood test cannot, often years before symptoms. This page explains the numbers, the day of the scan and its limits. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What does an MRI T2* scan measure in thalassaemia?
- What do the T2* and liver iron numbers mean?
- What happens when you go for the scan?
- Why do you need the scan if ferritin is checked already?
- What do families often believe about this scan?
- What do the words on an MRI T2* report mean?
- Who is the scan not suitable for, and what can it not tell you?
- Common questions about MRI T2* in thalassaemia
The short answer
What does an MRI T2* scan measure in thalassaemia?
An MRI T2* scan measures how much iron has settled in the heart muscle and the liver, without a needle or a biopsy. On the heart, a T2* above 20 ms is usually read as no significant iron, and a value below 10 ms points to heavy iron that needs urgent attention.
Why the heart needs its own test
Every transfusion adds iron that the body cannot easily remove. Some of it settles in the heart. For years it can cause no symptoms at all, and then show up as breathlessness, an irregular heartbeat or a weak heart. A blood test for ferritin cannot see this. The MRI can, often years before any symptom appears.
How it works, in plain words
The MRI machine uses a strong magnet, not X-rays. Iron disturbs the magnetic signal from the tissue around it. The more iron there is, the faster the signal fades. T2* is the name for how quickly that fading happens, measured in milliseconds. So a shorter time means more iron. Special software turns the pictures into these numbers.
Scanner settings and software differ between centres. Your number is always read alongside your ferritin trend, symptoms and earlier scans.Reading your report
What do the T2* and liver iron numbers mean?
These are the bands most thalassaemia guidance uses. Your haematologist reads them with your whole history.
Result on the report
What it usually means
Heart T2* above 20 ms
No significant heart iron; the scan is usually repeated yearly
Heart T2* between 10 and 20 ms
Mild to moderate heart iron; chelation is usually reviewed
Heart T2* below 10 ms
Heavy heart iron; needs prompt review by the haematologist and often a heart specialist
Liver iron above 7 milligrams per gram
Iron load is higher than guidance aims for; chelation is usually reviewed
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Ask an oncologistOn the day
What happens when you go for the scan?
Before you go
There is usually no fasting and no injection. Bring earlier MRI reports and your ferritin results. Tell the centre about any metal in the body, a pacemaker or a fear of closed spaces.
Getting ready
You change out of clothes with metal and remove jewellery. Small stickers are placed on the chest so the machine can time the pictures with the heartbeat.
In the scanner
You lie on your back inside the tunnel. You will be asked to hold your breath for a few seconds several times. The machine is noisy, so you get ear protection.
The report
A radiologist trained in this method measures the images. The report goes to your haematologist, who explains what it means for your chelation.
Three different questions
Why do you need the scan if ferritin is checked already?
Each test answers a different question. None of them replaces the others.
Heart T2*
Shows iron inside the heart muscle. Heart iron can build up even when ferritin looks acceptable, and it is the most serious place for iron to collect.
Most useful when
- Chelation has been irregular
- Ferritin was very high in the past
- There is breathlessness or palpitations
Liver iron
Gives the liver iron concentration, which tracks total body iron more closely than ferritin. It is taken in the same visit, so there is no second trip.
Ferritin blood test
Cheap and quick, so it is repeated every few months to follow the trend. It rises with infection and liver problems, and it cannot say where the iron has gone.
Heart function tests
An echo or ECG shows how well the heart is pumping and beating. These often stay normal until iron is advanced, which is why the MRI is done before trouble starts.
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Commonly believed
What do families often believe about this scan?
"My child's heart echo is normal, so there is no heart iron."
An echo shows how the heart pumps, not how much iron it holds. The heart can keep pumping normally while iron builds up quietly. Only the T2* scan measures the iron itself.
"Any MRI centre can do this test."
T2* needs specific scanner settings, heart timing and validated software. A routine MRI of the chest does not give the number. Ask the centre directly whether they report cardiac T2* and liver iron concentration.
"The scan uses radiation, so it should be avoided in children."
MRI uses a magnet and radio waves, not X-rays. It can be repeated every year without the radiation concern of a CT scan. The main challenge in young children is lying still, not safety.
"A good T2* result means we can relax the chelation."
A good result usually means the current plan is working. Iron keeps arriving with every transfusion. Only your haematologist should decide whether anything changes.
On your report
What do the words on an MRI T2* report mean?
- Cardiac T2*
- The heart iron reading, in milliseconds. Higher is better; a lower number means more iron.
- LIC (liver iron concentration)
- The amount of iron in the liver, usually given as milligrams of iron per gram of dry liver tissue.
- R2*
- Another way of writing the same measurement. A higher R2* means more iron.
- Ejection fraction
- How much blood the main pumping chamber pushes out with each beat. It shows heart strength, not iron.
- Iron overload
- More iron stored than the body can safely hold, usually from repeated transfusions.
Being straight with you
Who is the scan not suitable for, and what can it not tell you?
The scan does not suit everyone. Some pacemakers and older metal implants make MRI unsafe. Very young children usually cannot hold still or hold their breath, and many centres wait until a child can manage without sedation. Guidance commonly suggests starting from around ten years of age, sometimes earlier.
What the result cannot tell you
It cannot tell you how long anyone will live or how the heart will do in future. It is a snapshot of iron on one day. It also cannot tell you which chelation medicine or dose is right. Never start, stop or change chelation because of a report you read at home. Take it to your haematologist.
Getting the scan from Hyderabad or the districts
Only some centres offer validated T2* reporting. CION does not perform this MRI in-house. CION's haematology team, led by Dr. Basudev Pokhrel, can review your reports, discuss the case at a tumour board and help you reach a centre that does the scan reliably. Ask any centre you are sent to whether they report both heart T2* and liver iron.
Questions we are asked
Common questions about MRI T2* in thalassaemia
My son's heart T2* is 14 ms. How worried should we be?
That falls in the mild to moderate band, so it needs attention but is not an emergency on its own. Your haematologist will look at ferritin, liver iron and how regularly chelation has been taken. They may change the plan and repeat the scan sooner. Do not alter the medicine yourself.
How often should the scan be repeated?
When results are normal, guidance usually suggests once a year. If heart or liver iron is raised, the team often repeats it sooner, commonly every six months, to see whether a change in chelation is working. Your haematologist sets the timing for your own situation.
Does my child need sedation?
Most centres avoid sedation for this scan, because the child needs to hold their breath on request. That is why scans usually start once a child can cooperate. Practising lying still at home and a visit to see the scanner first can help a nervous child.
Is there an injection or dye?
A standard T2* iron scan does not need contrast dye. Some centres add other heart pictures that do use dye, and they will tell you beforehand. If you have a kidney problem or a past reaction to dye, mention it when you book.
Can a normal ferritin replace the MRI?
No. Ferritin estimates iron across the whole body, and it can look acceptable while iron collects in the heart. The two tests are used together. Ferritin tracks the trend every few months, and the MRI checks the heart and liver directly, usually once a year.
What if the scan shows heavy heart iron but there are no symptoms?
That is exactly what the scan is meant to find. Heart iron is often silent until it is advanced. Your haematologist will usually review chelation promptly and may involve a heart specialist. If breathlessness, fainting or a racing heartbeat appears, go to the nearest emergency department.
Is the MRI T2* covered by schemes or insurance?
It depends on the scheme and the centre. Some state and central schemes, such as Aarogyasri, CGHS or PM-JAY, and some insurers cover imaging linked to thalassaemia care, but rules change. Check your current entitlement with the scheme or insurer before the scan, and ask the centre for a written estimate.
What should I carry to the review after the scan?
Carry the full MRI report, not just the summary line, and any earlier MRI reports. Add your ferritin results, the transfusion record and a list of all medicines. Write down missed chelation days honestly. It helps the team understand the number and plan the next step.
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Sources
- Thalassaemia International Federation — Guidelines for the Management of Transfusion Dependent Thalassaemia
- NHLBI — Thalassemia: Treatment
- NHS — Thalassaemia: Treatment
- NHS — MRI scan
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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