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Summary
• FDG-PET and CT are the prime imaging modalities in lung
cancer
• PET improves the accuracy of staging
– high negative predictive value for mediastinal lymph nodes
• More consistent contouring is possible with PET-CT
– volume may increase (include lymph nodes) and decrease (avoid
atalectasis)
– systematic approach to thresholding (e.q. source-to-background
ratio)
– validation with pathology is essential
• 4D imaging CT is required for precise delineation of the tumor
and characterizing the extent of motion
– Tumor motion is not detected directly; surrogates are used