Prostate cancer imaging
PSMA PET vs FDG PET — for Prostate Cancer
The standard PET tracer, FDG, routinely fails to detect prostate cancer. PSMA PET uses an entirely different target and finds disease that FDG cannot see. If your oncologist has recommended PSMA PET, there is a specific reason the standard scan would not answer the clinical question.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- FDG and prostate are a poor match — Prostate tumours consume very little glucose, so they produce little to no signal on a standard FDG scan.
- PSMA tracks a protein, not glucose — PSMA PET attaches to a protein expressed on prostate cancer cells — one that FDG ignores entirely.
- It detects disease earlier — PSMA PET can find spread at lower PSA levels and smaller tumour volumes than CT or bone scanning alone.
- Higher cost, targeted use — PSMA PET costs more than FDG PET but is ordered because the clinical question cannot be answered another way.
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FDG PET, the standard scanner used for most cancers, routinely misses prostate cancer because prostate tumours consume very little glucose — the signal FDG depends on. PSMA PET tracks a protein specific to prostate cancer cells and detects disease FDG cannot see. Your oncologist will recommend the right scan based on your PSA and treatment history.
At CION, a whole-body PET-CT starts from Rs 10,499 — among the lowest published prices in Hyderabad. Indicative price, as of September 2026.
Why does a standard PET scan miss prostate cancer?
FDG — fluorodeoxyglucose — is a radioactive sugar that concentrates in tissue with high glucose consumption. Most cancers burn large amounts of glucose, which is what makes them visible on an FDG scan.
Prostate cancer is a biological exception. Most prostate tumours consume very little glucose. They are present but produce almost no FDG signal, so the scan looks normal even when disease is there. This is not a limitation of the machine — it is a mismatch between the tracer and the tumour.
ASCO and ESMO guidance reflects this: FDG PET is generally not recommended for routine prostate cancer staging or recurrence assessment because the biology makes it unreliable for this tumour type.
What can PSMA PET detect that an FDG PET scan cannot?
- Lymph node spread that is too small to be called suspicious on a CT scan
- Bone metastases earlier than a standard bone scan typically finds them
- Biochemical recurrence — rising PSA after treatment — when CT and bone scan are both negative
- Small-volume disease in the pelvis after surgery or radiotherapy
- Distant spread that would change whether local salvage treatment is still appropriate
PET-CT Partner Centres
PET-CT Scan Centres in Hyderabad
CION offers PET-CT scans through 4 trusted partner PET-CT centres across Hyderabad, so you can choose the one closest to you. Call 18002028726 and we’ll guide you to the earliest available appointment.
PET-CT Centre — Punjagutta
PET-CT Centre — Himayatnagar
PET-CT Centre — Narayanaguda
These are partner diagnostic centres within the CION network. Toll-free booking: 18002028726.
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When would your oncologist choose PSMA PET instead of FDG PET?
PSMA PET is used most often in three situations: high-risk initial staging where knowing the true extent of disease changes the treatment plan, biochemical recurrence after surgery or radiotherapy where older imaging has found nothing, and assessment before PSMA-targeted therapy where confirming the tumour expresses the protein is required.
FDG PET is rarely used for prostate cancer at all. The exception is very aggressive or treatment-resistant disease that has shifted its metabolic pattern — your oncologist will tell you if that applies. For the vast majority of prostate cancer questions, FDG PET is not the right tool.
The decision about which scan you need is based on your PSA level, your Gleason score, what treatment you have already had, and what your oncologist is trying to find out. A scan is always ordered with a specific clinical question in mind.
What happens at your PSMA PET-CT appointment?
Booking
PSMA PET-CT is coordinated through partner imaging centres. Availability and tracer supply are confirmed at the time of booking — the radiotracer has a short usable life after production and cannot always be provided on the same day you call.
Preparation
Unlike FDG PET, PSMA PET does not require you to fast beforehand. Drink water normally and arrive hydrated. Your care team will tell you if any medications need to be paused.
Tracer injection
The PSMA tracer is given as a small injection into a vein. You will then wait approximately an hour in a quiet area while the tracer circulates and attaches to prostate cancer cells.
The scan
You lie still on the scanner bed for approximately 20 to 30 minutes. The scan is not painful. You may be asked to empty your bladder beforehand, as the tracer clears partly through the kidneys.
Results
Images are reported by a nuclear medicine physician. Your oncologist will discuss the findings with you at a follow-up appointment. The scan report describes what was seen — it does not itself determine your treatment.
PET-CT at CION starts from Rs 10,499 — among the lowest published prices in Hyderabad — across 4 partner centres in Banjara Hills, Punjagutta, Himayatnagar and Narayanaguda. Indicative price, as of September 2026.
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Common questions
Frequently asked questions
Is PSMA PET better than a bone scan for prostate cancer?
For detecting bone metastases, PSMA PET-CT is generally more sensitive than a standard bone scan, and it also assesses lymph nodes and soft tissue in the same examination — something a bone scan does not do. ASCO and ESMO guidance reflects this in high-risk staging and recurrence settings. Your oncologist will tell you which imaging your specific situation calls for, because the right choice depends on your stage, your PSA level, and what decision is being made about your treatment.
Does a negative PSMA PET mean the cancer has not spread?
No, and this is important to understand. A negative PSMA PET means the scan did not detect disease in visible locations at the time it was done. It does not confirm that no cancer cells are present elsewhere. Some spread may be below the resolution the scanner can detect. Your oncologist will interpret the result alongside your PSA trend and your clinical picture. A negative scan is useful information, but it is not a guarantee that the disease is confined.
Why does PSMA PET cost more than a standard FDG PET scan?
PSMA tracers are produced in specialist radiopharmacy facilities and have a short usable life after production, which makes supply and logistics more complex than FDG. The uptake wait time is also longer. At CION partner centres, the indicative cost for PSMA PET-CT is around ₹23,999 — this is a guide, and the confirmed figure should be verified at booking as costs may vary by centre or clinical requirements. Ask your care team for the actual amount before the appointment.
Can I have a PSMA PET if my PSA is very low after surgery?
Yes, and this is one of the situations where PSMA PET has changed clinical practice. It can detect recurrence at PSA levels where older imaging — CT and bone scan — showed nothing at all. Whether it is appropriate for your specific PSA level is a decision your oncologist makes based on your Gleason score, the treatment you received, and how rapidly your PSA is rising. Ask your oncologist what threshold they are using as the trigger for imaging in your case.
Does PSMA PET involve more radiation than a standard PET scan?
The radiation dose from a PSMA PET-CT is broadly comparable to an FDG PET-CT. Both involve a small radiotracer injection and the low-dose CT component. The dose is weighed against the clinical information the scan provides — that balance is part of the reason your oncologist orders it only when it will change what happens next. Your nuclear medicine team can give you the specific dose estimate for the scan you are having.
Will the PSMA PET scan tell my oncologist what treatment I need?
The scan tells your oncologist where disease is visible and how much the imaging can detect. It does not itself decide your treatment. Your oncologist uses the result alongside your PSA, your Gleason score, your general health, and your own priorities to recommend a plan. A scan that finds spread in one lymph node leads to a different conversation than one that finds many distant metastases — but the treatment decision is always made by your team in discussion with you, not by the scan alone.