1800 202 8726
Image-guided biopsy

PET-Guided and — Fusion Biopsy

A fusion biopsy joins two sets of imaging — a PET scan taken before your procedure and a live scan taken in the procedure room — so the needle reaches the part of the tumour that is working hardest. If you have wondered why a scanner is involved in a needle test, this is why.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

  • The scanner guides the needle — Fusion imaging overlays your PET scan onto a live image so the needle reaches the most active zone, not just the visible mass.
  • It targets the biologically active part — Different zones of the same tumour can behave differently. The PET scan identifies which zone is most informative to sample.
  • Used when a standard biopsy has not given a result — Fusion guidance is particularly useful when a lesion has uneven activity or a previous biopsy was inconclusive.
  • PET imaging coordinated at CION — PET-CT is arranged through partner imaging centres. Your biopsy team works from those images to plan and guide the procedure.
4.8 · 800+ Google reviews · 15,000+ patients treated
Limited Slots Today

Get this explained properly

₹950   Today: FREE  ·  Including free written second opinion

Reply within 2 working hours
Report reviewed by a senior oncologist
Confidential. No commitment to start treatment.
or
Call 1800 202 8726
17+
Cancer Specialists
on Panel
96.9%
Breast Cancer
Survival Rate*
15,000+
Patients
Treated
4.8★
Google Rating
(800+ reviews)

A PET-guided fusion biopsy overlays your PET scan onto a live ultrasound or CT image during the procedure, so the needle targets the most metabolically active part of the tumour. That zone is the most informative for the laboratory. The technique is used when a lesion has uneven activity or a standard biopsy has not given a result.

What does fusion guidance mean in a biopsy?

Fusion guidance
A technique that aligns a previously taken PET image with the live scan used during the biopsy. The overlay lets the doctor see the metabolically active zone on the live image in real time, while placing the needle.
PET scan
A scan that shows which parts of your body are using the most glucose — a sign of high metabolic activity. Areas that light up brightly on PET are often the most biologically active parts of a lesion.
Metabolically active
Tissue consuming energy at a high rate. In a tumour, this usually means actively dividing cells. Sampling from the most metabolically active zone gives the pathologist the most representative tissue.
SUV (standardised uptake value)
A number in your PET scan report indicating how much tracer a particular area absorbed. A higher number points to higher activity. Your biopsy team uses this to identify and confirm the target zone.
Tracer
A mildly radioactive substance — most commonly FDG, a form of glucose — injected before a PET scan. It accumulates in areas of high metabolic activity, making them visible on the scan.

When is a PET-guided fusion biopsy recommended?

  • Your PET scan shows that different parts of the same lesion have very different activity levels.
  • A previous biopsy came back inconclusive or did not give a usable result.
  • Your oncologist needs tissue from a specific zone within the lesion, not just the overall mass.
  • The most active part of the tumour is deep or positioned in a way that needs precise imaging guidance to reach.
  • Your team needs to assess whether different zones of the lesion are responding differently to treatment.

Still unclear?

Send your reports across and a specialist will walk you through what they mean — what is known, what is not, and what the options actually are.

Meet the Specialists

17+ senior cancer specialists. One panel for your case.

Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.

Dr. Naresh Gundu
Medical Oncologist

Dr. Naresh Gundu

MBBS, DNB (Internal Medicine), DM (Medical Oncology)

View Profile
Dr. C. Raghavendra Reddy
Medical Oncologist

Dr. C. Raghavendra Reddy

MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)

View Profile
Dr. Bharati Devi Gorantla
Medical Oncologist

Dr. Bharati Devi Gorantla

MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)

View Profile
Dr. Owais Mohammed
Medical Oncologist

Dr. Owais Mohammed

MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)

View Profile
Dr. T. Raghavender Reddy
Medical Oncologist

Dr. T. Raghavender Reddy

MBBS, DM (Medical Oncology), MD (Radiation Oncology)

View Profile
Dr. N. Kiranmayee
Medical Oncologist

Dr. N. Kiranmayee

MBBS, DM (Medical Oncology), MD (Internal Medicine)

View Profile
Dr. Muralidhar Muddusetty
Surgical Oncologist

Dr. Muralidhar Muddusetty

MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)

View Profile
Dr. Raghavendra Naik
Surgical Oncologist

Dr. Raghavendra Naik

MBBS, MS (General Surgery), M.Ch (Surgical Oncology)

View Profile
Dr. Mohammed  Imaduddin
Surgical Oncologist

Dr. Mohammed Imaduddin

M.B.B.S, MS (General Surgery), M.Ch (Surgical Oncology)

View Profile
Dr. Vinay Mamidala
Surgical Oncologist

Dr. Vinay Mamidala

MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)

View Profile
Dr. Paila Gowri Naidu
Surgical Oncologist

Dr. Paila Gowri Naidu

MBBS, MS (General Surgery), M.Ch (Surgical Oncology), FMAS

View Profile
Dr. Venkata Sushma P
Radiation Oncologist

Dr. Venkata Sushma P

MBBS, MD (Radiation Oncology)

View Profile
Dr. Kirti Ranjan Mohanty
Radiation Oncologist

Dr. Kirti Ranjan Mohanty

MBBS, MD (Radiation Oncology)

View Profile
Dr. Gangadhar Vajrala
Radiation Oncologist

Dr. Gangadhar Vajrala

MBBS, MD (Radiation Oncology), MPH

View Profile
Dr. Basudev Pokhrel
Hematologist

Dr. Basudev Pokhrel

MBBS, M.D (Immunohematology & Blood Transfusion)

View Profile
Dr. Mohammed Imran
Interventional Radiologist

Dr. Mohammed Imran

View Profile
Dr. Vajja Sandeep Kumar
Surgical Oncologist

Dr. Vajja Sandeep Kumar

MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology

View Profile
Dr. Sridhar Kamani
Surgical Oncologist

Dr. Sridhar Kamani

MBBS, MS (General Surgery), DrNB (Surgical Oncology)

View Profile

Want a specific doctor for your case? Mention them when booking.

Book Free Consultation

Get a straight answer from a specialist

45 minutes, your reports reviewed, your questions answered in plain language.

Book Free Consultation Call 1800 202 8726

Why does it matter which part of the tumour the needle targets?

The most active zone of a tumour gives the pathologist the most representative tissue. A single mass can contain zones of actively dividing cells, areas responding to treatment, and areas of dead tissue (necrosis) that no longer reflect what the disease is currently doing.

A needle placed in a necrotic or inactive area may return tissue that does not reflect the live disease. The pathology result can appear inconclusive — even when active disease is present elsewhere in the same mass.

The PET scan identifies the zone consuming the most energy. Biopsying from there gives the pathologist tissue that is representative of the most biologically significant part of the lesion.

How does fusion guidance work — and is it available at CION?

Fusion guidance software aligns your previously taken PET images with the live scan used during the biopsy — typically ultrasound or CT. The two image sets are registered to each other so the PET-active zone appears as an overlay on the live image.

During the procedure, the doctor sees both at once: the live anatomy and the marker showing where the active area is. The needle is directed to that target.

At CION, PET-CT imaging is coordinated with partner imaging centres. Your biopsy team reviews those images to plan the procedure and direct needle placement. Ask your oncologist whether this approach is appropriate for your specific lesion and at which centre it is carried out.

Did you know?

A single tumour can contain multiple distinct biological zones. PET imaging can reveal that the most metabolically active area is smaller, deeper, or differently positioned than the overall mass appears on a standard CT — which is why the two scans carry different, complementary information.

This is the reason fusion guidance was developed: to bring that PET information into the procedure room.

Source: EANM position paper on PET/CT-guided interventions in oncology

Explore 62 more Biopsy Techniques and How They Compare topics

All Biopsy Techniques and How They Compare →

Next step

Still not sure what applies to you?

Send your reports across and a senior medical oncologist will go through what they mean, what is known, and what the options actually are.

Book Free Consultation Call 1800 202 8726
Common questions

Frequently asked questions

What is the difference between a standard biopsy and a fusion biopsy?

A standard image-guided biopsy uses ultrasound or CT alone to navigate to a visible mass and take tissue from it. A fusion biopsy adds the PET scan layer so the needle reaches the part of that mass that is metabolically most active — not just the mass as a whole. The practical difference is where within the lesion the tissue comes from, which matters when different zones of the same tumour have different biology.

Will I need a new PET scan before the fusion biopsy?

Not always. If a recent PET scan already shows the lesion clearly, the imaging team will work from that. If the scan is old or does not show the lesion with enough detail to plan from, your oncologist may request an updated one. The decision depends on how recent the existing scan is, whether the lesion has changed, and whether the image quality is sufficient for fusion registration.

Does fusion guidance make the biopsy more painful or take longer?

The fusion step happens in the planning and imaging software — it is not a separate physical step that affects what you feel. The biopsy itself, including how many samples are taken and the local anaesthetic, is determined by the lesion location and your clinical situation, not by whether fusion guidance was used.

Is there extra radiation from a PET-guided biopsy?

The biopsy needle itself does not produce radiation. If CT is used during the procedure to guide the needle, a dose is involved. ICRP guidance describes CT-guided procedures as carrying a dose comparable to other diagnostic CT examinations, considered acceptable against the clinical benefit. Your PET scan was done separately before the procedure. If you have a specific concern, raise it with your oncologist or the radiologist beforehand.

What happens if the result is still inconclusive after a fusion biopsy?

An inconclusive result may prompt a discussion about whether a repeat biopsy from a different zone is worthwhile, whether additional molecular testing can be done on the existing sample, or whether another diagnostic approach is more suitable. Your oncologist will explain what was obtained, what is still needed, and what the next step is. An inconclusive result is information about what the test found — not a final verdict on what the disease is doing.

How do I know if my biopsy used PET fusion guidance?

Your biopsy report and procedure note in your medical record will describe the imaging guidance used. If the PET scan was used to direct the needle, this should be documented. If you are unsure, ask your oncologist directly — they can tell you which imaging guided the needle and what the planned target zone was.

Full index

Browse all 701 biopsy topics

Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

What Is a Biopsy? Everything You Need to Know →

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

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

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

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

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 →

Call now Book free consultation