PET-CT Scan

A PET/CT scan is performed to detect cancer, determine disease stage, evaluate treatment effectiveness, and identify cancer recurrence. It helps physicians visualize metabolic changes in cells before structural abnormalities appear, enabling earlier diagnosis. The scan also aids in diagnosing neurological disorders, cardiac conditions, and unexplained infections by revealing functional abnormalities.

A standalone PET scan shows only metabolic activity without precise anatomical localization, while a PET/CT scan combines metabolic PET imaging with structural CT imaging. The PET/CT fusion provides both functional information and exact anatomical location simultaneously, offering superior diagnostic accuracy. Most modern facilities exclusively use combined PET/CT technology for comprehensive evaluation.

Doctors recommend PET/CT scans when cancer is suspected, for accurate staging before treatment, monitoring therapy response, or detecting recurrence. It's particularly valuable for lymphoma, melanoma, colorectal, breast, and lung cancers. Physicians also order scans for unexplained neurological symptoms, cardiac viability assessment, or locating infection sources when conventional tests prove inconclusive.

Preparation requires fasting 4-6 hours beforehand, drinking only water. Avoid strenuous exercise 24 hours prior. Inform staff about diabetes, medications, pregnancy, or breastfeeding status. Wear metal-free, comfortable clothing. Diabetic patients need blood sugar monitoring and possible insulin adjustment. Your healthcare team provides specific instructions tailored to your medical situation.

The entire PET/CT scan appointment lasts approximately 2-3 hours. This includes tracer injection, a 45-60 minute uptake waiting period for tracer circulation, and 20-45 minutes of actual scanning time. The waiting period is essential for optimal tracer distribution. Some specialized scans may require additional time depending on areas being examined.

PET/CT scans are completely painless and non-invasive. You'll feel a small needle prick during tracer injection, similar to routine blood draws. Some patients experience minor discomfort from lying still during scanning or mild claustrophobia inside the scanner. The procedure involves no cutting, probing, or pain. Most patients find the experience tolerable and straightforward.

Yes, PET/CT scans are very safe for most patients. The radioactive tracer contains minimal radiation that decays rapidly and exits through urine. Total radiation exposure is comparable to or less than many standard CT scans. Serious complications are extremely rare. However, pregnant women should avoid scans, and breastfeeding mothers may need temporary feeding interruption.

PET/CT scans excel at detecting most cancers including lung, breast, colorectal, lymphoma, melanoma, and head-neck malignancies. They identify Alzheimer's disease, epilepsy, and brain disorders. Cardiac applications include detecting heart muscle damage and viability. Scans also locate infections, inflammatory conditions like sarcoidosis, and metastatic disease spread throughout the body with exceptional sensitivity.

Results typically take 1-3 business days after your scan. A specialized nuclear medicine physician or radiologist analyzes images and prepares a detailed report sent to your referring doctor. Your physician reviews findings and schedules a follow-up appointment to discuss results, explain implications, and recommend next steps. Emergency findings may be communicated sooner if critical.