PET Radioactive Tracers: A Patient's List of Common Tracers

PET imaging is no longer a one-size-fits-all modality. The right tracer for the clinical question can substantially affect what the scan finds. This guide catalogs the most common PET tracers, what each is used for, and where they are available.

What a Tracer Does

A PET tracer is a biological molecule with one atom replaced by a radioactive isotope. The molecule retains its normal biological behavior — it gets transported, metabolized, or bound by receptors just like the un-labeled version. The radioactive label allows the scanner to detect where the molecule accumulates.

Different tracers target different biology:
- FDG → glucose metabolism
- PSMA tracers → prostate cancer cell membrane antigen
- DOTATATE → somatostatin receptors on neuroendocrine cells
- FET → amino acid uptake in tumors
- Florbetaben → amyloid plaques in brain
- Na-F → bone metabolism
- Choline → cell membrane synthesis

Choosing the right tracer is choosing what biology to image.

F-18 FDG (Most Common, 110 min)

Fluorodeoxyglucose, glucose analog:

• Most widely used PET tracer worldwide (~95% of clinical PET)
• Detects high-glucose-use tissues (most cancers, inflammation, brain)
• Half-life 110 minutes allows central manufacturing and shipping
• Cost: $300–500 (US production cost); patient charge $3,500–6,500
• Universal availability

Best for: lymphoma, lung cancer, head and neck, esophageal, colorectal, melanoma staging, infection localization, sarcoidosis activity.

Limitations: prostate, renal cell, hepatocellular, mucinous, well-differentiated thyroid, well-differentiated NET — all FDG-low.

Ga-68 PSMA (68 min)

Gallium-68 PSMA-11, prostate cancer-specific:

• Targets prostate-specific membrane antigen
• 68-minute half-life requires onsite generator
• FDA approved in US since 2020
• Cost: $4,500–6,500 (US); ¥10,000–13,000 (China)

Best for: prostate cancer staging (especially intermediate to high-risk primary), biochemical recurrence, theranostic planning before Lu-177 PSMA.

F-18 DCFPyL (Newer PSMA)

PYLARIFY, F-18-labeled PSMA tracer:

• Same biology as Ga-68 PSMA but with longer F-18 half-life (110 min)
• FDA approved 2021
• Allows central production and shipping vs onsite generator
• Cost: $5,000–7,500 US; ¥10,000–15,000 China

Advantages: same sensitivity as Ga-68 PSMA, more accessible due to shippability.

Ga-68 DOTATATE (NETs)

DOTATATE somatostatin analog:

• Targets somatostatin receptor type 2 (SSTR-2) on neuroendocrine tumors
• FDA approved 2016
• Replaced older OctreoScan
• Half-life 68 minutes (Ga-68)
• F-18 Cu-64 DOTATATE variants under development

Best for: well-differentiated NET (carcinoid, pancreatic NET, GEP-NET), staging, restaging, theranostic planning for Lu-177 DOTATATE.

For selecting the right tracer in a NET workup, our team can help.

Carbon-11 Choline (Prostate Recurrence)

C-11 choline, cell membrane synthesis tracer:

• 20-minute half-life — must be used within ~1 hour of production
• Requires nearby cyclotron
• Older tracer; largely replaced by PSMA imaging where available
• Cost: $4,000–6,500 US; ¥8,000–12,000 China

Best for: prostate cancer biochemical recurrence (especially at low PSA). Now usually second-choice after PSMA.

Na-F (Bone), FET (Brain Tumor)

Na-F (sodium fluoride PET):
- Bone metabolism tracer
- 110-min half-life
- More sensitive than traditional Tc-99m bone scan
- Cost: $2,500–4,500 US; ¥4,500–7,500 China
- Best for: bone metastases detection, focal bone lesion characterization

F-18 FET (fluoroethyltyrosine):
- Amino acid uptake tracer
- 110-min half-life
- Best for: brain tumor recurrence vs radiation necrosis
- More common in Europe and China than US (research-only in many US centers)
- Cost: $4,500–6,000 US; ¥8,000–12,000 China

Other Emerging Tracers

A growing menu of specialized tracers:

Tracer	Target	Application
F-18 Florbetaben / Florbetapir / Flutemetamol	Amyloid plaques	Alzheimer's disease
F-18 Flortaucipir	Tau tangles	Alzheimer's, dementia
F-18 DOPA	Dopamine synthesis	Parkinsonism, brain tumors
F-18 FAPI	Tumor stroma	Pan-cancer (emerging)
Cu-64 DOTATATE	SSTR-2	NET (longer half-life than Ga-68)
F-18 Fluciclovine (Axumin)	Amino acid	Prostate cancer recurrence
F-18 FDOPA	Dopamine synthesis	Brain tumors, NET
Cu-67/Lu-177/Ac-225 PSMA	PSMA	Theranostic treatment of prostate cancer

The field is expanding rapidly. Centers serving international patients increasingly offer specialized tracer access for complex cases.

Need Help Booking?

SinoCareLink can pre-book any PET tracer scan at a top Chinese hospital with full PET pharmacy, translate reports into English, and arrange airport pickup. Contact us for a free consultation.