PET-CT Scan

1. What is a PET-CT Scan?

A PET-CT scan combines:

• Positron Emission Tomography (PET) – shows metabolic or functional activity in tissues.
• Computed Tomography (CT) – provides detailed anatomical images.

Together, these images help doctors identify abnormal areas and understand their location and activity more accurately.

2. When Is a PET-CT Scan Recommended?

PET-CT may be recommended for:

• Cancer diagnosis and staging
• Assessment of cancer spread
• Monitoring response to cancer treatment
• Detection of cancer recurrence
• Evaluation of certain lymphomas
• Selected neurological conditions
• Selected cardiac conditions
• Investigation of certain infections or inflammatory conditions

The appropriate PET tracer and scan protocol depend on the medical condition being evaluated.

3. How Should a Patient Prepare for a PET-CT Scan?

Preparation may include:

• Fasting for several hours before certain PET scans
• Drinking adequate water unless instructed otherwise
• Avoiding strenuous exercise before some examinations
• Checking blood glucose levels, particularly in diabetic patients
• Informing the medical team about pregnancy or breastfeeding
• Informing the centre about current medicines

Preparation instructions vary according to the PET tracer and type of scan.

4. What Does the PET-CT Scan Process Involve?

The general process includes:

Doctor's referral → Review of diagnosis and previous reports → Preparation instructions → Blood glucose check where required → Injection of PET tracer → Waiting period for tracer distribution → PET-CT imaging → Image processing → Specialist interpretation → Report

The scan is non-surgical and generally performed as an outpatient procedure.

5. What Types of PET-CT Scans Are Available?

Depending on the medical condition, PET-CT may use different radiotracers, including:

• FDG PET-CT – commonly used in oncology
• PSMA PET-CT – used in selected prostate cancer evaluations
• DOTATATE PET-CT – used for selected neuroendocrine tumours
• Other specialised tracers depending on clinical requirements

The doctor determines the appropriate scan and tracer.

6. How Long Does a PET-CT Scan Take?

The total visit commonly takes approximately 2–4 hours, depending on the tracer and protocol.

This may include:

• Preparation and registration
• Tracer injection
• Waiting period
• Image acquisition
• Recovery or observation where required

The actual scanning time is often shorter than the total visit.

7. What Are the Benefits of PET-CT?

PET-CT can help doctors:

• Detect areas of abnormal metabolic activity
• Stage many types of cancer
• Assess treatment response
• Identify possible cancer recurrence
• Guide biopsy or treatment planning
• Provide combined functional and anatomical information

Results must always be interpreted together with the patient's clinical history and other investigations.

8. Are There Any Risks or Side Effects?

PET-CT is generally considered a well-established diagnostic procedure. Considerations may include:

• Exposure to a small amount of radiation
• Discomfort from intravenous injection
• Rare reactions related to the tracer or contrast material where used
• Special considerations for pregnancy and breastfeeding
• Blood glucose-related preparation issues in diabetic patients

The imaging team will provide specific safety instructions.

9. Why Consider a PET-CT Scan in India?

India has advanced diagnostic and oncology centres offering:

• Modern PET-CT technology
• Experienced nuclear medicine specialists
• Different specialised PET tracers
• Oncology and multidisciplinary interpretation
• Integration with cancer treatment planning
• Competitive diagnostic costs

10. How Can Medavelle Help and What Should the Patient Do Next?

Medavelle can assist with:

Medical-record review → Specialist coordination → PET-CT centre selection → Appropriate scan and tracer planning → Appointment coordination → Cost estimation → International patient arrangements.

Next step: Share diagnosis & doctor's recommendation → Review previous imaging and medical reports → Confirm appropriate PET-CT protocol → Appointment planning → PET-CT scan → Specialist interpretation → Further treatment planning where required.

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