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Interventional radiology

Who Performs an — Image-Guided Biopsy?

Many families are surprised to learn that a radiologist — not a surgeon — does this procedure. The scanner is not an add-on to the biopsy. It is how the doctor navigates to the right spot without making an incision.

Medically reviewed by Dr. Mohammed Imaduddin, Surgical Oncologist, MBBS · MS (General Surgery) · M.Ch (Surgical Oncology) · Last reviewed September 2026

  • A specialist doctor — An interventional radiologist leads the procedure — a doctor trained in both imaging and needle techniques.
  • The scanner is the technique — Imaging guidance is what makes reaching a deep tumour safely possible without surgery.
  • A small team around you — A radiographer or sonographer operates the scanner; a nurse monitors you throughout.
  • Experience is worth asking about — Procedural volume at a centre is a reasonable thing to ask before you book.
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An interventional radiologist performs your image-guided biopsy. This is a specialist doctor trained in both reading scans and using them in real time to guide a needle precisely. They are not a surgeon. The scanner is not a separate step — it is how the needle reaches the right spot safely.

What happens from your referral to the biopsy, step by step?

  1. Referral

    Your oncologist or physician refers you to an interventional radiologist, along with your existing scans and a clinical summary of what they are looking for.

  2. Pre-procedure review

    The interventional radiologist reviews your imaging to decide which scanner to use, the safest needle path, and whether you need any preparation such as fasting or pausing a medication.

  3. Day of the procedure

    A nurse checks your medications and allergies. The radiographer or sonographer sets up the scanner. The radiologist confirms the approach with a quick scan before starting.

  4. The needle passes

    The radiologist uses real-time imaging — usually ultrasound or CT — to guide the needle to the exact target. You are awake. Local anaesthetic means the main sensation is pressure.

  5. Sample dispatch

    The tissue samples are sealed, labelled and sent immediately to the pathology laboratory, where a pathologist examines them under a microscope and writes the report your oncologist acts on.

Why is a radiologist doing this, not a surgeon?

Interventional radiologists are trained in both interpreting scans and using imaging in real time to guide instruments inside the body. The two skills are not separate — each procedure requires both at once.

The scanner is not an add-on to the needle technique. Without imaging to show the needle's position at every moment, reaching a tumour deep in the chest, liver or pelvis safely would require open surgery.

For some accessible sites — a breast lump you can feel, or a lymph node in the neck — a surgical oncologist or breast surgeon may perform the biopsy, with or without ultrasound guidance. For anything deep inside the body, interventional radiology is the specialty this requires.

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Who else is in the room during your biopsy?

Interventional radiologist
The doctor leading the procedure. They decide the needle path, insert the needle, and take the tissue samples under imaging guidance.
Radiographer or sonographer
The trained technologist who operates the CT scanner or ultrasound machine during the procedure, following the radiologist's direction.
Procedure nurse
Prepares the sterile equipment, monitors your pulse and comfort throughout, and stays with you from start to finish.
Pathologist
Not present during the biopsy, but the specialist in the laboratory who analyses your tissue and writes the report that your oncologist uses to plan treatment.

Does the radiologist's experience matter, and what should you ask?

Procedural volume matters in any specialty that involves manual technique. A radiologist who does biopsies regularly across a range of tumour sites encounters the variations — difficult positions, small targets, complex anatomy — that build practical skill. CIRSE, the European body for interventional radiology, includes operator experience as a factor in procedural outcomes.

You can ask how many image-guided biopsies this centre performs each year, and whether the radiologist assigned to you does them regularly. You can also ask whether the centre checks that the sample is adequate before the needle is withdrawn — a step called rapid on-site evaluation — which reduces the chance of needing a repeat procedure.

These are reasonable questions at any centre, and a team confident in their volume will answer them directly.

Did you know?

If your biopsy is CT-guided, the radiation dose you receive is broadly comparable to that of a standard diagnostic CT scan of the same body region — not a meaningfully higher exposure than the scan alone.

The benefit — safe access to a tumour that would otherwise require surgery — is why the dose is considered acceptable when the procedure is indicated.

Source: IAEA Radiation Protection of Patients programme; NCCN Clinical Practice Guidelines in Oncology

Explore 62 more Biopsy Techniques and How They Compare topics

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Common questions

Frequently asked questions

Is an interventional radiologist the same as a radiologist?

No, though both are qualified doctors. A diagnostic radiologist reads your scans and writes the report; an interventional radiologist uses imaging in real time to guide procedures with needles, wires and other instruments. Both complete medical training and then specialise further in radiology — the interventional subspecialty adds procedural training on top of diagnostic skills. The doctor doing your biopsy will have both.

Can a surgeon do my biopsy instead?

For lumps near the surface — a breast lump or a neck lymph node you can feel — a surgical oncologist or breast surgeon may perform the biopsy, sometimes with ultrasound guidance. For anything deep inside the chest, abdomen or pelvis, an interventional radiologist is the right specialist, because imaging guidance is what makes reaching that location safely possible without opening the body. Your oncologist's referral will go to whoever is appropriate for your specific site.

What should I ask the radiologist before my biopsy?

Three questions are worth asking. First, how many procedures of this type — this organ, this approach — does this centre do each year, and who specifically will be performing yours. Second, whether the centre checks sample adequacy before the needle comes out, so you are not called back for a repeat. Third, what the plan is if the first attempt does not get enough tissue. You are entitled to clear answers to all three before you sign a consent form.

Will a doctor be in the room the whole time, or just a technician?

The interventional radiologist — a qualified doctor — should be present for the entire procedure. They insert the needle and take the samples. The radiographer or sonographer who operates the scanner is a trained technologist working under the radiologist's direct instruction, not independently. If you are told that a technician will be performing the biopsy without a doctor present, ask for clarification before you agree to proceed.

How do I know whether the centre doing my biopsy is experienced enough?

Ask directly. A centre that performs image-guided biopsies regularly will be able to tell you roughly how many procedures they do each year and will not be unsettled by the question. CIRSE guidance notes that operator volume is a meaningful factor in procedural competence. There is no single published Indian regulatory minimum for this procedure, but a centre that operates across multiple tumour sites and imaging modalities is a reasonable indicator of sustained practice.

Does the type of scanner used depend on the radiologist?

Mainly on the anatomy, not the radiologist's preference. Ultrasound is preferred when the tumour is clearly visible on it — it avoids radiation and provides real-time guidance without moving you. CT is used when the target is deep, obscured by bone or air, or not visible on ultrasound. MRI guidance is used in specific situations, including some prostate biopsies. The radiologist chooses based on your imaging and the location of the target, not on equipment availability alone.

Full index

Browse all 701 biopsy topics

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What Is a Biopsy?

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Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

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IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

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How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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